|
|
|
Model
of a stc file |
Observations |
|
# Sirius B 300001 { RA
101.2886 Dec
-16.71314306 Distance
8.601223 SpectralType "D" AppMag
15 } |
In degrees from -90° to90° In light-year |
Detailed description :
These files allow
you to add stars in Celestia in a very easy way by using stc files such as the ssc
files used to add objects around any planets or stars you want.
In
Celestia your star will be called, HIP followed by the number written in your
ssc file, for example there it will be called HIP 300001 (the stars called HIP
xxxxxx come from the Hipparcos catalog which contains nearly 120.000 stars,
that's why you should give your star a number greater than 120.000 so that you
won't have twice the same number).
Anyway you can rename your star later by editing the
file starnames.dat as this file contains the name of all the file you see in
Celestia, so you just have to add a line at the end like this one :
118322:EPS Tuc
300001:Sirius B
So your star HIP 300001 should be recognized by
Celestia as the dwarf star Sirius B.
Distance —>
Distance from the sun in light-years
Spectraltype —>
See the page Stars.dat
Celestia uses the following formula to determine the
radius of a star:
Radius = sqrt (luminosity)* (solar temp/star temp)**2
A star's luminosity is determined from its absolute
magnitude (or apparent magnitude and distance). Celestia uses some lookup
tables to determine a star's temperature, depending on the star's class and
subclass.
------------------------Thanks
to Selden------------------------
