Re: Decay watch: Cosmos 2335

Björn Gimle (b_gimle@algonet.se)
Thu, 10 Dec 1998 23:25:39 +0100

>
>OIG has published a decay prediction for Cosmos 2335 giving a predicted
>decay on December 14 @ 15:15 UTC +-3 days.
>
>Cosmos 2335 was manoeuvring frequently near a 421x400 km orbit until
>December 6 when successive elsets showed a major reduction in perigee:
>Cosmos 2335      6.0  0.0  0.0  4.2 v            421 x 400 km
>1 24670U 96069A   98340.97889474  .00004242  00000-0  74011-4 0   629
>2 24670  65.0319   4.2647 0015894 297.2841  62.6685 15.52162311112585
>Cosmos 2335      6.0  0.0  0.0  4.2 v            415 x 224 km
>1 24670U 96069A   98342.07152778 -.03305865  26667-2 -65473-2 0   643
>2 24670  65.0278   0.5541 0142686 270.7018  89.9356 15.83951587112754
>
>The latest elset is:
>Cosmos 2335      6.0  0.0  0.0  4.2 v            409 x 226 km
>1 24670U 96069A   98343.52403950  .01730209  13974-2  35472-2 0   806
>2 24670  65.0366 355.4141 0136731 272.0974  86.4427 15.84597456112988
>
The new orbit is very similar to previously de-orbited EORSATs, which have
taken about two months to decay. There are some variations, as can be seen
in the linked data and graphs on my www.algonet.se/~b_gimle/eorsat.htm
page: some have decayed more slowly than normal satellites, probably due
to the on-board correction engine; some have decayed slowly for a few
weeks, then normally. In many cases have the first elsets after the
first MM increase shown sudden changes and unstable drag terms.

Björn Gimle