Space & Astronomy/Space and Astronomy (October 1993).iso/mac/TEXT/SPACEDIG/V15_3/V15NO366.TXT

Internet Message Format | 1993-07-13 | 44KB

Date: Mon,  2 Nov 92 05:04:44
From: Space Digest maintainer <[e-mail]>
Reply-To: [e-mail]
Subject: Space Digest V15 #366
To: Space Digest Readers
Precedence: bulk


Space Digest                Mon,  2 Nov 92       Volume 15 : Issue 366

Today's Topics:
                 Space FAQ 02/15 - Network Resources
                    Space FAQ 03/15 - Data Sources
                    Space FAQ 04/15 - Calculations

    Welcome to the Space Digest!!  Please send your messages to
    "[e-mail]", and (un)subscription requests of the form
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    (BITNET), rice::boyle (SPAN/NSInet), utadnx::utspan::rice::boyle
    (THENET), or [e-mail] (Internet).
----------------------------------------------------------------------

Date: 1 Nov 92 18:13:48 GMT
From: Jon Leech <[e-mail]>
Subject: Space FAQ 02/15 - Network Resources
Newsgroups: sci.astro,sci.space,news.answers

Archive-name: space/net
Last-modified: $Date: 92/10/31 17:37:54 $

NETWORK RESOURCES

OVERVIEW

    You may be reading this document on any one of an amazing variety of
    computers, so much of the material below may not apply to you. In
    general, however, systems connected to 'the net' fall in one of three
    categories: Internet, Usenet, or BITNET. Electronic mail may be sent
    between these networks, and other resources available on one of these
    networks are sometimes accessible from other networks by email sent to
    special 'servers'.

    The space and astronomy discussion groups actually are composed of
    several mechanisms with (mostly) transparent connections between them.

    One mechanism is the mailing list, in which mail is sent to a central
    distribution point which relays it to all recipients of the list. In
    addition to the general lists for space (called SPACE Digest for
    Internet users, and SPACE on BITNET), there are a number of more
    specialized mailing lists described below.

    A second mechanism is Usenet 'netnews'. This is somewhat like a bulletin
    board operating on each system which is a part of the net. Netnews
    separates contributions into hundreds of different categories based on a
    'group name'. The groups dealing most closely with space topics are
    called 'sci.space.news', 'sci.space', 'sci.space.shuttle', 'sci.astro',
    and 'talk.politics.space'. Contributors 'post' submissions (called
    'articles' in netnews terminology) on their local machine, which sends
    it to other nearby machines. Similarly, articles sent from nearby
    machines are stored locally and may be forwarded to other systems, so
    that an article is posted locally and eventually reaches all the Usenet
    sites interested in receiving the news group to which the article was
    posted.

    Gateway machines redirect the Usenet sci.space group into Internet and
    BITNET mailing lists and vice versa; the other Usenet groups are not
    accessible as mailing lists. If you can receive netnews, its more
    flexible interface and access to a wider range of material usually make
    it the preferred option.

MAILING LISTS

    SPACE Digest is the main Internet list, and is now being run by the
    International Space University (in only its second change of management
    in over a decade). Email [e-mail] (message body
    should be in the format 'subscribe space John Public') to join. Note
    that the moderated SPACE Magazine list is defunct at present for lack of
    a moderator. Old copies of SPACE Digest since its inception in 1981 are
    available by anonymous FTP. Retrieve
    julius.cs.qub.ac.uk:pub/SpaceDigestArchive/README
    for further details.

    Elements is a moderated list for fast distribution of Space Shuttle
    Keplerian Elements before and during Shuttle flights. NASA two line
    elements are sent out on the list from Dr. Kelso, JSC, and other sources
    as they are released. Email to [e-mail] to join.

    Space-investors is a list for information relevant to investing in
    space-related companies. Email Vincent Cate ([e-mail]) to join.

    Space-tech is a list for more technical discussion of space topics;
    discussion has included esoteric propulsion technologies, asteroid
    capture, starflight, orbital debris removal, etc. Email to
    [e-mail] to join. Archives of old digests and
    selected excerpts are available by anonymous FTP from
    daisy.learning.cs.cmu.edu (128.2.218.26) in /usr/anon/public/space-tech,
    or by email to space-tech-request if you don't have FTP access.

    SEDS-L is a BITNET list for members of Students for the Exploration and
    Development of Space and other interested parties. Email
    [e-mail] with a message saying "SUBSCRIBE SEDS-L your
    name". Email saying "INDEX SEDS-L" to list the archive contents.

    SEDSNEWS is a BITNET list for news items, press releases, shuttle status
    reports, and the like. This duplicates material which is also found in
    Space Digest, sci.space, sci.space.shuttle, and sci.astro. Email
    [e-mail] saying "SUBSCRIBE SEDSNEWS your name" to join.
    Email saying "INDEX SEDSNEWS" to list the archive contents.

    Ron Baalke ([e-mail]) runs a mailing list which
    carries the contents of the sci.space.news Usenet group. Email him
    to join the list.

    As a general note, please mail to the *request* address to get off a
    mailing list. SPACE Digest, for example, relays many inappropriate
    'please remove me from this list' messages which are sent to the list
    address rather than the request address.

PERIODICALLY UPDATED INFORMATION

    In addition to this FAQ list, a broad variety of topical information is
    posted to the net (unless otherwise noted, in the new group
    sci.space.news created for this purpose). Please remember that the
    individuals posting this information are performing a service for all
    net readers, and don't take up their time with frivolous requests.

    ACRONYMS
    Garrett Wollman ([e-mail]) posts an acronym list around the
    first of each month.

    ASTRO-FTP LIST
    Veikko Makela ([e-mail]) posts a monthly list of
    anonymous FTP servers containing astronomy and space related
    material to sci.space and sci.astro.

    AVIATION WEEK
    Henry Spencer ([e-mail]) posts summaries of
    space-related stories in the weekly _Aviation Week and Space
    Technology_.

    BUYING TELESCOPES
    Ronnie Kon ([e-mail]) posts a guide to buying telescopes to
    sci.astro.

    ELECTRONIC JOURNAL OF THE ASA
    Don Barry ([e-mail]) posts the monthly Electronic Journal
    of the Astronomical Society of the Atlantic to sci.astro.

    FLIGHT INTERNATIONAL
    Swaraj Jeyasingh ([e-mail]) posts summaries of
    space-related news from _Flight International_. This focuses more on
    non-US space activities than Aviation Week.

    LARGE ASTRONOMICAL PROJECTS
    Robert Bunge ([e-mail]) posts a list describing many
    "Large Telescope Projects Either Being Considered or in the Works"
    to sci.astro.

    NASA HEADLINE NEWS & SHUTTLE REPORTS
    Peter Yee ([e-mail]) posts a variety of NASA material,
    including NASA Headline News (with the schedule for NASA SELECT),
    shuttle payload briefings and flight manifests, and KSC shuttle
    status reports. For Usenet users, much of this material appears in
    the group sci.space.shuttle.

    NASA UPDATES
    Ron Baalke ([e-mail]) posts frequent updates from
    JPL, Ames, and other centers on the Ulysses, Gailileo, Pioneer,
    Magellan, Landsat, and other missions.

    ORBITAL ELEMENT SETS
    TS Kelso ([e-mail]) posts orbital elements from
    NASA Prediction Bulletins.

    Mike Rose ([e-mail]) posts orbital elements for the Hubble
    Space Telescope to sci.astro.

    Jost Jahn ([e-mail]) posts ephemerides for asteroids,
    comets, conjunctions, and encounters to sci.astro.

    SATELLITE LAUNCHES
    Richard Langley ([e-mail]) posts SPACEWARN Bulletin, which
    describes recent launch/orbital decay information and satellites
    which are useful for scientific activities. Recent bulletins are
    available by anonymous FTP from nssdca.gsfc.nasa.gov in
    ANON_DIR:[000000.ACTIVE.SPX].

    SHUTTLE MANIFEST
    Ken Hollis ([e-mail]) posts a compressed version
    of the Space Shuttle launch manifest to sci.space.shuttle. This
    includes dates, times, payloads, and information on how to see
    launches and landings.

    SOLAR ACTIVITY
    Cary Oler ([e-mail]) posts Solar Terrestrial reports
    (describing solar activity and its effect on the Earth) to

    sci.space. The report is issued in part from data released by the
    Space Enviroment Services Center, Boulder Colorado. The intro
    document needed to understand these reports is available by
    anonymous FTP from solar.stanford.edu (36.10.0.4) in
    pub/understanding_solar_terrestrial_reports. nic.funet.fi
    (128.214.6.100) also has this document in
    /pub/misc/rec.radio.shortwave/solarreports and is an archive site
    for the reports (please note this site is in Europe, and the
    connection to the US is only 56KB). A new primary archive site,
    xi.uleth.ca (142.66.3.29), has recently been established and will be
    actively supported.

    SOVIET SPACE ACTIVITIES
    Glenn Chapman ([e-mail]) posts summaries of Soviet space
    activities.

    SPACE ACTIVIST NEWSLETTER
    Allen Sherzer ([e-mail]) posts a newsletter, "One Small Step for
    a Space Activist," to talk.politics.space. It describes current
    legislative activity affecting NASA and commercial space activities.

    SPACE EVENTS CALENDAR
    Ron Baalke ([e-mail]) posts a calendar including
    anniversaries, conferences, launch dates, meteor showers and
    eclipses, and other space-related events.

    SPACE NEWS
    John Magliacane ([e-mail]) posts "SpaceNews" (covering
    AMSATs, NOAA and other weather satellites, and other ham
    information) to rec.radio.amateur.misc and sci.space.

    SPACE REPORT
    Jonathan McDowell ([e-mail]) posts "Jonathan's Space
    Report" covering launches, landings, reentries, status reports,
    satellite activities, etc.

    TOWARD 2001
    Bev Freed ([e-mail]) posts "Toward 2001", a weekly
    global news summary reprinted from _Space Calendar_ magazine.


WARNING ABOUT NON-PUBLIC NETWORKS

    (Included at the suggestion of Eugene Miya, who wrote the item)

    NASA has an internal system of unclassified electronic mail and bulletin
    boards. This system is not open for public use. Specifically, NASA
    personnel and procurement operations are regarded with some sensitivity.
    Contractors must renegotiate their contracts. The Fair and Open
    Procurement Act does not look kindly to those having inside information.
    Contractors and outsiders caught using this type of information can
    expect severe penalities. Unauthorized access attempts may subject you
    to a fine and/or imprisonment in accordance with Title 18, USC, Section
    1030. If in fact you should should learn of unauthorized access, contact
    NASA personnel.


NEXT: FAQ #3/15 - Online (and some offline) sources of images, data, etc.

------------------------------

Date: 1 Nov 92 18:14:23 GMT
From: Jon Leech <[e-mail]>
Subject: Space FAQ 03/15 - Data Sources
Newsgroups: sci.astro,sci.space,news.answers

Archive-name: space/data
Last-modified: $Date: 92/10/31 17:37:44 $

ONLINE AND OTHER SOURCES OF IMAGES, DATA, ETC.


INTRODUCTION

    A wide variety of images, data, catalogs, information releases, and
    other material dealing with space and astronomy may be found on the net.
    A few sites offer direct dialup access or remote login access, while the
    remainder support some form of file transfer. Many sites are listed as
    providing 'anonymous FTP'. This refers to the File Transfer Protocol on
    the Internet. Sites not connected to the Internet cannot use FTP
    directly, but there are a few automated FTP servers which operates via
    email. Send mail containing only the word HELP to [e-mail]
    or [e-mail], and the servers will send you instructions
    on how to make requests.

    The sources with the broadest selection of material are the NASA Ames
    SPACE archive and the National Space Science Data Center.

    Don't even ask for images to be posted to the net. The data volume is
    huge and nobody wants to spend the time on it.


VIEWING IMAGES

    The possible combinations of image formats and machines is forebodingly
    large, and I won't attempt to cover common formats (GIF, etc.) here. To
    read PDS and VICAR (and many other) formats on Unix systems running X,
    use XV 2.11, available by anonymous FTP from export.lcs.mit.edu
    (18.24.0.12) in contrib/xv-2.11.tar.Z and the other standard X11 FTP
    sites.

    The FAQ for the Usenet group alt.binaries.pictures discusses image
    formats and how to get image viewing software. A copy of this document
    is available by anonymous FTP from the Usenet FAQ archives at
    pit-manager.mit.edu (18.72.1.58), in directory
    pub/usenet/alt.binaries.pictures.


ONLINE ARCHIVES

    NASA AMES

    Extensive archives are maintained at NASA Ames and are available via
    anonymous FTP or an email server. These archives include many images and
    a wide variety of documents including this FAQ list, NASA press
    releases, shuttle launch advisories, and mission status reports. Please
    note that these are NOT maintained on an official basis.

    FTP users should connect to ames.arc.nasa.gov (128.102.18.3) and look in
    pub/SPACE. pub/SPACE/Index contains a listing of files available in the
    archive (the index is about 200K by itself).

    To access the archives by email, send a letter to
    [e-mail] (or ames!archive-server). In the
    subject of your letter (or in the body), use commands like:

    send SPACE Index
    send SPACE SHUTTLE/ss01.23.91.

    The capitalization of the subdirectory names is important. All are in
    caps. Only text files are handled by the email server at present; use
    one of the FTP email servers described in the introduction to this
    section for images or programs.

    The Magellan Venus and Voyager Jupiter, Saturn, and Uranus CD-ROM image
    disks have been put online in the CDROM and CDROM2 directories. The
    disks will be rotated on a weekly basis. Thousands of images are
    available in these collections.

    The GIF directory contains images in GIF format. The VICAR directory
    contains Magellan images in VICAR format (these are also available in
    the GIF directory). A PC program capable of displaying these files is
    found in the IMDISP directory (see the item "VIEWING IMAGES" below).

    The NASA media guide describes the various NASA centers and how to
    contact their public affairs officers; this may be useful when pursuing
    specific information. It's in MISC/media.guide.

    Any problems with the archive server should be reported to Peter Yee
    ([e-mail]).


    NASA SPACELINK

    SpaceLink is an online service located at Marshall Space Flight Center
    in Huntsville, Alabama. The system is specifically designed for
    teachers. The data base is arranged to provide easy access to current
    and historical information on NASA aeronautics, space research, and
    technology transfer information. Also included are suggested classroom
    activities that incorporate information on NASA projects to teach a
    number of scientific principles. Unlike bulletin board systems, NASA
    Spacelink does not provide for interaction between callers. However it
    does allow teachers and other callers to leave questions and comments
    for NASA which may be answered by regular mail. Messages are answered
    electronically, even to acknowledge requests which will be fulfilled by
    mail. Messages are generally handled the next working day except during
    missions when turnaround times increase. The mail system is closed- loop
    between the user and NASA.

    SpaceLink also offers downloadable shareware and public domain programs
    useful for science educators as well as space graphics and GIF images
    from NASA's planetary probes and the Hubble Telescope.

    You can dial in at (205)-895-0028 (300/1200/2400/9600(V.32) baud, 8
    bits, no parity, 1 stop bit), or telnet to spacelink.msfc.nasa.gov
    (128.158.13.250, also known as xsl.msfc.nasa.gov) if you're on the
    Internet. Anonymous FTP capability will be offered in the future.

    Most of this information is also available from the Ames server in
    directory SPACELINK.


    NATIONAL SPACE SCIENCE DATA CENTER (NSSDC)

    The National Space Science Data Center is the official clearinghouse for
    NASA data. The data catalog (*not* the data itself) is available online.
    Internet users can telnet to nssdca.gsfc.nasa.gov (128.183.36.23) and
    log in as 'NODIS' (no password). You can also get the catalog by sending
    email to '[e-mail]'.

    You can also dial in at (301)-286-9000 (300, 1200, or 2400 baud, 8 bits,
    no parity, one stop). At the "Enter Number:" prompt, enter MD and
    carriage return. When the system responds "Call Complete," enter a few
    more carriage returns to get the "Username:" and log in as 'NODIS' (no
    password).

    The system is menu-driven; topics available as of 4/10/92 are:

    1   -    Master Directory - NASA & Global Change
    2   -    Personnel Information Management System
    3   -    Nimbus-7 GRID TOMS Data
    4   -    Interplanetary Medium Data (OMNI)
    5   -    Request data and/or information from NSSDC
    6   -    Geophysical Models
    7   -    CANOPUS Newsletter
    8   -    International Ultraviolet Explorer Data Request
    9   -    CZCS Browse and Order Utility
    10  -    Astronomical Data Center (ADC)
    11  -    STEP Bulletin Board Service
    12  -    Standards and Technology Information System

    Data can be ordered from the NSSDC on CD-ROM and other formats. Among
    the many types of data available are Voyager, Magellan, and other
    planetary images, Earth observation data, and star catalogs. Viewers for
    Macintosh and IBM systems are also available. As an example of the cost,
    an 8 CD set of Voyager images is $75. Data may ordered online, by email,
    or by physical mail. The postal address is:

    National Space Science Data Center
    Request Coordination Office
    Goddard Space Flight Center
    Code 633
    Greenbelt, MD  20771

    Telephone: [phone]

    Email address:     [e-mail]

    NSSDCA is also an anonymous FTP site, but no comprehensive list of
    what's there is available at present.


    SPACE AND PLANETARY IMAGE FACILITY

    Available 24 hours a day via anonymous FTP from pioneer.unm.edu. Has
    approximately 150 CD-ROM's full of imagery, raw, and tabular data. To
    start, get the file:

    pioneer.unm.edu:pub/info/beginner-info

    This will hopefully give you all of the information you need to get data
    from their machine. beginner-info has been translated to other
    languages, you should look inside pub/info for the particular language
    that meets your needs.

    Contact [e-mail].


    SPACE TELESCOPE SCIENCE INSTITUTE ELECTRONIC INFORMATION SERVICE

    stsci.edu (130.167.1.2) has a large amount of information about the
    Hubble Space Telescope available by anonymous FTP, such as status
    reports and newsletters, in addition to material oriented towards HST
    observers and proposers. Get the top level README file to begin with.
    Contact Pete Reppert ([e-mail]) or Chris O'Dea
    ([e-mail]).


    ASTRONOMICAL DATABASES

    The full SAO stellar database is *NOT* available online, probably due to
    the 40 MB size. It may be ordered on magnetic tape from the NSSDC. A
    subset containing position and magnitude only is available by FTP (see
    "Astronomy Programs" below).

    nic.funet.fi (128.214.6.100) has a large collection of astronomical
    programs for many types of computers, databases of stars and deep sky
    objects, and general astronomy information in directory /pub/astro. This
    site is mainly for European users, but overseas connections are
    possible.

    mandarin.mit.edu (18.82.0.21) has the following data available via
    anonymous FTP in directory /astro: StarChart v3.2, orbital elements for
    bright comets and asteroids, the Yale Bright Star catalog, Saguaro
    Astronomy Club Deepsky and Double Star databases, some PC astronomy
    programs, and possibly more. Get astro/README. Contact
    [e-mail] with questions.

    The Ames archives contain a database of 8,436 galaxies including name,
    RA, declination, magnitude, and radial velocity in MISC/galaxy.dat.
    Supplied by Wayne Hayes ([e-mail]).

    iris1.ucis.dal.ca (129.173.18.107) has a number of GIFs from Voyager,
    Hubble, and other sources available by anonymous FTP in pub/gif (most of
    this data is also in SPACE/GIF on the Ames server). Please restrict
    access to 5pm - 8am Atlantic time.

    pomona.claremont.edu has the Yale Bright Star catalog for anonymous FTP
    in directory [.YALE_BSC]. Contact James Dishaw
    ([e-mail]).

    The Hubble Guide Star catalog is available on CD-ROM for the Mac and PC
    for $49.95 US (catalog # ST101).

    Astronomical Society of the Pacific
    390 Ashton Ave.
    San Francisco, CA 94112
    Phone: [phone] AM - 3 PM Pacific Time
    FAX: [phone]

    For German (and possibly other European) readers, Jost Jahn has a
    service to distribute astronomical data to interested amateurs at cost.
    About 30-40 catalogs are available for DM 6..8/disk. Several floppy disk
    formats are available. Because of the expense of receiving email on his
    system, he asks that you contact him by physical mail:

    Jost Jahn
    Neustaedter Strasse 11
    W-3123 Bodenteich
    GERMANY
    Phone: FRG-5824-3197


    ASTRONOMY PROGRAMS

    Various astronomy-related programs and databases posted to the net in
    the past are archived for anonymous FTP at multiple sites, including
    ftp.uu.net (137.39.1.9). Also see the ASTRO-FTP list posted to sci.astro
    monthly, which is more complete than this list.

    Astonomical/Space-related sources of interest in comp.sources.unix:

    Volume 8:        phoon    moon phase and date routines
    Volume 12,13:   starchart    starchart program & Yale Star data
    Volume 15:        moontool    shows moon phase picture on Suns
    Volume 16:        sao        reduced SAO catalog

    Astonomical/Space-related sources of interest in comp.sources.misc:

    Volume  8:        moon    another moon phase program
    Volume 11:        starchart    starchart program, version 3.2
    Volume 11:        n3emo-orbit orbit: track earth satellites
    Volume 12:        starchart2    starchart program, update to version 3.2.1
    Volume 13:        jupmoons    plotter for Jupiter's major moons [in perl]
    Volume 13:        lunisolar    lunisolar (not sure what this does)
    Volume 14:        ephem-4.21    astronomical ephemeris, v4.21
    Volume 14:        n3emo-orbit patch to orbit 3.7
    Volume 18:        planet    planet generation simulator

    Elwood Downey ([e-mail]), the author of
    "ephem", has offered to mail copies to people who can't find it on one
    of the archives.

    XSAT, an X Window System based satellite tracking program, is
    available by anonymous FTP from export.lcs.mit.edu (18.24.0.12) in
    contrib/xsat1.0.tar.Z. Contact Dave Curry ([e-mail])
    for more information.

    Xsky, a computerized sky atlas for the X Window System, is available for
    anonymous FTP on arizona.edu in the directory [.SOFTWARE.UNIX.XSKY] as
    xsky.tarz. Contact Terry R. Friedrichsen ([e-mail]) for
    more information.

    The "Variable Stars Analysis Software Archive" is available via
    anonymous FTP from kauri.vuw.ac.nz (130.195.11.3) in directory
    pub/astrophys. This is intended for specialists in this field, and they
    would appreciate people from outside New Zealand confining their FTP
    access to the astrophys directory, as they pay a significant amount for
    Internet access. Contents are relatively sparse at present due to the
    youth of the archive - contributions are encouraged. Contact the archive
    administrator, Timothy Banks ([e-mail]) for more
    information.

    The "IDL Astronomy Users Library" is available by anonymous FTP from
    idlastro.gsfc.nasa.gov (128.183.57.82). This is a central repository for
    general purpose astronomy procedures written in IDL, a commercial image
    processing, plotting, and programming language. Contact Wayne Landsman
    ([e-mail]) for more information.


    ORBITAL ELEMENT SETS

    The most recent orbital elements from the NASA Prediction Bulletins are
    carried on the Celestial BBS, (513)-427-0674. Documentation and tracking
    software are also available on this system. The Celestial BBS may be
    accessed 24 hours/day at 300, 1200, or 2400 baud using 8 data bits, 1
    stop bit, no parity.

    Orbital element sets are available via anonymous FTP from the
    following sites:

    archive.afit.af.mil (129.92.1.66)        NASA,TVRO,Shuttle
    directory: /pub/space

    ftp.funet.fi (128.214.6.100)        NASA,TVRO,Molczan,CelBBS,
    directory: /pub/astro/pc/satel        Shuttle (*)

    kilroy.jpl.nasa.gov (128.149.1.165)     NASA,Molczan
    directory: /pub/space/

    nachos.ssesco.com (192.55.187.18)        NASA,Molczan
    directory: /sat_elements


    SPACE DIGEST ARCHIVES

    Copies of back issues of Space Digest are archived on
    [e-mail]. Send mail containing the message "INDEX SPACE" to
    get an index of files; send it the message "GET filename filetype" to
    get a particular file.


LANDSAT AND NASA PHOTOS

    You can get black-and-white 1:1M prints, negatives, or positives for
    $10, $18, $12 respectively for any Landsat data more than 2 years old
    from EDC, (Eros (Earth Resources Orbiting Satellite) Data Center). Call
    them at (605)-594-6511. You get 80 meter resolution from the MSS
    scanner, 135x180 kilometers on a picture 135x180 mm in size. I think you
    have to select one band from (green, red, near IR, second near IR), but
    I'm not sure. Digitial data is also available at higher prices.

    Transparencies of all NASA photos available to the public can be
    borrowed from the NASA photo archive; you can have copies or prints
    made.

     NASA Audio-Visual Facility
     918 North Rengstorff Ave
     Mountain View, CA  94043
     (415)-604-6270


PLANETARY MAPS

    The USGS address for maps of the planets is:

    U.S. Geological Survey,
    Distribution Branch,
    Box 25286, Federal Center, Bldg. 41
    Denver, CO 80225

    Maps cost $2.40 to $3.10 per sheet (a few come in sets of 2 or 3 sheets).

    The best global maps of Mars based on Viking images are 1:15,000,000
    scale in 3 sheets. These maps are:

    I-1535 (2 sheets only) - relief, albedo, names
    I-1535
    I-1618 (3 sheets) - relief, names
    I-2030 (3 sheets) - relief, topographic contours
    I-1802-A,B,C (3 sheets) - geology

    There are many other maps as well: 30 sheets at 1:5,000,000 scale in
    relief, albedo, geology, photomosaic forms (not all 30 sheets available
    in all formats); 140 sheets at 1:2,000,000 scale as photomosaics of the
    whole planet, about 100 sheets of interesting sites at 1:500,000 scale
    in photomosaic format, and lots of special sheets.

    Then there are maps of Mercury, Venus, the Moon, the four Galilean
    Satellites, six moons of Saturn and five of Uranus. [Phil Stooke
    ([e-mail]), the author of this item, has offered to
    respond to email requests for information on any topic relating to lunar
    and planetary maps.]


COMETARY ORBIT DATA

    The Central Bureau for Astronomical Telegrams and the Minor Planet
    Center announce the sixth edition of the Catalogue of Cometary Orbits in
    IAU Circular 4935. The catalogue contains 1292 entries which represent
    all known comets through November 1989 and is 96 pages long.
    Non-subscribers to the Circulars may purchase the catalogue for $15.00
    while the cost to subscribers is $7.50. The basic catalogue in ASCII
    along with a program to extract specific orbits and calculate
    ephemerides is available on MS-DOS 5.25-inch 2S2D diskette at a cost of
    $75.00 (the program requires an 8087 math coprocessor). The catalogue
    alone is also available by e-mail for $37.50 or on magnetic tape for
    $300.00.

    Except for the printed version of the catalogue, the various magnetic
    media or e-mail forms of the catalogue do not specifically meantion
    non-subscribers. It is possible that these forms of the catalogue may
    not be available to non-subscribers or that their prices may be more
    expensive than those given. Mail requests for specific information and
    orders to:

    Central Bureau for Astronomical Telegrams
    Smithsonian Astrophysical Observatory
    Cambridge, MA 02138, USA


NEXT: FAQ #4/15 - Performing calculations and interpreting data formats

------------------------------

Date: 1 Nov 92 18:14:59 GMT
From: Jon Leech <[e-mail]>
Subject: Space FAQ 04/15 - Calculations
Newsgroups: sci.astro,sci.space,news.answers

Archive-name: space/math
Last-modified: $Date: 92/10/31 17:37:51 $

PERFORMING CALCULATIONS AND INTERPRETING DATA FORMATS

    COMPUTING SPACECRAFT ORBITS AND TRAJECTORIES

    References that have been frequently recommended on the net are:

    "Fundamentals of Astrodynamics" Roger Bate, Donald Mueller, Jerry White
    1971, Dover Press, 455pp $8.95 (US) (paperback). ISBN 0-486-60061-0

    NASA Spaceflight handbooks (dating from the 1960s)
    SP-33 Orbital Flight Handbook (3 parts)
    SP-34 Lunar Flight Handbook   (3 parts)
    SP-35 Planetary Flight Handbook (9 parts)

    These might be found in university aeronautics libraries or ordered
    through the US Govt. Printing Office (GPO), although more
    information would probably be needed to order them.

    M. A. Minovitch, _The Determination and Characteristics of Ballistic
    Interplanetary Trajectories Under the Influence of Multiple Planetary
    Attractions_, Technical Report 32-464, Jet Propulsion Laboratory,
    Pasadena, Calif., Oct, 1963.

    The title says all. Starts of with the basics and works its way up.
    Very good. It has a companion article:

    M. Minovitch, _Utilizing Large Planetary Perubations for the Design of
    Deep-Space Solar-Probe and Out of Ecliptic Trajectories_, Technical
    Report 32-849, JPL, Pasadena, Calif., 1965.

    You need to read the first one first to realy understand this one.
    It does include a _short_ summary if you can only find the second.

    Contact JPL for availability of these reports.

    "Spacecraft Attitude Dynamics", Peter C. Hughes 1986, John Wiley and
    Sons.

    "Celestial Mechanics: a computational guide for the practitioner",
    Lawrence G. Taff, (Wiley-Interscience, New York, 1985).

    Starts with the basics (2-body problem, coordinates) and works up to
    orbit determinations, perturbations, and differential corrections.
    Taff also briefly discusses stellar dynamics including a short
    discussion of n-body problems.


    COMPUTING PLANETARY POSITIONS

    More net references:

    Van Flandern & Pullinen, _Low-Precision Formulae for Planetary
    Positions_, Astrophysical J. Supp Series, 41:391-411, 1979. Look in an
    astronomy or physics library for this; also said to be available from
    Willmann-Bell.

    Gives series to compute positions accurate to 1 arc minute for a
    period + or - 300 years from now. Pluto is included but stated to
    have an accuracy of only about 15 arc minutes.

    _Interactive Computer Ephemeris_ (from the US Naval Observatory)
    distributed on IBM-PC floppy disks, $35 (Willmann-Bell). Covers dates
    1800-2049.

    "Planetary Programs and Tables from -4000 to +2800", Bretagnon & Simon
    1986, Willmann-Bell.

    Floppy disks available separately.

    "Fundamentals of Celestial Mechanics" (2nd ed), J.M.A. Danby 1988,
    Willmann-Bell.

    A good fundamental text. Includes BASIC programs; a companion set of
    floppy disks is available separately.

    "Astronomical Formulae for Calculators" (4th ed.), J. Meeus 1988,
    Willmann-Bell.

    "Astronomical Algorithms", J. Meeus 1991, Willmann-Bell.

    If you actively use one of the editions of "Astronomical Formulae
    for Calculators", you will want to replace it with "Astronomical
    Algorithms". This new book is more oriented towards computers than
    calculators and contains formulae for planetary motion based on
    modern work by the Jet Propulsion Laboratory, the U.S. Naval
    Observatory, and the Bureau des Longitudes. The previous books were
    all based on formulae mostly developed in the last century.

    Algorithms available separately on diskette.

    "Practical Astronomy with your Calculator" (3rd ed.), P. Duffett-Smith
    1988, Cambridge University Press.

    "Orbits for Amateurs with a Microcomputer", D. Tattersfield 1984,
    Stanley Thornes, Ltd.

    Includes example programs in BASIC.

    "Orbits for Amateurs II", D. Tattersfield 1987, John Wiley & Sons.

    "Astronomy / Scientific Software" - catalog of shareware, public domain,
    and commercial software for IBM and other PCs. Astronomy software
    includes planetarium simulations, ephemeris generators, astronomical
    databases, solar system simulations, satellite tracking programs,
    celestial mechanics simulators, and more.

    Andromeda Software, Inc.
    P.O. Box 605
    Amherst, NY 14226-0605


    COMPUTING CRATER DIAMETERS FROM EARTH-IMPACTING ASTEROIDS

    Astrogeologist Gene Shoemaker proposes the following formula, based on
    studies of cratering caused by nuclear tests.

             (1/3.4)
    D = S  S  c  K  W        : crater diameter in km
     g  p  f  n

           (1/6)
    S = (g /g )            : gravity correction factor for bodies other than
     g      e  t              Earth, where g = 9.8 m/s^2 and g    is the surface
                        e              t
                  gravity of the target body. This scaling is
                  cited for lunar craters and may hold true for
                  other bodies.

        (1/3.4)
    S = (p / p )        : correction factor for target density p  ,
     p      a   t                                t
                  p  = 1.8 g/cm^3 for alluvium at the Jangle U
                   a
                  crater site, p = 2.6 g/cm^3 for average
                  rock on the continental shields.

    C                : crater collapse factor, 1 for craters <= 3 km
                  in diameter, 1.3 for larger craters (on Earth).

                                (1/3.4)
    K                : .074 km / (kT TNT equivalent)
     n                  empirically determined from the Jangle U
                  nuclear test crater.

          3           2               19
    W = pi * d    * delta * V  / (12 * 4.185 * 10  )
                : projectile kinetic energy in kT TNT equivalent
                  given diameter d, velocity v, and projectile
                  density delta in CGS units. delta of around 3
                  g/cm^3 is fairly good for an asteroid.

    An RMS velocity of V = 20 km/sec may be used for Earth-crossing
    asteroids.

    Under these assumptions, the body which created the Barringer Meteor
    Crater in Arizona (1.13 km diameter) would have been about 40 meters in
    diameter.

    More generally, one can use (after Gehrels, 1985):

    Asteroid        Number of objects  Impact probability  Impact energy
    diameter (km)               (impacts/year)       (* 5*10^20 ergs)

     10                10             10^-8        10^9
      1             1 000             10^-6        10^6
      0.1           100 000             10^-4        10^3

    assuming simple scaling laws. Note that 5*10^20 ergs = 13 000 tons TNT
    equivalent, or the energy released by the Hiroshima A-bomb.

    References:

    Gehrels, T. 1985 Asteroids and comets. _Physics Today_ 38, 32-41. [an
    excellent general overview of the subject for the layman]

    Shoemaker, E.M. 1983 Asteroid and comet bombardment of the earth. _Ann.
    Rev. Earth Planet. Sci._ 11, 461-494. [very long and fairly
    technical but a comprehensive examination of the
     subject]

    Shoemaker, E.M., J.G. Williams, E.F. Helin & R.F. Wolfe 1979
    Earth-crossing asteroids: Orbital classes, collision rates with
    Earth, and origin. In _Asteroids_, T. Gehrels, ed., pp. 253-282,
    University of Arizona Press, Tucson.

    Cunningham, C.J. 1988 _Introduction to Asteroids: The Next Frontier_
    (Richmond: Willman-Bell, Inc.) [covers all aspects of asteroid
    studies and is an excellent introduction to the subject for people
    of all experience levels. It also has a very extensive reference
    list covering essentially all of the reference material in the
    field.]


    MAP PROJECTIONS AND SPHERICAL TRIGNOMETRY

    Two easy-to-find sources of map projections are the "Encyclopaedia
    Brittanica", (particularly the older volumes) and a tutorial appearing
    in _Graphics Gems_ (Academic Press, 1990). The latter was written with
    simplicity of exposition and suitability of digital computation in mind
    (spherical trig formulae also appear, as do digitally-plotted examples).

    More than you ever cared to know about map projections is in John
    Snyder's USGS publication "Map Projections--A Working Manual", USGS
    Professional Paper 1395. This contains detailed descriptions of 32
    projections, with history, features, projection formulas (for both
    spherical earth and ellipsoidal earth), and numerical test cases. It's a
    neat book, all 382 pages worth. This one's $20.

    You might also want the companion volume, by Snyder and Philip Voxland,
    "An Album of Map Projections", USGS Professional Paper 1453. This
    contains less detail on about 130 projections and variants. Formulas are
    in the back, example plots in the front. $14, 250 pages.

    You can order these 2 ways. The cheap, slow way is direct from USGS:
    Earth Science Information Center, US Geological Survey, 507 National
    Center, Reston, VA 22092. (800)-USA-MAPS. They can quote you a price and
    tell you where to send your money. Expect a 6-8 week turnaround time.

    A much faster way (about 1 week) is through Timely Discount Topos,
    (303)-469-5022, 9769 W. 119th Drive, Suite 9, Broomfield, CO 80021. Call
    them and tell them what you want. They'll quote a price, you send a
    check, and then they go to USGS Customer Service Counter and pick it up
    for you. Add about a $3-4 service charge, plus shipping.

    A (perhaps more accessible) mapping article is:

    R. Miller and F. Reddy, "Mapping the World in Pascal",
    Byte V12 #14, December 1987

    Contains Turbo Pascal procedures for five common map projections. A
    demo program, CARTOG.PAS, and a small (6,000 point) coastline data
    is available on CompuServe, GEnie, and many BBSs.

    Some references for spherical trignometry are:

    _Spherical Astronomy_, W.M. Smart, Cambridge U. Press, 1931.

    _A Compendium of Spherical Astronomy_, S. Newcomb, Dover, 1960.

    _Spherical Astronomy_, R.M. Green, Cambridge U. Press., 1985 (update
    of Smart).

    _Spherical Astronomy_, E Woolard and G.Clemence, Academic
    Press, 1966.


    PERFORMING N-BODY SIMULATIONS EFFICIENTLY

    "Computer Simulation Using Particles"
    R. W. Hockney and J. W. Eastwood
    (Adam Hilger; Bristol and Philadelphia; 1988)

    "The rapid evaluation of potential fields in particle systems",
    L. Greengard
    MIT Press, 1988.

        A breakthrough O(N) simulation method. Has been parallelized.

    L. Greengard and V. Rokhlin, "A fast algorithm for particle
    simulations," Journal of Computational Physics, 73:325-348, 1987.

    "An O(N) Algorithm for Three-dimensional N-body Simulations", MSEE
    thesis, Feng Zhao, MIT AILab Technical Report 995, 1987

    "Galactic Dynamics"
    J. Binney & S. Tremaine
    (Princeton U. Press; Princeton; 1987)

        Includes an O(N^2) FORTRAN code written by Aarseth, a pioneer in
        the field.

    Hierarchical (N log N) tree methods are described in these papers:

    A. W. Appel, "An Efficient Program for Many-body Simulation", SIAM
    Journal of Scientific and Statistical Computing, Vol. 6, p. 85,
    1985.

    Barnes & Hut, "A Hierarchical O(N log N) Force-Calculation
    Algorithm", Nature, V324 # 6096, 4-10 Dec 1986.

    L. Hernquist, "Hierarchical N-body Methods", Computer Physics
    Communications, Vol. 48, p. 107, 1988.


    INTERPRETING THE FITS IMAGE FORMAT

    If you just need to examine FITS images, use the ppm package (see the
    comp.graphics FAQ) to convert them to your preferred format. Failing
    that, the basic reference for FITS may be found in the following 3
    papers:

    Wells, D. C., Greisen, E. W., and Harten, R. H., "FITS: a
    flexible image transport system," Astronomy and Astrophysics
    Supplement Series, 44, 363-370, 1981.

    Grosbol, P., Harten, R. H., Greisen, E. W., and Wells, D. C.,
    "Generalized extensions and blocking factors for FITS,"
    Astronomy and Astrophysics Supplement Series, 73, 359-364, 1988

    Harten, R. H., Grosbol. P., Greisen, E. W., and Wells, D. C.,
    "The FITS tables extension, Astronomy and Astrophysics
    Supplement Series, 73, 365-372, 1988.

    A DRAFT document describing FITS and the Floating Point Agreement
    defining FP storage formats is available by anonymous FTP from
    nssdca.gsfc.nasa.gov (128.183.36.23). Get ANON_DIR:[FITS]README.;1 to
    begin with. There are known to be errors and ambiguities in this
    document, so it should not be used as a fundamental reference. Questions
    should be sent by email to the FITS support office
    ([e-mail]) or telephone at (301)-513-1634

    A FORTRAN library for reading and writing FITS files is available by
    anonymous FTP from tetra.gsfc.nasa.gov (128.183.8.77) in directory
    pub/fitsio3. Contact the author, William Pence
    ([e-mail]) for more details.


    SKY (UNIX EPHEMERIS PROGRAM)

    The 6th Edition of the Unix operating system came with several software
    systems not distributed because of older media capacity limitations.
    Included were an ephmeris, a satellite track, and speech synthesis
    software. The ephmeris, sky(6), is available within AT&T and to sites
    possessing a Unix source code license. The program is regarded as Unix
    source code. Sky is <0.5MB. Send proof of source code license to

    E. Miya
    MS 258-5
    NASA Ames Research Center
    Moffett Field, CA 94035-1000
    [e-mail]


    THREE-DIMENSIONAL STAR/GALAXY COORDINATES

    To generate 3D coordinates of astronomical objects, first obtain an
    astronomical database which specifies right ascension, declination, and
    parallax for the objects. Convert parallax into distance using the
    formula in part 6 of the FAQ, convert RA and declination to coordinates
    on a unit sphere (see some of the references on planetary positions and
    spherical trignometry earlier in this section for details on this), and
    scale this by the distance.

    Two databases useful for this purpose are the Yale Bright Star catalog
    (sources listed in FAQ section 3) or "The Catalogue of Stars within 25
    parsecs of the Sun" (in pub/SPACE/FAQ/stars.data and stars.doc on
    ames.arc.nasa.gov).


NEXT: FAQ #5/15 - References on specific areas

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End of Space Digest Volume 15 : Issue 366
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