About searching for Zuma

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 13 Jan 2018 22:53:38 +0100
Hi all,

I see some misunderstandings popping up, where it appears that (apparent) short
searches based on predictions from my search TLE's, lead to too quick
conclusions that as nothing was observed, Zuma must not be in orbit.

My TLE's are rough indications only. The orbital plane is probably allright, but
exact orbital altitude and Mean Anomaly are much less clear. So with that, large
deviations in pass time (plus, adding other uncertainties, cross-track error)
cannot be ruled out.

So what is needed is a full planar search. We should not be too quick in
judgement that since it is not seen around a predicted pass time based on a very
rough TLE estimate, it is not there.

Maybe I should have been more clear on this myself, Mea Culpa.

- Marco

PS: after a very cloudy day, skies have cleared here, but too late alas for both
Zuma and NROL-47.

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 Sat Jan 13 2018 - 15:54:59 UTC

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