Re: NROL-55 search elements

From: Steven Rappolee via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 8 Oct 2015 18:28:56 -0400
yesterday someone at #asknasa and on NASA TV asked if the cubsats shared a
orbit with the NRO payload a question that could not be answered  do to
secrecy so a better question would be do the cubesats share an orbit with
the Centaur?


[image: photo]
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On Thu, Oct 8, 2015 at 9:22 AM, Ted Molczan via Seesat-l <
seesat-l_at_satobs.org> wrote:

> Lift-off was at 12:49:30 UTC - 30 s later than the basis for my estimated
> TLEs. Since the difference is likely to be
> within the margin of uncertainty for observers tonight, it is not
> necessary to revise them.
>
> NOSS 3-7                                               1013 X 1200 km
> 1 79701U          15281.61469908  .00000000  00000-0  00000-0 0    07
> 2 79701  63.4283 292.5778 0124892 180.5274 352.9095 13.40429195    06
>
> Centaur final orbit                                      459 X 775 km
> 1 79702U          15281.65902778  .00000000  00000-0  00000-0 0    09
> 2 79702  64.6863 291.3514 0225821 294.8437 113.6381 14.83391172    04
>
> The above are derived from the NOSS 3-6 launch. Twenty-four hours after
> launch, allow for at least several minutes time
> error, and several degrees of track error on high elevation passes.
>
> In the northern hemisphere, the NOSS orbit will be well-placed for all
> night observation. Southern hemisphere observers
> will have evening visibility, but near twilight.
>
> Based on the current forecast, I expect to be clouded out tonight.
>
> I expect to be unavailable for orbit analysis from roughly 20:00 UTC to
> 00:00 UTC.
>
> Ted Molczan
>
>
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Received on Thu Oct 08 2015 - 17:29:41 UTC

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