I have derived the following from observations by David Brierley, Russell Eberst, Bjoern Gimle, Alberto Rango, Peter Wakelin and Mike Waterman, received to this moment: Arc 2003 Apr 23 -23 UTC: IGS 1A 0.0 0.0 0.0 5.6 v 1 27698U 03009A 03113.92273523 .00008810 00000-0 35165-3 0 08 2 27698 97.4064 185.9818 0007262 231.3989 128.6599 15.25177883 03 WRMS residuals = 0.079 deg Arc 2003 Apr 22 - 23 UTC: IGS 1B 0.0 0.0 0.0 3.1 v 1 27699U 03009B 03113.83008908 .00010000 00000-0 41892-3 0 00 2 27699 97.4104 185.8045 0008906 124.0001 236.2083 15.23539543 06 WRMS residuals = 0.021 deg The magnitude of IGS 1A's manoeuvre appears to have been greater than I expected; however, residuals are high, so I suggest looking at least 1 min early, just in case the orbit is lower than it appears. IGS 1B is likely to lower its orbit at any time, so I recommend looking early by at least 3 minutes. There are many objects in orbits similar to the above, so if time permits, it is a good idea to run IDSAT or Findsat to find those that will pass through the look position, so that they may be avoided. Ted Molczan ----------------------------------------------------------------- To unsubscribe from SeeSat-L, send a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@satobs.org List archived at http://www.satobs.org/seesat/seesatindex.html
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