While waiting for the LCROSS impact this morning I installed UCAC3 from the USNO DVD. Using the newest version of Guide, 7-Oct, the UCAC3 stars seem to be displaying properly. I have however found a behavior which I don't understand. Here is a specific example. Go to SAO 98960. At fixed level 7 (2°) the info box for this star shows SAO, TYC, PPM, HIP,and HD identifiers and a magnitude of 7.149. Now zoom in to level 10 (15'). Now I get an info box that only has shows identifiers for 3UC & 2MASS and a magnitude of 15.6. I'm sure there is a explanation for what is occurring, but I can't figure it out.

Mark