Re: Object preceding MIR

Alan Pickup (alan@wingar.demon.co.uk)
Mon, 13 Apr 1998 08:54:07 +0100

I am convinced that #25294 = 86- 17 MQ is the VDU external thruster
pushed overboard from Mir at 12:35 UTC on April 11, and that this is the
object seen drawing ahead of Mir over the past day.

Starting with Mir's orbit at the time the VDU was released, I can
generate an orbit which satisfies the eight published elsets for #25294
with a mean error of 0.16 sec (max residual 0.7 sec). The first elset
for the latter was:
Mir deb MQ                                       380 x 374 km
1 25294U 86017MQ  98101.70486764  .01062569  00000-0  10135-1 0    19
2 25294  51.6576  22.9885 0004865 234.6222 125.5088 15.63759752    12
which showed it preceding Mir by 2.5 sec 4 hours after the release.

In message <Chameleon.892447587.jhunt@news1.radix.net>,
jeff@satellite.eu.org writes
>April 13, 01:39 UT
>Yes, IMO, an uncataloged object (mag 5 to 6) 15-20 seconds preceding Mir. 
>Observed just before entering shadow. Checked OIG a couple of hours ago 
>and they hadn't released a new element beyond NORAD 25294. Maybe the 
>released VDU?

#25294 would have been about 22.5 sec ahead of Mir at this time.

>--- On Sun, 12 Apr 1998 17:10:16 -0400  karcher 
><101672.3140@compuserve.com> wrote:
>> Got a bright satellite  19.60 SEC before MIR. Seen between clouds for
>>about 15 sec , mag +4.4 , seems invariable.
>> This object  and MIR ( mag -1 ) were timed  at 19H28M25.07S and
>>19H28M44.67S respectively , both about 4  deg below 60 LEO ( 65degSE)
>> APRIL 12  , UTC
>>Dan Karcher   7.3417 E , 47.4833N

I calculate that #25294 would have been about 19.0 sec ahead of Mir
during this pass.

Alan
-- 
 Alan Pickup | COSPAR site 2707:   55d53m48.7s N   3d11m51.2s W    156m asl
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