USA144 and NOSS obs

Tristan Cools (
Sat, 16 Oct 1999 22:54:45 +0100


I observed the USA144 payload(99-28A/25744) for the first time this
evening(Oct 16 19:30UTC at Ryckevelde) and was surprised it was in slow
tumble.  I measured two tumble periods in 4m31s with the first period
beeing 2m27s.  The maxima reached about mag +3.5 and was very flat during
more than 15s.  Minima were much shorter and invisible so I would describe
this in PPAS format as M'_M'.

Does someone have any thoughts about this payload ?  It doesn't seem to be
a SDS payload, or did it fail to move to its operational(Molniya like) orbit ?

Another observation is this of a NOSS cluster 1990-50CDE at 18:35UTC.  At
first I thought one object was missing but it was just much fainter than
the other two.(see triangle)


	*(m3.5)		*(m3.5)

This is my second observation of this cluster with two objects beeing
brighter than the other two except that the observation from this evening
was much extremer.


Tristan Cools
Belgian Working Group Satellites(BWGS)

Damse Vaart: 3.2478E/51.2277N
Ryckevelde:  3.2856E/51.2045N
Brugge:      3.2166E/51.2104N

Unsubscribe from SeeSat-L by sending a message with 'unsubscribe'
in the SUBJECT to