Re: CLIO pre-launch elements

From: Robert Holdsworth via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 17 Sep 2014 10:31:51 +1200
Delayed owing to weather.  Next attempt at  1044 UTC.

Robert



On 16 September 2014 05:11, Ted Molczan via Seesat-l
<seesat-l_at_satobs.org> wrote:
> CLIO is a Lockheed Martin-built communications satellite (A-2100 bus), belonging to the U.S. Government. It is scheduled
> for launch between 2014 Sep 16 21:44 UTC and Sep 17 00:10 UTC, from Cape Canaveral, aboard an Atlas V-401.
>
> http://www.spaceflightnow.com/atlas/av049/status.html
>
> The official pre-launch information bears a strong superficial resemblance to that of PAN (09047A / 35815), which
> operates in a GSO (geostationary orbit). I suspect that CLIO will do likewise.
>
> Judging by the information in the press-kit, the launch trajectory appears to be some variant of the Extended Coast
> type, which typically results in a highly elliptical parking orbit, in which the vehicle coasts for a period of up to
> two hours, before manoeuvring to GTO (geosynchronous transfer orbit). The resulting orbit is lower in eccentricity and
> inclination than that of the more common GTO, in which the manoeuvre to GTO occurs at the first descending node. This
> reduces the delta-V required of the payload to enter GEO, which saves fuel, and extends its maximum useful life. The
> spacecraft uses its own propulsion system to perform a series manoeuvres to reach GSO, typically within a few weeks
> after launch. PAN reached GSO within about 10 days of launch.
>
> Assuming launch on Sep 16 at 21:44 UTC, and a parking orbit similar to the one we determined for PAN, the following TLE
> would be valid from about 22:02 UTC until the manoeuvre to the transfer orbit:
>
> Parking orbit                                          176 X 21623 km
> 1 78401U          14259.98653000  .00000000  00000-0  00000-0 0    05
> 2 78401  25.3510 143.5430 6206470 145.1850  95.2000  3.82400000    00
>
> According to the press-kit, the manoeuvre to the transfer orbit will occur at 00:31:53 UTC (T+ 02h47m52.9s). I may
> produce an estimated TLE later.
>
> Ted Molczan
>
>
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Received on Tue Sep 16 2014 - 17:32:52 UTC

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