Re: Irid 25 head-on with another sat

From: Jim Nix (nixj@bellsouth.net)
Date: Sun Sep 16 2001 - 15:59:10 EDT


Denis,

    Running skymap I show 13367, Landsat 4, as passing head on with Ir 25.  They would have
been at closest proximity, about one degree from each other, going in opposite directions at
22:00:08 Moscow time.  Used the following elsets which are a few days old:

Landsat 4
1 13367U 82072A   01257.19220313  .00003464  00000-0  33966-3 0  9374
2 13367  98.2599 322.2956 0010955  42.8346 317.3722 14.92915760 19740
Iridium 25
1 24904U 97043B   01257.21504859  .00000029  00000-0  34445-5 0  6376
2 24904  86.4015 140.4899 0002108  60.5740 299.5669 14.34216925212955

Clear and Dark Skies-----------------------------------------------------------------------
Jim Nix         |  Raleigh Springs #8936  35.2131N 89.9354W, 90m,-5.0 GMT
                     |  Lim Mag 6.0, Partly cloudy
---------------------------------------------------------------------------------------------


"Denis V. Denissenko" wrote:

> Hello list,
>
> Was waiting for -8 mag flare from Iridium 25 when another satellite of
> about 3rd magnitude appeared which was moving in opposite direction.
> There was almost head-on encounter shortly before the peak of flare,
> that is aroung 22:00:00 MSK (UT+0400).  The flare itself occured as
> predicted by Iridflar and H-A at 22:00:40.  After checking out
> heavens-above predictions for all satellites brighter than 4.5 the only
> similar match to the other object was Cosmos 2219 Rocket (3.4 mag), but
> it should have passed between Anromeda and Perseus at 22:03-22:04, i.e.
> 4 minutes later.  Could it be possible that H-A elements for this rocket
> (ID 22220) are off, or was it another object?  If yes, can somebody
> identify it?
>
> By the way, the encounter was accompanied by some plane which crossed
> the track of the first satellite.  Unfortunately I didn't set up my
> camera and missed a great photo opportunity...
>
> Denis
>
> 55o45'N 37o37'E
>
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