The NRO has announced that the planned time of launch on September 24, 2022 is 21:53 UTC. The NOTAMS will define the search orbit. In the meantime, here are a couple of possibilities based on the two previous launches in the series. If NROL-91 will be a repeat of NROL-71 that launched USA 290, then this would be its orbit a few hours after launch: 371 X 401 km 1 91998U 22268.09177083 .00004051 00000-0 50000-4 0 03 2 91998 73.6550 44.3683 0021663 129.3014 281.4976 15.59730744 02 The RAAN would be 89.7 deg east of USA 290. That happens to be close to my earlier guess of 90 deg east. The above is derived from elements that Scott Tilley produced from radio observations of USA 290: 1 74008U 19019.97857950 .00004051 00000-0 50000-4 0 01 2 74008 73.6550 118.7967 0021663 129.3014 281.4976 15.59730744 06 If NROL-91 will be a repeat of NROL-82 that launched USA 314, then this would be its orbit a few hours after launch: 519 X 758 km 1 91999U 22268.10354167 .00000438 00000-0 50000-4 0 01 2 91999 98.0546 35.4062 0169852 86.6649 330.9798 14.76209142 06 The above is derived from elements that Cees Bassa produced from optical observations of USA 314: 1 99596U 21117.05771367 .00000438 00000-0 50000-4 0 03 2 99596 98.0546 230.2670 0169852 86.6649 330.9798 14.76209142 07 Ted Molczan _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Fri Sep 16 2022 - 20:36:51 UTC
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