Scott Tilley wrote: > NOSS 3-2 seems to be consistently running ~3min late when using these > elsets from Mike's Classified TLEs: > > NOSS 3-2 (A) > 1 28095U 03054A 11309.00606613 0.00000030 00000-0 52008-4 0 07 > 2 28095 63.4300 141.0143 0123000 359.6503 0.3496 13.40763624 01 > NOSS 3-2 (C) > 1 28097U 03054C 11309.00614772 0.00000020 00000-0 34621-4 0 04 > 2 28097 63.4300 141.1867 0125000 359.5789 0.4211 13.40763551 09 > > Doppler curve: > > http://dl.dropbox.com/u/15916951/SATOBS/Sband_1111161400_NOSS3_2.JPG The NOSS constellation has been undergoing some adjustments in recent months, perhaps to optimize coverage with the addition of the NOSS 3-5 pair (11014A / 37386, 11014B / 37391). This involves drifting certain pairs for a time, forward or backward along track, by manoeuvring out of the constellation's operational mean motion, which is currently near 13.4058 rev/d. The NOSS 3-2 pair manoeuvred to a mean motion near 13.41 rev/d sometime between day 11232 and 11250, and was in the process of manoeuvring back to the operational mean motion when last observed optically, near the epoch of the above elements. Probably, they completed their manoeuvres soon after day 11309, which would account for their late arrival. I have adjusted the above to approximate the time of closest approach on your Doppler curve: 1 78095U 11320.56848677 .00000030 00000-0 52008-4 0 02 2 78095 63.4300 111.5942 0123000 359.6104 0.4804 13.40580000 01 1 78097U 11320.56859369 .00000020 00000-0 34621-4 0 04 2 78097 63.4300 111.7662 0125000 359.5390 0.5499 13.40580000 03 These should be adequate to facilitate reacquiring them optically, but if you have other curves for this pair, I will consider making further adjustments. Ted Molczan _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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