NOSS 3-5 pair have manoeuvred higher

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 20 Dec 2015 18:35:19 -0500
Last night, Brad Young observed the NOSS 3-5 pair running late:

http://satobs.org/seesat/Dec-2015/0119.html

Tonight, David Hopkins reported off-list, that he observed them running 77 s late.

Below are updated elements based on Brad and David's observations.

NOSS 3-5 (A)                                           1092 X 1120 km
1 37386U 11014A   15354.73494404  .00000000  00000-0  00000-0 0    00
2 37386  63.4395 321.4137 0019000  24.2612 335.9303 13.40577202    04
Arc 201512191-1220.75 WRMS resid 0.096 totl 0.093 xtrk

NOSS 3-5 (B)                                           1090 X 1122 km
1 37391U 11014B   15354.73486031  .00000000  00000-0  00000-0 0    03
2 37391  63.4388 321.2339 0021000  19.6873 340.4958 13.40580148    04
Arc 201512191-1220.75 WRMS resid 0.127 totl 0.127 xtrk

This was a small manoeuvre up from the current constellation-wide standard mean motion of ~13.4069 rev/d, but much
larger than usual.

Earlier in tonight's session, David found NOSS 3-6 (12048A and P) a no-show, which probably means that it too has gone
higher. Historically (over decades), the very gradual rate of decay of operational NOSS has been managed, so that all
maintain nearly the identical mean motion. Therefore, it is reasonable to guess that all have, or will soon, manoeuvre
higher. Whether 13.4058 rev/d is their new standard mean motion is unknown.

The recently launched NOSS 3-7 pair (15058A and Q) had been drifting relative the constellation, with mean motion
13.4100 rev/d, pending arrival at the optimal position relative the others.

Ted Molczan


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Received on Sun Dec 20 2015 - 17:36:16 UTC

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