Atlas V and Landsat 9 visibility during launch phase

From: C. Bassa via Seesat-l <>
Date: Mon, 27 Sep 2021 11:36:21 +0200
An Atlas V 401 is scheduled to launch Landsat 9 from Vandenberg AFB at
18:12UTC today into a 666x679 km sun synchronous orbit. A few cubesats
will also be released afterwards in a slightly different orbit.

The mission overview
places the Landsat 9 separation over Belarus at 1h20m40.4s after
launch, which would correspond to 19:32:40.4UTC for an on time launch.
The final 25 second de-orbit burn over the UK starts at 2h57m44.1s
after launch, corresponding to 21:09:44.1UTC.

Both these events happen at most one or two minutes before shadow exit
and hence may be visible from Northern Europe.

Here is a very rough guess for the Landsat 9 deployment orbit:
1 85001U 21270.75833333 .00000000 00000-0 50000-4 0 03
2 85001 98.2200 336.0000 0009077 0.0000 115.0000 14.66327431 06

Note that the cubesats may be deployed in a lower orbit, so the
de-orbit burn may be early with respect to this TLE.

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Received on Mon Sep 27 2021 - 04:37:38 UTC

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