RE: Obs 20 Nov 2003

From: Ted Molczan (molczan@rogers.com)
Date: Fri Nov 21 2003 - 05:26:33 EST

  • Next message: Russell Eberst: "NOV20-21.OBS"

    Greg Roberts wrote:
    
    > (1) Not a night I normally track but after receiving a possible
    > circular orbit from Mike McCants for my unknown  of 18th November
    > I decided to give it a go and observed it running about 2 minutes 
    > early on the possible orbit so this looks like an UNKNOWN that has
    > not escaped further observation so we should now be able to get a 
    > good orbit. I have called the object 03 322A in the data above - dont 
    > know if this is the correct way of naming an unknown.  I guess that my 
    > excitement at discovering a "new" satellite will be burst in a few
    > days time when it is finally linked to a known tracked object as 
    > its too bright to have escaped detection if it was a real unknown.
    
    I noticed Wednesday that the object's orbital plane was very near one
    inhabited by Earth resources and environmental satellites, such as
    Spot, Adeos and ERS, so I suspected it was one of those, having made a
    manoeuvre subsequent to the most recent elset in the Sunday alldat file.
    
    I tried to guess which one manoeuvred, on the assumption that it must
    have been one of those still active. I downloaded fresh elsets for
    several recent Spots, nut none had manoeuvred.
    
    I resolved to send you and Mike an e-mail stating my hunch, and to
    re-check the object's identity when I received the Thursday alldat file.
    
    Alas, I forgot to do both. Your message this morning reminded me, so
    I quickly re-ran your original observation through IDSat, against 
    the Thursday alldat, and as suspected, it was a Spot that manoeuvred,
    but I would not have believed that it was the ancient Spot 1!
    
    SPOT 1
    1 16613U 86019A   03323.76430856 -.00000043 +00000-0 +32694-6 0 08954
    2 16613 098.6658 035.3665 0009346 257.9074 102.1039 14.24176673605148
    SPOT 1
    1 16613U 86019A   03322.85098448 -.00003242 +00000-0 -13888-2 0 08922
    2 16613 098.6662 034.4649 0009171 260.8768 099.1366 14.24172250605015
    03822A
    1 99991U          03322.85099471  .00000000  00000-0  00000-0 0    03
    2 99991  98.4000  34.7723 0001000 301.4233  58.5766 14.25000000    02
    SPOT 1
    1 16613U 86019A   03321.86741171 -.00000937 +00000-0 -38759-3 0 08888
    2 16613 098.6595 033.4998 0007919 270.0833 089.9558 14.24167655604876
    SPOT 1
    1 16613U 86019A   03320.81137000 +.00000618 +00000-0 +31030-3 0 08847
    2 16613 098.6671 032.4583 0001140 048.8826 311.2451 14.20074003604720
    SPOT 1
    1 16613U 86019A   03319.82494909 +.00000722 +00000-0 +35915-3 0 08808
    2 16613 098.6663 031.4894 0001356 043.3352 316.7925 14.20073192604586
    SPOT 1
    1 16613U 86019A   03316.72476443 +.00000160 +00000-0 +95577-4 0 08703
    2 16613 098.6699 028.4535 0001368 052.7692 307.3604 14.20071248604149
    
    Since it manoeuvred from the standard 14.2 rev/d Spot orbit to a lower
    one, I suspect it is finally being removed from service.
    
    Had I been better organized, I might have saved you some search time.
    Still, it was not entirely a wasted effort, since it serves as a test
    and demonstration of your ability to recover unknowns. And with your
    additional tracking, it would have been easy to determine which object
    manoeuvred, even without an alldat update.
    
    > Please accept my apologies for the shambles with my SeeSat 
    > postings over the past two days - I have not yet had a chance 
    > to see where the problem is taking place with my messages to 
    > SeeSat being returned to me but still appearing on SeeSat -- 
    > I am beginning to suspect its my server who continually seems 
    > to mess up my mail with its anti-spam system --- so far all 
    > it seems to have done is reject my mail and let the spam through!
    
    No need to apologise. I strongly suspect that the ISP of one of our
    subscribers has installed some overly aggressive anti-spam software
    that cannot differentiate between a mailing list and spam. What is
    unusual, is that the bounced messages are not only being sent to me,
    the SeeSat-L admin, but to those who posted the bounced message.
    
    I am working to resolve the issue.
    
    Ted Molczan
    
    
    
    
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