Re: Has Tiangong 1 gone rogue

From: Scott Tilley via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 31 Mar 2016 19:54:23 -0700
Hi All

On March 31st, I monitored most of my evening passes of Tiangong 1 and 
noted no radio activity on the two s-band frequencies the mission used.  
Before this every time I checked or happened by these they were active 
in the past passes.

Regards,
Scott

On 3/31/2016 2:33 AM, Marco Langbroek via Seesat-l wrote:
> Op 31-3-2016 om 0:49 schreef Kevin Fetter via Seesat-l:
>> http://www.spacedaily.com/reports/Has_Tiangong_1_gone_rogue_999.html
>
> Xinhua says the following 
> (http://news.xinhuanet.com/english/2016-03/21/c_135209671.htm):
>
> "The functions of the space laboratory and target orbiter have been 
> disabled after an extended service period of about two and a half 
> years, although it remains in designed orbit, according to the office"
>
> That is ambiguous wording: it might be read as meaning that the 
> station was intentionally put in dormant state ("have been disabled"), 
> which is something different than a loss of contact.
>
> In that case, it could be that they intend to have it come down for a 
> while by natural decay, and then revive it for a deorbit burn when it 
> is at a lower orbital altitude than it is now. One reason to do so is 
> when the amount of fuel left after its extended mission is not enough 
> to deorbit it from its current orbital altitude.
>
> But then again, maybe they do mean an actual loss of contact with it. 
> Well, we'll see what happens.
>
> If it ends with a fully natural decay and re-entry, then based on a 
> fixed F10.7 flux of 100 and the element sets of last month, current 
> SatEvo estimates for re-entry vary between April 2017 and January 
> 2018, i.e. mid 2017 to early 2018.
>
> - Marco
>
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Received on Thu Mar 31 2016 - 21:55:30 UTC

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