Re: Flock 2B 2 (40951) Reentry Seen from Southern England, UK

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 3 Oct 2016 13:38:04 +0200
William shared the video, and from it I obtained the following measurements:

99999 16 776A   9004 G 20161002184350520 17 25 1711401+162553 39 S
99999 16 776A   9004 G 20161002184351520 17 25 1724505+163473 39 S
99999 16 776A   9004 G 20161002184352520 17 25 1736750+164397 39 S
99999 16 776A   9004 G 20161002184353520 17 25 1750216+164502 39 S
99999 16 776A   9004 G 20161002184354520 17 25 1804428+163487 39 S
99999 16 776A   9004 G 20161002184355520 17 25 1818432+162045 39 S
99999 16 776A   9004 G 20161002184356520 17 25 1831986+155650 39 S
99999 16 776A   9004 G 20161002184357520 17 25 1846594+152635 39 S
99999 16 776A   9004 G 20161002184358520 17 25 1901101+145608 39 S
99999 16 776A   9004 G 20161002184359500 17 25 1914563+141116 39 S
99999 16 776A   9004 G 20161002184400520 17 25 1928409+132422 39 S
99999 16 776A   9004 G 20161002184401520 17 25 1940494+123416 39 S
99999 16 776A   9004 G 20161002184402520 17 25 1951782+113908 39 S
99999 16 776A   9004 G 20161002184403140 17 25 1957107+110316 39 S

Fitting a circular orbit gives this result.

1 99999U 16776A   16276.78051887  .00000000  00000-0  50000-4 0    00
2 99999  51.7221 184.2405 0001000   0.0000 100.3776 16.66450838    01
# 20161002.78-20161002.78, 14 measurements, 0.478 deg rms

Clearly it fits the ISS inclination, though the RAAN is at least 2 deg
smaller. Since the field-of-view of the camera was 100x55 deg, there
likely is unmodelled distortion, resulting in systematic offsets in
the positions.

Regards,
    Cees
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Received on Mon Oct 03 2016 - 06:38:53 UTC

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