Standard magnitude of UARS --------------------------- From Russell's observations (1991 Apr 26 to 1995 Nov 30) I have derived a standard magnitude (1000 km, 90 deg) for UARS (91-63B). There are 264 observations by Russell, 222 of them in pairs and marked "S" (steady). One of these 222 observations (from 1994 Sep 04) has an observed magnitude of -2.7 (range 625 km) and is certainly not suitable to derive a standard magnitude. After reducing the remaining 221 obs to the standard distance of 1000 km (mag1000), there are 23 obs independent of phase angle (28 to 132 deg) near mag1000 = 2.9. mag1000 <= 3.15 UARS 1991-063B 23 2.86 +/- 0.07 -0.0003 +/- 0.0018 mag1000 > 3.15 UARS 1991-063B 198 4.35 +/- 0.03 0.0101 +/- 0.0010 All UARS 1991-063B 221 4.24 +/- 0.04 0.0106 +/- 0.0014 column 1 : name column 2 : international designation column 3 : number of observations column 4 : standard magnitude column 5 : phase coefficient So Ted Molczan's standard magnitude of 4.4 seems to be well chosen for about 90% of the observations. The RAE-Tables have for UARS: Shape and weight (kg): Irregular cylinder + panel 6540 Size (m) : 9.75 long, 4.57 dia Rainer Kracht 0412188960-0001@t-online.de