Standard magnitude of UARS

Rainer Kracht (0412188960-0001@t-online.de)
Tue, 5 Dec 95 00:32 +0100

 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