RE: NROL-55 search elements

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 8 Oct 2015 09:22:36 -0400
Lift-off was at 12:49:30 UTC - 30 s later than the basis for my estimated TLEs. Since the difference is likely to be
within the margin of uncertainty for observers tonight, it is not necessary to revise them.

NOSS 3-7                                               1013 X 1200 km
1 79701U          15281.61469908  .00000000  00000-0  00000-0 0    07
2 79701  63.4283 292.5778 0124892 180.5274 352.9095 13.40429195    06

Centaur final orbit                                      459 X 775 km
1 79702U          15281.65902778  .00000000  00000-0  00000-0 0    09
2 79702  64.6863 291.3514 0225821 294.8437 113.6381 14.83391172    04

The above are derived from the NOSS 3-6 launch. Twenty-four hours after launch, allow for at least several minutes time
error, and several degrees of track error on high elevation passes.

In the northern hemisphere, the NOSS orbit will be well-placed for all night observation. Southern hemisphere observers
will have evening visibility, but near twilight.

Based on the current forecast, I expect to be clouded out tonight.

I expect to be unavailable for orbit analysis from roughly 20:00 UTC to 00:00 UTC.

Ted Molczan


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Received on Thu Oct 08 2015 - 08:23:27 UTC

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