Re: OTV 6 preliminary TLE

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 18 May 2020 13:41:48 +0200
Allow me to expand on Nico's message.

Passive radio observations of OTV 6 have been obtained on three
passes, the first directly after launch, the other two earlier today.

Fitting a circular orbit to all three passes; fitting for mean
anomaly, RA of the ascending node, mean motion as well as inclination,
yields the following orbit:

OTV 6 (3 passes)                                          390 x 392km
1 84001U          20139.01686850  .00000000  00000-0  50000-4 0    04
2 84001  44.9398 319.5572 0001000   0.0000 107.1462 15.59403495    01

Though it is expected that OTV 6 was inserted into its orbit around or
before the first pass directly after launch, excluding it and only
using the two passes of today yields:

OTV 6 (2 passes)                                          391 x 392km
1 84002U          20139.01686850  .00000000  00000-0  50000-4 0    05
2 84002  44.9655 319.7503 0001000   0.0000 107.1197 15.59340098    08

The two orbits are very similar and indicate an orbital altitude of
390 km (under the assumption of a circular orbit) at 45 degree
inclination.

Currently, these orbits predict visibility near the equator though
evening visibility for Northern hemisphere observers will improve over
the next few weeks.

The designation of OTV 6 has not yet been released by space-track.org,
and given some confusion about cubesats being deployed from Cygnus
NG-13, I use temporary designations.

Regards,
   Cees
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Received on Mon May 18 2020 - 06:43:02 UTC

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