Re: USA 276 (some thoughts on recent manoeuvering)

From: Leo Barhorst via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 18 Jul 2017 18:17:34 +0200
Marco Langbroek wrote:
... and the two days before that (Jul 15 and 16) it made similar close
passes to
ISS debris objects A, B, C and D.

Objects A-D are most likely Cubesats deployed from ISS.

Leo


2017-07-18 16:51 GMT+02:00 Marco Langbroek via Seesat-l <seesat-l_at_satobs.org
>:

> 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 - 11:18:12 UTC

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