Author Topic: Shijian-16 #02 (SJ-16-02) - CZ-4B - JSLC, June 29, 2016 (03:21 UTC)  (Read 4917 times)

Offline beidou

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Launch of the second satellite on the Shijian-16 series.
« Last Edit: 06/29/2016 07:36 PM by beidou »

Offline beidou

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Re: Yaogan 31 (YG-31) - 2016
« Reply #1 on: 06/27/2016 12:33 PM »
NoTAMs:

A1507/16 (Issued for ZLHW ZPKM) - A TEMPORARY RESTRICTED AREA ESTABLISHED WI THE
AREA:N325700E1031731-N324930E1024016-N334200E1022450-N334944E103023
5
BACK TO START.VERTICAL LIMITS:GND-UNL. GND - UNL, 29 JUN 03:10 2016 UNTIL 29
JUN 03:45 2016. CREATED: 27 JUN 06:06 2016

Offline Galactic Penguin SST

Re: Yaogan 31 (YG-31) ?-JSLC, June 29, 2016
« Reply #2 on: 06/27/2016 12:53 PM »
You sure that it will follow the YG series?  ;) The trajectory seems weird (too much SSE to be for a 63 degree orbit), except that there's one similar launch - SJ-16 back in 2013 flew to a 75 degree orbit and the path more or less agrees with that.

So a CZ-4B then eh?

Also the original post was from here:

Could that be a sign of a launch from Jiuquan on June 29 from 0310 UTC?

A1507/16 -  A TEMPORARY RESTRICTED AREA ESTABLISHED WI THE AREA:N325700E1031731-N324930E1024016-N334200E1022450-N334944E103023 5 BACK TO START.VERTICAL LIMITS:GND-UNL. GND - UNL, 29 JUN 03:10 2016 UNTIL 29 JUN 03:45 2016. CREATED: 27 JUN 06:06 2016
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline input~2

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So could it be an SJ-16#2 launched by CZ-4B in a circular ~600 km orbit inclined 75°?

Offline Galactic Penguin SST

So could it be an SJ-16#2 launched by CZ-4B in a circular ~600 km orbit inclined 75°?

Seems like this is exactly what it is and it has been placed in orbit! I'm waiting for the official news to come out...
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline Galactic Penguin SST

So could it be an SJ-16#2 launched by CZ-4B in a circular ~600 km orbit inclined 75°?

Seems like this is exactly what it is and it has been placed in orbit! I'm waiting for the official news to come out...

...and finally the official news is out. It's indeed SJ-16 #02 and liftoff occurred at 03:21 UTC.

http://news.xinhuanet.com/tech/2016-06/29/c_1119133736.htm
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline fringe_dweller

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2016-043A  SCN 41634: 616 x 595 x 75.01°
2016-043B  SCN 41635: 594 x 338 x 74.98°

Offline input~2

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2 objects have already been cataloged by USSTRATCOM

2016-043A/41634 in 595 x 616 km x 75.0° (presumably SJ-16#2)
2016-043B/41635 in 338 x 594 km x 74.98°

Offline input~2

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Offline input~2

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Launch mission codename should be "01-75"

Offline input~2

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Offline Galactic Penguin SST

Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline Satori

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Offline Satori

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Launcher serial number is Y35.

Offline input~2

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Offline jcm

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So, what is our current thinking about what makes them call something Yaogan and something else Shi Jian?
Shi Jian includes technology development but also includes military series like SJ-16 and SJ-11... is it an issue
of parent organization/management and if so what are the details?
-----------------------------

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Online Phillip Clark

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So, what is our current thinking about what makes them call something Yaogan and something else Shi Jian?
Shi Jian includes technology development but also includes military series like SJ-16 and SJ-11... is it an issue
of parent organization/management and if so what are the details?

The Chinese are trying to confuse us to death - like the Russians have tried in the past! ;)

I am trying to sort out the interplay - if there is one - between the Shijian, Shiyan Weixing and Yaogan Weixing programmes at present.

Online Steven Pietrobon

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Some screen captures. Couldn't make out the launch code.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online Phillip Clark

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Just been playing with some numbers for this launch.

SJ-16-1 was launched into a 601-616 km orbit while SJ-16-2 was initially 596-616 km.

On December 16, 2016 the orbit of SJ-16-2 was raised to 606-617 km and again on December 18 to 608-617 km.  SJ-16-1 atthat time was in a 598-627 km orbit with essentially the same orbital period.  The orbital planes are about 90 degrees apart and the satellites are crossing the equator at pretty-much the same time.

Offline Liss

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To put a picture for Phillip's data:

« Last Edit: 03/14/2017 05:49 PM by Liss »

Online Phillip Clark

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Thank you Igor.   It was not until after the posting that I noticed that the first Shijian-16 had also been manoeuvring.   Still doing the analysis.

Online Phillip Clark

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These are three graphs, showing the evolution of the orbital periods and orbital altitudes of the two Shijian-16 satellites, plus a graph showing the phasing between the satellites around their orbits.   My versions of Igor's graph!
« Last Edit: 03/18/2017 08:38 AM by Phillip Clark »

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