It depends on what the burn is suppose to do. If the burn is raising the perigee, then it would occur during apogee. It's in a 24+ hr orbit so about 12hr before perigee it would be at apogee. If it's at perigee around 14:13UT, then it should be near apogee around 2:13 UT which is near the 2:23 UT time given for the burn. Bill Bard ---------- >From: Ron Lee <ronlee@pcisys.net> >To: SeeSat-L@blackadder.lmsal.com >Subject: Chandra IPS-1 Visibility >Date: Sat, Jul 24, 1999, 1:54 PM > >Chandra >1 25867U 99040B 99204.55311668 -.00000050 00000-0 10000-3 0 68 >2 25867 28.5826 196.7564 8422595 269.7720 6.5176 0.97132965 26 > >ASSUMING I have made no mistakes, I get a perigee at around 14:13 UT on >25 Jul 99. This occurs basically south of Rio de Janeiro while that >region is in daylight. Thus the IPS-1 burn will not be visible. > >However, other data indicates the IPS-1 burn should occur around 2:23 UT >on 25 Jul so I do not understand the discrepancy. I assumed the burn >would occur at perigee. > >Ron Lee >