USA 245 (13043A / 39232) was last observed by Russell Eberst, on 2021 Aug 23 at 20:45 UTC. Cees Bassa reported a non-sighting on 2021 Aug 27 at 20:16 UTC. Based on its mean motion, 13043A seemed due for a reboost. Based on data on historical manoeuvres, that I have NOT updated since 2013, a reboost was most likely to have been made on Aug 26, and less likely on Aug 25. The likeliest time span would have been between about 08:00 UTC and 19:00 UTC. The post manoeuvre mean motion would have been between about 14.74 rev/d and 14.81 rev/d. I offer the following search elements based on these criteria, which are derived from the latest TLE issued by Mike McCants. The epochs correspond to passage through perigee. Aug 25 earliest manoeuvre 264 X 982 km 1 79001U 79001A 21237.34986111 .00011500 00000-0 11734-3 0 01 2 79001 97.8709 299.3707 0512600 63.3881 0.9181 14.81000000 02 264 X 1026 km 1 79002U 79002A 21237.34986112 .00011500 00000-0 11734-3 0 04 2 79002 97.8709 299.3707 0542500 63.3881 0.9181 14.74000000 07 Aug 25 latest manoeuvre 264 X 982 km 1 79003U 79003A 21237.75440972 .00011500 00000-0 11734-3 0 00 2 79003 97.8709 299.7711 0512600 62.0622 0.9237 14.81000000 04 264 X 1026 km 1 79004U 79004A 21237.75440973 .00011500 00000-0 11734-3 0 03 2 79004 97.8709 299.7711 0542500 62.0622 0.9237 14.74000000 09 Aug 26 earliest manoeuvre 264 X 982 km 1 79005U 79005A 21238.36123843 .00011500 00000-0 11734-3 0 07 2 79005 97.8709 300.3718 0512600 60.0733 0.9885 14.81000000 02 264 X 1026 km 1 79006U 79006A 21238.36123844 .00011500 00000-0 11734-3 0 00 2 79006 97.8709 300.3718 0542500 60.0733 0.9885 14.74000000 07 Aug 26 latest manoeuvre 264 X 982 km 1 79007U 79007A 21238.76521991 .00011500 00000-0 11734-3 0 01 2 79007 97.8709 300.7717 0512600 58.7493 358.0000 14.81000000 00 264 X 1026 km 1 79008U 79008A 21238.76521992 .00011500 00000-0 11734-3 0 04 2 79008 97.8709 300.7717 0542500 58.7493 358.0000 14.74000000 05 It is my hope that the above will help to reduce the observation time required to recover the object. Ted Molczan _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sat Aug 28 2021 - 09:03:02 UTC
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