Re: De-orbit burn Zuma Falcon 9 upper stage seen

From: ronlee--- via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 9 Jan 2018 08:21:38 -0700 (MST)
Look at Marco's posting.

https://sattrackcam.blogspot.nl/2018/01/fuel-dump-of-zumas-falcon-9-upper-stage.html

Deorbit burn would have occurred prior to the venting of excess fuel.

Ron


> Reddit has posts of images of an apparent upper stage event.
>
> https://www.reddit.com/r/whatisthisthing/comments/7oy9yi/a_weird_looking_star_showed_up_in_sudans_sky/
>
> One image was posted on Facebook seeming to show a discharge or burn
while
> spinning. I thought SpaceX upper stage just deorbits, not bent fuel.
>
> If the speculation of a Zuma failure is true, Iā€™m wondering if this
was
> the deorbit burn with the payload attached causing it to spin in which
case it seems that it might still be in orbit.
>
> Bill
>
>> On Jan 8, 2018, at 3:35 PM, Marco Langbroek via Seesat-l
>> <seesat-l_at_satobs.org> wrote:
>> Verstuurd vanaf mijn iPad
>>> Op 8 jan. 2018 om 19:24 heeft Marco Langbroek via Seesat-l
>>> <seesat-l_at_satobs.org> het volgende geschreven:
>>> Op 8-1-2018 om 19:10 schreef Marco Langbroek via Seesat-l:
>>>> The images definitely show something rocket-related. Time reportedly
was near
>>>> 2:18 UT (January 8), location flying above Khartoum in Sudan.
>>> The time quoted bothers me a bit, as it is too early. 3:18 UT rather
than 2:18
>>> UT would match my approximate Zuma trajectory reconstruction better,
as
>>> 3:18 UT
>>> would place the Zuma rb around East Africa.
>>> I have put out some questions to the eyewitness, so maybe mor eon this
later.
>> I have had contact with the pilot now, and the initially quoted time
was
>> in error by one hour and should be ~3:18 UT. The flight log shows the
aircraft passed Khartoum around 3:25 UT. On the images, Khartoum can be
seen in front of the (southbound) aircraft.
>> This also confirms that my orbital estimate for Zuma appears to be
correct. In my orbit estimate for the upper stage, it would pass over
east Africa ~3:15 UT, i.e. the times match to within minutes.
>> I will post the images on my blog later this week.
>> - Marco
>>> - Marco
>>> -----
>>> Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
>>> e-mail: sattrackcam_at_langbroek.org
>>> Cospar 4353 (Leiden):     52.15412 N, 4.49081 E (WGS84), +0 m ASL
Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
Station (b)log: http://sattrackcam.blogspot.com
>>> Twitter: _at_Marco_Langbroek
>>> -----
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Received on Tue Jan 09 2018 - 09:22:16 UTC

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