Re: ISS follower

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Sun Sep 29 2002 - 05:09:59 EDT

  • Next message: Tony Beresford: "Sep 28 observation"

    Well, this is interesting.  Ed Light wrote:
    
    >After the previous postings regarding a bright object 
    >following ISS, I waited a couple of hours hoping more 
    >recent TLEs would clear up any mystery. Unfortunately, 
    >all they did was extend my confusion.
    
    Jay Respler wrote:
    
    >ISS was about mag -2 to -4.  Progress M1-9 just about 
    >as bright as Altair. Very nice seeing them glide along 
    >together.
    >QUICKSAT output:
    >
    > 40.281  74.235  129.   JAY RESPLER              1950 29.0  4 F F T T T
    > ***  2002 Sept 28  Sat evening  *** Times are PM EDT  ***  1933  6 2
    > H  M  S Tim Azi ElC Dir  Mag Dys F  Hgt Shd  Rng  R A  Dec  Name
    > ...
    > 7 57 59  .0 143 85C 271  1.5   0 3  247 105  248 1945 35.6  ISS
    > 7 58 31  .0 143 86C 271 18.6   0 3  247 104  247 1943 36.4  PROGRESS M1-9
    
    First, I misread the SpaceflightNow story and thought that 
    the new Progress was docking to ISS on Saturday.  Second, 
    due to a not too favorable pass, my predictions for the 
    evening did not include the Progress, so that "confirmed" 
    that they had docked!  A while ago I generated predictions 
    trying to find what object was trailing ISS, and I got the 
    following -- which look like Progress had already docked 
    with ISS (!):
    
      30.315  97.867  940.   BCRC, Austin, Texas      2000  8.0 10 F F T T T
    ***  2002 Sept 29  Sun morning  *** Times are AM UTC  ***   1 3 1140
    
     H  M  S  Tim Al Azi C Dir  Mag Dys F  Hgt Shd  Rng  EW Phs  R A   Dec
    
    27531 Progress M1-9 
     1 28 35   .0 21 323 C  91 21.7   0 3  244 178  579 1.4 121 13 3  55.4
     
    25544 ISS            98 67A                69  -1.5 Intl Space Stn  
     1 28 35   .0 21 323 C  91   .2   0 3  244 178  579 1.4 121 13 3  55.4
    
    I'm pretty sure that the elements that produced the above 
    predictions were:
    
    ISS               20   10    0 0.5               398 x 375
    1 25544U 98067A   02271.81083306  .00046362  00000-0  55462-3 0  1966
    2 25544  51.6350 252.7150 0017315 311.9377 127.1786 15.60330796220198
    Progress M1-9                                    399 x 375
    1 27531U 02045A   02271.66574074  .00044009  00000-0  52708-3 0   207
    2 27531  51.6363 253.4362 0017625 311.1822  32.3886 15.60317194   465
     
    So, I wasn't looking for anything following ISS, and while 
    I watched it without binoculars didn't see the Progress 
    behind it by accident.  What bad luck!  (The pass was 
    pretty low in the NW.)
    
    The two latest elements sets I got from OIG a little while 
    ago are:
    
    ISS (ZARYA)
    1 25544U 98067A   02272.13439256  .00034926  00000-0  41973-3 0  1999
    2 25544  51.6345 251.0860 0017451 312.8670 144.9477 15.60341912220241
    PROGRESS M1-9
    1 27531U 02045A   02272.26351691  .00361332  00000-0  41061-2 0   268
    2 27531  51.6424 250.4499 0015352 315.1091 146.5779 15.60457010   560
    
    Is there any official report from the Russians about the 
    maneuvering of the new Progress?
    
    My consolation prizes were, among other things, a bright 
    Topex pass and seeing several flaring geosats, including 
    again the two pair (all Panamsats, 23764, 25585, 24916, 
    and 26608) easily visible for a few minutes in my 10x50s.
    Also, using binoculars I did see the old Progress (27454).
    
    Ed Cannon - ecannon@mail.utexas.edu - Austin, Texas, USA
    
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