Two extra orbit variants (Re: NROL-47 search elset and identity)

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 10 Jan 2018 14:55:22 +0100
Op 9-1-2018 om 17:57 schreef Marco Langbroek via Seesat-l:

> Here is an orbit estimate for launch on 10 January 20:30 UT:
> 
> NROL-47  launch 2018-01-10 20:30 UT                    1495 x 1505 km
> 1 70000U 18999A   18010.85416667  .00000000  00000-0  00000-0 0    09
> 2 70000 108.6398 105.5134 0006347 166.4011 308.2684 12.41559515    01
> 
> Here is an alternative orbit for an 1100 km orbital altitude (FIA, but in a
> different orbital plane):
> 
> NROL-47  launch 2018-01-10 20:30 UT                    1100 x 1110 km
> 1 70001U 18999A   18010.85416667  .00000000  00000-0  00000-0 0    00
> 2 70001 108.5831 105.5134 0006682 166.4011 304.1188 13.41149813    06



Here are two extra variants that assume initial launch into a 108.6 deg inclined
orbit, and next an inclination changing manoeuvre at first nodal crossing, into
a 123.0 degree inclined orbit:


NROL-47 alt1    launch 2018-01-10 20:30 UT             1495 x 1505 km
1 70002U 18999A   18010.86875000  .00000000  00000-0  00000-0 0    02
2 70002 123.0000 105.5257 0006347 179.9597 359.9483 12.41559515    05

NROL-47 alt2    launch 2018-01-10 20:30 UT             1100 x 1110 km
1 70003U 18999A   18010.86564815  .00000000  00000-0  00000-0 0    01
2 70003 123.0000 105.5421 0006682 180.0080 359.9441 13.41149813    04


This would place the satellite close to the FIA Radar 1 orbital plane, with a
5.5 degree difference in RAAN.

Changing the RAAN in the above elsets to ~100.0 degrees would place the
satellite exactly in the FIA Radar 1 orbital plane.

I hope I made no mistakes in constructing the above elsets by the way.

- Marco



-----
Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
e-mail: sattrackcam_at_langbroek.org

Cospar 4353 (Leiden):     52.15412 N, 4.49081 E (WGS84), +0 m ASL
Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
Station (b)log: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
-----
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Received on Wed Jan 10 2018 - 07:56:16 UTC

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