[guide-user] Re: magnitude derivation in Charon

Matt Dawson Jan 24, 2000

Charon will give you the magnitude of the object nearest the cursor for
which a centroid has been calculated, whether that is a star or
asteroid or whatever.In the case of an asteroid, that may be well be
some distance away from the red cross hair if the object has wandered
from predicted position or the elements are out of date. When I want to
do astrometry on VERY faint objects(fainter than about mag 20)that are
half lost in noise I have to fiddle with parameters to get a centroid
at all. Obviously this astrometry is of limited value, but sometimes
better than none.
Matt
As discussed elswhere on the Guide website the magnitudes based on GSC
etc are somewhat dodgy anyhow.