The Trapezium stars of Orion are unfortunately missing one member in the distribution Celestia (because Theta(1) Ori B has no Hipparcos designation). And, until v1.3.2, they were also incorrectly positioned and named in Celestia. With the distances and names fixed in v1.3.2, it seems useful to complete the Trapezium by adding a definition for Tet1 Ori B. This tiny stc file adds the missing star - it should be placed in your extras folder:
1009544774 "TET1 Ori B:41 Ori B:BM Ori:HD 37021"
{
RA 83.81695833
Dec -5.38527778
Distance 1399.97
SpectralType "B0V"
AppMag 7.96
}
Unfortunately the Trapezium appears to be missing three of its stars in
Pascal Hartmann's extended stars.dat. This add-on therefore doesn't conflict
with the big stars.dat, but isn't any great benefit to it, either.
Note (updated 7-jul-2006)
Starting with Celestia v1.4.0, all three of the Trapezium stars
measured by Hipparcos have corrected values provided in Celestia's
catalog file
revised.stc. As a result, those three stars
are all visible even when using
the extended stars.dat and this add-on is equally useful
with all versions of stars.dat.
Grant
This Web page is maintained by Selden Ball
at Wilson Lab.
Please send any comments or corrections to
seb@lepp.cornell.edu