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             Software for Guide Star Catalog Data

                                             1 2
             (C)   1993  by  Nikolay Sokolov
1
 Central Astronomical Observatory at Pulkovo, St.Petersburg 196140, Russia
2
 University of Crete, Physics Department, Heraklion 714 09, Crete, Greece   




     1.0 Introduction
    
    In order to determine the field of view your telescope on the sky 
or to compare the results of the observation with data from Guide Star
Catalog (GSC) the software BRUNGSC can be useful for your work.
    BRUNGSC is a user program for the IBM PC which allows scan GSC for
objects within a user specified region, draw a sky map of the region 
in standard celestial coordinates (right ascension and declination) or
in tangential plane (field of view of photometer). In same time you can
change a size of the region, limit of magnitude and produce ASCII table
of the region.
    The hardware requirements for BRUNGSC are the IBM PC or compatible
with a CD-ROM drive, EGA or VGA graphics and the Guide Star Catalog
CD-ROMs (version 1.0 or 1.1).
    I hope, that the BRUNGSC will be useful for astronomers using the 
panorama CCD-photometers.


     2.0 Commands of BRUNGSC

    First of all, you must open the drive with GSC disk. Please, press
key <Enter> in the first string of the program, input letter from A:
to W: and press key <Enter> again. This is the rule for all commands 
of BRUNGSC. In order to quit BRUNGSC press <Esc> the key and the 
program stops.

     2.1 Coordinates central point of chart

    For input the coordinates of central point of chart you select
third (for right ascension) or fourth (for declination) string of 
program and enter data. I would like to note that for declination 
need to enter "+" sign or "-" always.

     2.2 Size of chart and limit of magnitude

    For change of size of the chart you select fourth or fifth string
of program for right ascension and declination in minutes of arc 
respectively. For standard celestial coordinates the size will be
along right ascension and declination, in same time for tangential
plane those sizes will be along column and row you CCD-photometer 
(of course, if orientation your photometer is correct). In case if you
want changes limit of magnitude select sixth string of program and
enter data. 

     2.3 Draw chart on screen

    In order to plot the chart you select eighth for plot the chart 
in standard celestial coordinates and ninth string of the program for
plot chart in tangential plane. The program begins reading of data 
GSC and plot stars on the screen. At the end of the work the program 
give scale of magnitude. If you want or not draw the coordinates
network then select seventh string of the program and input letters 
"y" (yes) or "n" (not). 

     2.4 Create the file of coordinates

    For create the ASCII file selects tenth string of the program
and press <Enter>. The program asks you: "Do you want standard plane ?"
If you put letter "y" then the program begins reading of data GSC,
plot stars on the screen and put standard coordinates (right ascension 
and declination), screen coordinates and magnitude every star of your
chart into ASCII file.
If you put letter "n" then the program asks you: "Do you want tangent
plane ?". In this case, the program put same data of your tangent plane
into ASCII file.
    At present last command "Create PS file" does not work and will be 
in the next version of this program.

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    If you have the questions or suggestions for author then send 
E-mail: sokolov@iesl.forth.gr or telex: 121351 PULOB SU