Re: Your request on Seesat-l

From: Bill Gray via Seesat-l <>
Date: Thu, 8 Sep 2016 13:57:11 -0400
Hi Jari,

    Thank you.  I had the third set of TLEs from that page,  via
Jonathan,  for 1977 182 = 1977 July 1.  The fourth set,  "possibly
sample",  for 74 days later,  might come in handy.

    At this point,  I'm hoping the object gets observed again in a few
days;  that will refine the orbit a bit,  to the point where it may
conceivably appear in archives,  giving us still more data,  to the
point where we can run the orbit back to 1977 and see which object
it matches.  (Which is how we were able to identify SOLRAD 11A =
1976-023C last February.)  Keeping fingers crossed...

-- Bill

On 2016-09-07 16:17, Jari wrote:
> Hi Bill,
> Jonathan McDowell has an archive with historical TLEs. Solrad 11b is at
> I _really_ should have remembered this yesterday. In 2007 I matched some photos and
> visual observations of Sputnik 1 booster using the archived TLE.
> Kind regards
> Jari
> -------- Original message --------
> From: Bill Gray <>
> Date: 07/09/2016 20:19 (GMT+02:00)
> To: Jari <>,
> Subject: Re: Your request on Seesat-l
> On 2016-09-06 08:22, Jari wrote:
>> Hi Bill
>> Have you tried your luck at CelesTrak?
>      That looked like an excellent idea.  I gave it a try,  and got back
> a "no TLEs available" message.  TLEs are rather spotty for high-fliers
> in general,  and I wouldn't be surprised if they were still more so back
> in the 1970s.
>      We've gotten a few more observations of the object.  The problem is
> that the mean motion doesn't quite match either SOLRAD 11B or the
> apogee kick motor.  I'll probably see if I can find some of the people
> who worked on this mission forty years ago,  and see if they remember
> anything about what SOLRAD 11B might have been doing near the end of
> its working life in 1979.  A bit of a long shot,  I'm afraid.
> Thanks!            -- Bill
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Received on Thu Sep 08 2016 - 12:57:51 UTC

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