Space & Astronomy/Space and Astronomy (October 1993).iso/pc/text/spacedig/v12_5/v12_554.txt

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Subject: SPACE Digest V12 #554

SPACE Digest                                     Volume 12 : Issue 554

Today's Topics:
         Re: Payload Status for 11/08/90 (Forwarded)
        Cassini Investigation Team (Forwarded)
          Re: CRAF/Cassini Update - 11/09/90
          Re: Space Station Work Package #3
         Re: LLNL size and Fred micrograv environment

Administrivia:

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Date: 13 Nov 90 03:49:36 GMT
From: mnetor!utzoo![e-mail]  (Henry Spencer)
Organization: U of Toronto Zoology
Subject: Re: Payload Status for 11/08/90 (Forwarded)
References: <[e-mail]>, <[e-mail]>
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In article <[e-mail]> [e-mail] (Richard Akerman) writes:
>... I see frequent mentions of "argon
>servicing for the Astro-1".  What exactly is the purpose of this servicing?
>Does the payload need some sort of inert environment?

Not quite:  some of the sensors need to be kept cold, seriously cold, and
this is done with liquid or solid argon (depending on details of planned
procedures).
--
"I don't *want* to be normal!"         | Henry Spencer at U of Toronto Zoology
"Not to worry."                        |  [e-mail]   utzoo!henry

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Date: 13 Nov 90 23:04:29 GMT
From: sdd.hp.com!elroy.jpl.nasa.gov!mahendo!jato!mars.jpl.nasa.gov![e-mail]  (Ron Baalke)
Organization: Jet Propulsion Laboratory, Pasadena, CA.
Subject: Cassini Investigation Team (Forwarded)
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     INVESTIGATIONS SELECTED FOR THE CASSINI SATURN ORBITER
                INVESTIGATION ACCOMMODATION PHASE


PRINCIPAL INVESTIGATOR, INSTRUMENT PAYLOAD

Virgil G. Kunde, Infrared Fourier Spectrometer, NASA Goddard
Space Flight Center

Eberhard Grun, Cosmic Dust Analyzer, Max-Planck-Institut fuer
Kernphysik, Federal Republic of Germany

Donald A. Gurnett, Plasma and Radio Wave System, University of
Iowa

David T. Young, Plasma Spectrometer, Southwest Research Institute

Larry W. Esposito, Ultraviolet Spectrometer and Imager,
University of Colorado

Stamatios M. Krimigis, Magnetospheric Imaging Instrument, Johns
Hopkins University

David J. Southwood, Dual Technique Magnetometer, Imperial
College, United Kingdom



INTERDISCIPLINARY SCIENTISTS

Tobias C. Owen, Atmospheres, University of Hawaii

Jeffrey N. Cuzzi, Rings and Dust, NASA Ames Research Center

Laurence A. Soderblom, Satellites and Asteriods, U.S. Geological
Survey

Michel Blanc, Magnetosphere and Plasma, Observatoire Midi-
Pyrenees, France

Tamas I. Gombosi, Magnetosphere and Plasma, University of
Michigan

James B. Pollack, Origin and Evolution, NASA Ames Research Center

Darrell F. Strobel, Aeronomy and Solar Wind Interaction, Johns
Hopkins University


FACILITY INSTRUMENT TEAMS

Titan Radar Mapper:

Charles Elachi, NASA Jet Propulsion Laboratory, Team Leader

Randolph L. Kirk, U.S. Geological Survey

Chris G. Rapley, University College, United Kingdom

Giovanni Picardi, Universita di Roma, Italy

Charles A. Wood, University of North Dakota

Steven J. Ostro, NASA Jet Propulsion Laboratory

Howard A. Zebker, NASA Jet Propulsion Laboratory


Imaging Science Subsystem:

Carolyn C. Porco, University of Arizona, Team Leader

Gerhard Neukum, Deutsche Agentur fuer Raumfahrtangelegenheiten
GmbH, Federal Republic of Germany

Steven W. Squyres, Cornell University

Peter C. Thomas, Cornell University

Alfred S. McEwen, U.S. Geological Survey

Torrence V. Johnson, NASA Jet Propulsion Laboratory

Joseph Veverka, Cornell University

Henry C. Dones, Jr., University of Toronto, Canada

Carl D. Murray, University of London, United Kingdom

Joseph A. Burns, Cornell University

Andre Brahic, Observatoire de Paris-Meudon, France

Anthony D. Del Genio, NASA Goddard Institute for Space Studies

Andrew P. Ingersoll, California Institute of Technology

Robert A. West, NASA Jet Propulsion Laboratory


Radio Science Subsystem:

Arvydas J. Kliore, NASA Jet Propulsion Laboratory, Team Leader

Andrew F. Nagy, University of Michigan

F. Michael Flasar, NASA Goddard Space Flight Center

Richard G. French, Wellesley College

Essam A. Marouf, Stanford University

John D. Anderson, NASA Jet Propulsion Laboratory

Nicole Borderies, Observatoire Midi-Pyrenees, France

Hugo D. Wahlquist, NASA Jet Propulsion Laboratory

Bruno Bertotti, Universita di Pavia, Italy

Luciano Iess, Istituto di Fisica dello Spazio Interplanetario,
Italy


Ion and Neutral Mass Spectrometer:

A Facility Instrument Definition Team is to be appointed.  A
Science Team will be solicited through a separate announcement
of opportunity.



Visual and Infrared Mapping Spectrometer:

Facility Instrument approved for Investigation Accommodation
Phase; to be included in payload only if resources permit.

Robert H. Brown, NASA Jet Propulsion Laboratory, Team Leader

Dale P. Cruikshank, NASA Ames Research Center

Roger N. Clark, U.S. Geological Survey

Andrea Carusi, Istituto di Astrofisica Spaziale, Italy

Angioletta Coradini, Istituto di Astrofisica Spaziale, Italy

Jean-Pierre Bibring, Universite de Paris Sud-Orsay, France

Christophe Sotin, Universite de Paris Sud-Orsay, France

Yves Langevin, Universite de Paris Sud-Orsay, France

Robert M. Nelson, NASA Jet Propulsion Laboratory

Ralf Jaumann, Deutsche Agentur fuer Raumfahrtangelegenheiten
GmbH, Federal Republic of Germany

Dennis L. Matson, NASA Jet Propulsion Laboratory

Kevin H. Baines, NASA Jet Propulsion Laboratory

Vittorio Formisano, Istituto Fisica Plasma Interplanetario, Italy

Michael Combes, Observatoire de Paris-Meudon France

Pierre Drossart, Observatoire de Paris-Meudon, France

Bruno Sicardy, Observatoire de Paris-Meudon, France

      ___    _____     ___
     /_ /|  /____/ \  /_ /|
     | | | |  __ \ /| | | |      Ron Baalke         | [e-mail]
  ___| | | | |__) |/  | | |___   Jet Propulsion Lab | [e-mail]
 /___| | | |  ___/    | |/__ /|  M/S 301-355        |
 |_____|/  |_|/       |_____|/   Pasadena, CA 91109 |

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Date: 13 Nov 90 10:43:19 GMT
From: eru!hagbard!sunic!mcsun!corton!irisa!irisa.fr![e-mail]  (Henry Thomas)
Organization: IRISA/INRIA Rennes
Subject: Re: CRAF/Cassini Update - 11/09/90
References: <[e-mail]>, <[e-mail]>
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In article <[e-mail]>, [e-mail] writes:
|> In article <[e-mail]>, [e-mail] (Ron Baalke) writes:
|> >
|> >                          CRAF/Cassini Status Report
|> >                              November 9, 1990
|> > ...take the Huygens probe about 3 hours to parachute all the way down to the
|> > surface of Titan; if the probe survives the landing, valuable data will
|> > continue to be transmitted back for about 30 more minutes.  No more data will
|> > be returned to the Cassini orbiter from Huygens on any subsequent orbits, as
|> > the battery onboard Huygens will have rundown by then.
|> >
|>
|> 30 minutes! Why can't we send an advanced long-life, Viking-style probe
|> to Titan instead?! The Viking lander was "only" about twice as heavy as the
|> Huygens probe will be so the lack of a powerful-enough launcher surely cannot
|> be the reason? Is this just because of financial considerations again, or...?

The reason is maybe that we have NO data of the condition down there:
    - Is there any *solid* ground ?
    - pressure ?
    - temperature ?
So with no information, it seems difficult to design a long-life probe.
A similar(?) problem occured on Venus, where the probes Venera 11-14 lasted only a few hours. The first ones didn't reached the ground because theirs parachutes where destroyed by the acid atmosphere.
On mars, the informations where much more complete, because the ground had been observed by many orbital probes: it was visible.

There was an excellent article in the ESA journal (?), some month ago about "Cassini Probe  Huygens Entry techniques" .


--
-- E-mail: [e-mail]
Henry Thomas - IRISA Campus Universitaire de Beaulieu 35042 RENNES CEDEX FRANCE
Phone: [phone] +549  Fax: [phone]  Telex: UNIRISA 950 473F
X.400: C=FR;ADMD=ATLAS;PRMD=irisa;S=hthomas  Telex:/X121=842950473/@atlas.fr

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Date: 13 Nov 90 17:28:15 GMT
From: julius.cs.uiuc.edu!rpi!zaphod.mps.ohio-state.edu!samsung!cs.utexas.edu!news-server.csri.toronto.edu!utgpu!utzoo![e-mail]  (Henry Spencer)
Organization: U of Toronto Zoology
Subject: Re: Space Station Work Package #3
References: <[e-mail]>, <[e-mail]>, <[e-mail]>
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To: [e-mail]

In article <[e-mail]> [e-mail] (Charles Radley) writes:
>Freedom includes microgravity and life science capability, without
>the additional expense of these free-flyers...

And without their additional capabilities.

>The LLNL/Free-flyer
>system combination is  not useful for life sciences...

How so?  What does Fred have in intrinsic capabilities -- as opposed to
problems that can be fixed by just shipping up the right equipment --
that LLNL doesn't?  Note that LLNL has variable gravity, which Fred lacks
and which is of some substantial importance.

>Freedom also
>has some polar orbit free-flyers for Earth Observation activites,

Not any more it doesn't.  They have been split off as independent projects,
which is what they really were all along.  They had absolutely nothing to
do with the space station.
--
"I don't *want* to be normal!"         | Henry Spencer at U of Toronto Zoology
"Not to worry."                        |  [e-mail]   utzoo!henry

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Date: Tue, 13 Nov 90 14:55:19 -0500
From: "Allen W. Sherzer" <[e-mail]>
To: [e-mail]
Subject: Re: LLNL size and Fred micrograv environment
Newsgroups: sci.space
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References: <[e-mail]> <[e-mail]> <[e-mail]>
Organization: Evil Geniuses for a Better Tomorrow
Cc:

In article <[e-mail]>:

>+This is not a benefit, it is a liability.  Ask the micrograv
>+researchers.  A free-flyer can be tailored to the job, and
>+does not suffer from vibration or CG shifts on the station proper.

>In an ideal sense this is true.  In practice, experiments fail all
>the time, and benefit from human intervention to get them going
>again.

But then the things you do to fix the failed experiment may well
break several others. This is why microgravity people would rather
have a free-flyer.

>It is rather the reverse, the experiments will have to be scheduled
>around when the burns are required, which will be once or twice per
>orbit.

Not a serious problem.

>+On a manned platform, you are going to have vibration any time the
>+crew is moving around, which will be much of the time.  There is work
>+which cannot be done on a manned platform, and the Fred design
>+doesn't allow for it at all.

>Indeed.   It is a trade off.  NASA considers human presence to be
>of benefit, on balance.

This is true. The problem is that the benefit goes to NASA and not
to the people doing microgravity work.

       Many material scientists, concerned over vibrations in
       the station that would be caused by nearby astronauts,
       continue to urge NASA to consider removing their projects
       to orbiting laboratories that would only be visited by
       astronauts.

               -- Avation Week Nov. 12, 1990 page 27

  Allen
--
+---------------------------------------------------------------------------+
|Allen W. Sherzer| I had a guaranteed military sale with ED-209. Renovation |
|   [e-mail]  | programs, spare parts for 25 years. Who cares if it      |
|                | works or not?  - Dick Jones, VP OCP Security Concepts    |

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End of SPACE Digest V12 #554
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