Mark Hanning-Lee wrote:
>
Hi Mark,
> Cool! Good luck with the events.
I will definitely set my gear up for possible photos. I am not
optimistic since it will not be as dark as I would like and I have yet to
acquire a satisfactory CCD device.
> Note: if your prediction shows a transit by Soyuz-TM-32/Progress M1-6
> but NOT by ISS, then you have different elsets for things that are
> actually docked together. In which case one elset is wrong, and we must
> wonder which is correct. I usually go by the elset of the biggest
> component, ISS.
I also find this amusing as I would have expected the two to be in
hand-in-hand ... either both or none. My elset for Souyz reads as follows:
SOYUZ TM 32 : 8 x 3
1 26749U 01017A 01170.84182694 .00023886 00000-0 26815-3 0 654
2 26749 51.5695 75.2606 0016447 182.2879 177.7802 15.62349582 8214
whereas for the ISS I have
ISS : 20 x 10
1 25544U 98067A 01172.14846569 .00046042 00000-0 50686-3 0 1169
2 25544 51.5715 68.6551 0016883 186.4473 328.1006 15.62493694147692
It is obvious from the above that the elset for the ISS is just over a day
more recent which raises a potential warning flag for the Soyuz module.
Nevertheless, I am still somewhat surprised as both elsets are quite fresh.
> (This used to happen with Mir: Mir and the KVANTs often had different
> elsets. Predictions of MIR passes were correct, predictions of KVANT
> passes were wrong.)
Which gets back to the obvious question about elsets being forced to be the
same since we are talking about the same entity.
> Why can't OIG keep track of this? It would seem a simple analyst
> operation: If ISS is docked to Soyuz-TM-32/Progress M1-6, then force
> elsets to be the same.)
Precisely. Only NASA knows .... :-)
> Mark
Anthony.
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This archive was generated by hypermail 2b29 : Thu Jun 21 2001 - 12:26:10 PDT