Re: Mir Marathon

Bjoern Gimle (b_gimle@algonet.se)
Sun, 7 Sep 1997 10:40:56 +0200

> 
>Dave Mullinex wrote:
>> I wonder how many passes could be seen in 24 hour period.
Bram Doreman wrote:
> 
> According to my intuition a (northern hemisphere) observer can
> see the greatest number of consequtive Mir passes when he is at
> a location so that Mir has its most northerly point in its orbit
> at the observers northern horizon.
>... 
> I leave calculations to other involved people but I am
> curious to read what they derive.
> 
It has been posted by someone on SeeSat-L about half a year ago ?
Either an odd number of passes, with a northern apex pass due
North at midnight ( in summer, so it is sunlit ), or an even
number, with passes 47 minutes before and after midnight near N.
(apex may be slightly shadowed, observer a few km more south,
and local darkness may be longer) Preferably apogee at N. apex also.

Use any prediction program to verify visibility.

This is not Mir, but 7 passes of the Russian rocket Sep.23 :

  59.224 -18.228   44.   Tyres"                   2000 19.9  0 F F F F T

***  1997 Sept 24  Wed evening  *** Times are PM MST  ***  1953  524
 
 H  M  S  Tim Al Azi C Dir  Mag Dys F  Hgt Shd  Rng  EW Phs
 
97025 FaiSat-2v Rk                                N 3.5 
19 12 24   .0 49  93 C 272  4.4   1 4 1027 897 1296  .7  44
 
20 58 27   .0 49 296 C  92  5.3   1 4 1027 904 1294  .7 112
 
22 46  4   .0 17 320 C  91  7.8   1 4 1028 923 2319  .5 134
 
***  1997 Sept 25  Thu morning  *** Times are AM MST  ***  1953  524
 
 H  M  S  Tim Al Azi C Dir  Mag Dys F  Hgt Shd  Rng  EW Phs
 
 0 35  3   .0  8 348 C  90  9.6   1 5 1029 956 2963  .5 138
 
 2 24 49   .0 10  20 C  90  9.3   1 5 1029 993 2854  .5 140
 
 4 13 28   .0 22  47 C  89  7.4   1 6 10281013 2047  .5 137
 
 6  0 39   .0 69  71 C  88  4.7   2 6 10271020 1091  .8 105

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