Bright geoflasher "conjubction" on the 14th December 1999

Jason Hatton (
Mon, 13 Dec 1999 10:40:29 +0100 (MET)

I tried sending this message to the list yesterday, but it did not appear
to have arrived. Here is the message again.

Hi everyone,
		An interesting observing opportunity for european observers
will present
itself on the evening of Tuesday 14th December 1999. The bright flashing
geostationary satellite Gorizont 23 will pass within 1/2 a degree of Raduga
27, which is also a bright geoflasher, as it drifts slowly westerwards.
Closest approach will be around 18:30UT, 14th Dec 1999, although both
satellites will be in the same low power field of view throughout the
evening. Both satellites are currently flashing as brightly as mag+5 or
mag+6, so may be visible in binoculars.

	Gorizont 23's period is currently around 51s and decreasing, whilsts
Raduga 27's last reported period was 76s and increasing. I glimpsed Raduga
27's flashes using 10x50 binoculars from where I work last week, but did
not manage to get a timing due to the sudden arrival of clouds.

Here are recent elements for both satellites;

Raduga 27
1 21132U 91014A   99340.92455549 +.00000115 +00000-0 +00000-0 0 02802
2 21132 005.5053 066.3636 0005340 200.0200 159.7175 01.00281209032154
Gorizont 23
1 21533U 91046A   99341.81964626 +.00000065 +00000-0 +10000-3 0 01922
2 21533 004.9808 064.0393 0006952 126.7859 233.0105 00.98906043024908

If you do manage to get timings of either satellites flash period please
send your observations to the BWGS flash period database;

Best wishes & clear skies,


Jason P Hatton
06200 Nice

43.692N, 7.246E,30M

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