home *** CD-ROM | disk | FTP | other *** search
- WIDE ANGLE STAR VIEW
-
- This is the wide angle star view. It's
- approximate dimensions are 2 hrs R.A.
- along the horizontal axis by 30 deg.
- Dec. along the vertical axis. Stars
- are displayed to magnitude 6.5.
- Star colours correspond to spectral
- type according to the following table.
-
- Spectral type Star colour
-
- O,B Light Blue
- A White
- F Green
- G0-G5 Yellow
- G6-G10 Bright Red
- K Bright Red
- M Dark Red
- all others White
-
- All the stars displayed in this view are
- listed in the Yale Bright Star Catalogue.
- As such there is extensive information
- available for each star. Click the left
- mouse button while the mouse cursor is on
- a star to see this information displayed
- in the main text window below the wide
- angle star view.
-
- Clicking the right mouse button will
- display the main and finder fields of
- view centred on the position of the
- mouse cursor.
-
- Press <F2> to enable/disable the coordinate
- grid.
-
- MAIN TEXT WINDOW
-
- This is where all the information on stars
- and deep sky objects (DSO's) is displayed.
-
- To identify stars in the wide angle
- star view click on the star with the left
- mouse button. The first line then gives the
- star name (proper name and Greek designation
- ie. Alpha Centauri (Rigil Kentaurus) ). If
- there is none then the star's Henry Draper
- catalogue number is displayed. The second
- line shows the star's rank in the
- constellation. Alpha Centauri would be 01
- Centauri. The following lines give the star's
- coordinates in R.A. and Dec. as well as
- magnitude, distance and spectral type. The
- last line shows the magnitude difference and
- separation of components (in seconds of arc)
- in a binary system. If any of this
- information is not available that line will
- be blank.
-
- To identify DSO's in the main or finder fields
- of view click on the object with the left
- mouse button. The first line in the main text
- window will then show the objects name. The
- second line (AKA) shows other appropriate names
- for the object (ie. NGC 224 is AKA M31).
- The next line gives the object type. This
- displays what type of object you have selected
- (ie. Galaxy, Planetary Nebula etc.). The
- next line is for object class. This is most
- frequently when the object is a galaxy.
- The object class then shows the Hubble
- galaxy class. The following lines show
- R.A., Dec., magnitude and size. Finally
- the last two lines show what constellation
- the object is in and its NGC description,
- if any. This description is fairly cryptic
- but can be decoded using Appendix 1 in the
- manual.
-
- If you wish to identify a star in the main or
- finder fields of view click on the star
- with the right mouse button. The information
- is organized the same as stars identified
- in the wide angle star view however many more
- stars are available. To save disk space
- stars which are not displayed in the wide
- angle star view (not Yale Bright Star
- Catalogue) only show the SAO number,
- basic spectral type, magnitude and
- coordinates. This information is derived
- from the Smithsonian Astrophysical
- Observatory catalogue.
-
- TOGGLE OBJECTS
-
- Click on an object with the left mouse
- button to toggle the display of that
- object on or off. When an object will
- not be displayed it is grayed out.
- After toggling an objects display status
- use Replot to implement the change
- immediately. Otherwise the change will
- occur when the main and finder fields
- are next redrawn.
-
- SCOPES
-
- Use this menu to reconfigure the main
- and finder scope fields to match your
- own telescope(s). As many configurations
- as necessary can be set up and saved.
- Use this menu to enable/disable DSO
- magnitude filtering. All DSO's with a
- magnitude fainter than the magnitude limit
- set for the main scope field of view will
- not be displayed in either the main or
- finder scope fields.
-
- After enabling/disabling the DSO
- magnitude limit the next question asks if
- you wish to load a file. Press <enter>
- to close the window. If you answer <y>es
- then you will be prompted for a file name.
- File names are entered without an extension.
- Once a save file is loaded Deep Sky will
- display it for you to check. If you
- answer <n>o then you will be prompted
- for the required information. The previous
- values are shown. If these are OK press
- <enter> to retain these values. When
- finished Deep Sky will ask if you wish to
- save the configuration in a file. Enter a
- file name (without extension) and the
- configuration will be saved to disk. If
- you name the file 'scopes' then this will
- become the default configuration and will
- be loaded whenever Deep Sky is run.
-
- Note that whenever you make a change to
- the scope parameters you must select
- REPLOT to implement these changes
- immediately. Otherwise Deep Sky uses the
- changes when it next plots the finder/main
- scope fields.
-
- PLOT
-
- If you know the coordinates of the area
- of sky you wish to display you can
- enter the coordinates directly using this
- option. Enter the coordinates in decimal
- degrees and decimal hours. The
- coordinates entered will be for the lower
- right corner of the displayed area.
-
- SEARCH
-
- Search is used to find DSO's or stars if
- you do not know their location or name. As
- well you can set a number of search parameters
- to look for more than one object. One example
- would be to build an observing list.
-
- Once Search is selected a menu pops up with
- various options.
- These are:
- 1. Search for object
- 2. Search for star
- 3. Customize search
- 4. Exit
-
- When Search for object is selected a small
- dialogue box pops up. Enter the objects
- catalogue number. There are many different
- catalogues in the database. Most DSO's
- appear in several of them. The most
- familiar catalogues will be the NGC and
- Messier catalogues. Others are listed in
- appendix C. Searches are not case
- sensitive. Spaces between the catalogue
- (ie. NGC) and number(224) are optional.
-
- One example would be to search for the
- Andromeda Galaxy. This is listed in the
- database as M31 or NGC 224. Entering
- either number will find it.
-
- Once the object is found a text window will
- pop up with all the available information on
- the object and you will be asked if you wish
- to plot a finder chart.
-
- Search for star works in a similar manner.
- Here you enter a star's common name,
- designation, Henry Draper or SAO catalogue
- number. You are also given the option of
- plotting a finder chart. Searches are
- conducted in the following order; common
- name, designation, catalogue number.
-
- When a finder chart is plotted the main
- screen replots with the star (or object)
- roughly centred in the wide angle star
- field. The information available for the
- star or object is also displayed. As well
- the main and finder scope fields are plotted
- with the object centred.
-
- Selecting Customize Search allows you to set
- search criteria for DSO's. Using this option
- you can select the type of object, a magnitude
- range for the objects, the constellation or a
- range of coordinates. Search criteria can be
- combined in any way. Thus, for example, you
- can search for all galaxies in Auriga between
- magnitude 5 and 9. As each search criterium is
- selected an asterisk will appear beside that
- menu selection. If you make a mistake
- simply click on that menu item or enter its
- number again to deselect it.
-
- After the search starts each object's
- information will be displayed in turn. You
- can then plot a finder chart or go on to
- the next object.
-
- SKY
-
- When you select SKY the screen will be redrawn
- as a hemispheric map of the entire sky. Each
- hemisphere is divided by lines every 2 hrs. of
- R.A. and every 30 deg. of Declination. Lines
- of R.A. are labelled.
-
- When you move the mouse around the map the R.A.
- and Dec. are constantly displayed. These
- coordinates are calculated to correctly display
- the section of the sky the mouse is currently
- pointing to. When the left mouse button is
- clicked this section will be displayed on the
- main screen.
-
- REPLOT
-
- Use this command to replot the main and finder
- scope fields.
-
- FINDER SCOPE
-
- Stars and DSOs are plotted according to the
- parameters set out in the scope configuration
- file. The field can be inverted or reversed.
- As well the field of view can be set (in
- degrees) and a magnitude limit set. This
- magnitude limit applies to stars plotted
- in the finder field of view. Press <F8> to
- show the main scope field size as a red circle
- superimposed on the finder field. Press <F8>
- to remove the circle.
-
- MAIN SCOPE
-
- Stars and DSOs are plotted according to the
- parameters set out in the scope configuration
- file. The field can be inverted or reversed.
- As well the field of view can be set (in
- degrees) and a magnitude limit set. This
- magnitude limit applies to stars plotted
- in the main field of view. If the DSO
- magnitude filter is enabled then DSOs will
- also have the magnitude filter applied to
- them. As well DSOs in the finder field of
- view will be filtered. If the object of
- interest has not been centred in the main
- scope field you can adjust the centring if
- you wish. Press "P" to enable panning then
- using the mouse, move the cursor to the
- desired main scope centre in the finder field
- and click the left mouse button. The field
- will be replotted with the new centre.
-
- FINDER SCOPE INFORMATION
-
- Information in this field gives the scope
- parameters that apply to the finder scope
- field. These are inverted or reversed (i,r
- or ir), magnitude limit and field of view.
-
- MAIN SCOPE INFORMATION
-
- Information in this field gives the scope
- parameters that apply to the finder scope
- field. These are inverted or reversed (i,r
- or ir), magnitude limit and field of view.
-
- MAGNITUDE SCALE
-
- This scale shows the size of stars plotted
- in the main and finder fields related to
- their respective magnitude. The scale can
- be adjusted by pressing the "+" or "-" keys.
- Use REPLOT to make the changes visible
- immediately.
-
-
-