Decays, + Re: 19 Aug 97 Iridium Launch Elset (prelim)

Bjoern Gimle (bjorn@tt-tech.se)
Mon, 18 Aug 1997 12:26:43 +0200

According to Ron Lee's preliminary orbit, the new Iridiums are initially
completely sunlit, but will move into shadow at Australian latitudes
in 2.5 days.
So, it should have best visibility initially in the southern hemisphere.

Increasing altitude of SeaStar/OrbView-2 has not kept up with the Earth
tilting its northern hemisphere away from Sun, so shadow exit has moved
a
little north. No new elset at OIG, still 15.53 MM . If it reaches its
700 km 14.58 Mean Motion this Sunday, it will be sunlit from latitude 53
N

SeaStar / OrbView-2                              418 x 394 km
1 24883U 97037A   97229.20624969  .00009077  00000-0  14251-3 0   303
2 24883  98.2687 325.7005 0017448 199.0970 160.9641 15.53786224  2426

Here are also visibility conditions for the two Cosmos satellites
in the decay phase :

        Entry    NB/SB     Exit   NB/SB   Decay

#20389   43 S     NB        53 N     NB    Sep.04
#23676   63 N     SB        82 S           Aug.21
#24883   80 S     NB        57 N     NB
#24901*) 44 S     NB        36 S     NB

*) New Iridium, first shadow contact, 970820 at 13:19 UT

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