NOSS 3-8 imaged this morning, March 2 at 4h18m UT

From: Alain Figer via Seesat-l <>
Date: Thu, 2 Mar 2017 13:25:22 +0100
Hi all,

Through rather poor skies (naked eye limiting mag 3) I managed to
photograph the pass of NOSS 3-8 in Cassiopeia, using a Canon EOS 6D + 200mm
teleobjective at f/2.8 (field 11° x7°).
37 photos taken in 2 fields do show both satellites ; each image being of
3.2 s exposure at 1250 ISO.
The culmination was predicted by Calsky at 4h15m59s UT ; h: 26°8 NNW.

Using binoculars 10x50 I also detected visually the brighter component at
about mag 5- 5.5 near Iota Cas. It was already fainter near Alfa Cas due to
phase angle and lower height above horizon.
This suggests a possible standard magnitude of 3.5- 4 for the brighter

The leader was the fainter component, being about 1.5 -  2 mag fainter than
the follower, what is about mag 7.

Both objects were close to each other. The bright follower was 1.7 second
late in respect to the faint leader.

With Ted Molczan elements for 17060.82372686, I found that the bright
follower was 12.6 seconds early using the Calsky ephemeris for object
2017-951-A  (or 13.4 seconds early using  a Guide ephemeris computed by my
friend in Meudon using the same elsets).

The main measurement was done using the appulse to HD 5408 (a bright
neighbour of Gamma Cas)

Observed at : 4h18m14.7s UT
Calsky prediction : 4h18m27.3s UT.
O-C = -12.6 s.

My friend noticed the launch did happen at  17:49:51 according to ULA, what
is 9 s before the timing (17:50:00) that Ted Molczan had hypothetized for


Alain Figer
48.6727° N ; 2.1282° E ; 168 m a.s.l.
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Received on Thu Mar 02 2017 - 06:26:24 UTC

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