Re: CLIO pre-launch elements

From: Robert Holdsworth via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 17 Sep 2014 10:36:28 +1200
Sorry was updated just as I posted- the latest time advice is in fact
NOT BEFORE 1100.

Robert

On 17 September 2014 10:33, Jon . <jonmikelk_at_gmail.com> wrote:
> now 23:00 UT
>
> 2014-09-17 0:31 GMT+02:00 Robert Holdsworth via Seesat-l
> <seesat-l_at_satobs.org>:
>>
>> 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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>
>
>
>
> --
> Jon Mikel, COSPAR 6242, 42.9453, -2.82839, 623m, Bitoriano, Basque Country.
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Received on Tue Sep 16 2014 - 17:37:09 UTC

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