Re: USA 276 (some thoughts on recent manoeuvering)

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 18 Jul 2017 16:51:39 +0200
Op 18-7-2017 om 15:30 schreef Marco Langbroek:
> There is evidence that the object has been making small manoeuvres the past
> days. Attempts to fit over multiple days show that some days lead to large
> residuals.


I wonder if this manoeuvering has to do with the fact that USA 276 has made
close passes to a number of recent ISS "debris" objects the past days.

Yesterday 17 July for example, it made a close pass to ROSA (42813, 98-067MT),
the jettisoned ISS solar array, coming to about 14 km of it:

DATE		UT		OBJ	NAME		KM
7/17/2017	08:37:28	42813	ISS DEB (ROSA)	189.5
7/17/2017	09:23:14	42813	ISS DEB (ROSA)	127.3
7/17/2017	10:09:52	42813	ISS DEB (ROSA)	142.7
7/17/2017	10:55:46	42813	ISS DEB (ROSA)	 80.2
7/17/2017	11:42:17	42813	ISS DEB (ROSA)	 96.2
7/17/2017	12:28:18	42813	ISS DEB (ROSA)	 33.3
7/17/2017	13:14:42	42813	ISS DEB (ROSA)	 50.3
7/17/2017	14:00:50	42813	ISS DEB (ROSA)	 14.5
7/17/2017	14:47:06	42813	ISS DEB (ROSA)	 13.6
7/17/2017	15:33:22	42813	ISS DEB (ROSA)	 61.0
7/17/2017	16:19:31	42813	ISS DEB (ROSA)	 46.9
7/17/2017	17:05:55	42813	ISS DEB (ROSA)	107.8
7/17/2017	17:51:56	42813	ISS DEB (ROSA)	 92.5
7/17/2017	18:38:27	42813	ISS DEB (ROSA)	154.6
7/17/2017	19:24:22	42813	ISS DEB (ROSA)	138.6
7/17/2017	20:10:59	42813	ISS DEB (ROSA)	201.3
7/17/2017	20:56:47	42813	ISS DEB (ROSA)	184.9

... and the two days before that (Jul 15 and 16) it made similar close passes to
ISS debris objects A, B, C and D.

So this manoeuvering could have been avoidance manoeuvering and/or perhaps (but
this is speculative) also manoeuvering to position for a closer look at e.g. ROSA.

- Marco


-----
Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
e-mail: sattrackcam_at_langbroek.org

Cospar 4353 (Leiden):     52.15412 N, 4.49081 E (WGS84), +0 m ASL
Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
Station (b)log: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
-----
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Received on Tue Jul 18 2017 - 09:52:20 UTC

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