Author Topic: LIVE: TG-2 Tiangong-2 - CZ-2F/T2 - JSLC - September 15, 2016 (14:04 UTC)  (Read 95038 times)

Online Phillip Clark

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The Banxing 2 subsatellite, launched with Tiangong 2, is supposed to be providing images of the Shenzhou 11 docking and undocking operations - in which case it needs to separate in the next couple of days and start operating.

Offline Thomas Dorman

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Has any one heard if the crew has dock with Tiangong 2 or if not does any one know when the docking  will take place?

Regards
Thomas

Offline fthomassy

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Has any one heard if the crew has dock with Tiangong 2 or if not does any one know when the docking  will take place?

Regards
Thomas
http://forum.nasaspaceflight.com/index.php?topic=32123.540
gyatm . . . Fern

Online Phillip Clark

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I have never been known to speculate excessively (please stop laughing everyone) but ...........

The Chinese have been talking about the Tiangong Complex as operating in a 400 km orbit.   Having a play with some numbers suggests a 41.78 deg, 92.548 minutes orbital period with a mean altitude of 399 km gives a 107 circuits repeating orbit, that is every seven days less 177.4 minutes.   This is a longer repeating pattern than we normally see with piloted missions.

Of course, I could be taking the 400 km altitude too literally.

Offline Steven Pietrobon

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It was mentioned in the launch broadcast that the orbit is 393 km, the same as the future modular space station. N2YO gives an orbit of 381.1 x 392.8 km, but that is using the mean Earth Radius of 6371.009 km. Using the equatorial radius of 6378.137 km (like everyone else does I believe) gives an orbit of 374.0 x 385.7 km, which is a bit lower then 393 km.

http://www.n2yo.com/satellite/?s=41765
« Last Edit: 10/21/2016 05:00 AM by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline MATTBLAK

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I have never been known to speculate excessively (please stop laughing everyone) but ...........

The Chinese have been talking about the Tiangong Complex as operating in a 400 km orbit.   Having a play with some numbers suggests a 41.78 deg, 92.548 minutes orbital period with a mean altitude of 399 km gives a 107 circuits repeating orbit, that is every seven days less 177.4 minutes.   This is a longer repeating pattern than we normally see with piloted missions.

Of course, I could be taking the 400 km altitude too literally.

But... But; if they go to that inclination, how will Sandra Bullock reach them in the Soyuz?! ;)
"Those who can't, Blog".   'Space Cadets' of the World - Let us UNITE!! (crickets chirping)

Online Phillip Clark

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It was mentioned in the launch broadcast that the orbit is 393 km, the same as the future modular space station. N2YO gives an orbit of 381.1 x 392.8 km, but that is using the mean Earth Radius of 6371.009 km. Using the equatorial radius of 6378.137 km (like everyone else does I believe) gives an orbit of 374.0 x 385.7 km, which is a bit lower then 393 km.
http://www.n2yo.com/satellite/?s=41765

All of my orbital altitude calculations are based upon a spherical Earth with a radius of 6,378 km.   I have noted that the Chinese altitudes are always about 10 km higher than mine which I put down to them using a different Earth model.

Offline ethan829

https://twitter.com/planet4589/status/790137233688977412
Quote
The "Tiangong 2 subsatellite"  (Tiangong er hao bansui weixing,天宫二号伴随卫星)
was ejected from the TG-2/SZ-11 complex at 2331 UTC Oct 22

Offline GELORD

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Today, 23 October, at 07:31 Beijing time from the orbital complex "Tiangong-2" - "Shenzhou-11" satellite successfully inspector "BanXing2" has been separated (the BX-2), 伴星 二 号
与战士站岗、炊事员做饭一样,航天员是一种职业,工作就是飞行。

Offline GELORD

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"BanXing2" (BX-2), 伴星 二号 - small spacecraft (SC), which will be launched to the orbital complex "Tiangong-2" - "Shenzhou-11". The objective of the spacecraft will be inspecting and photographing space laboratory "Tiangong-2."

The satellite inspector feature high resolution camera with a resolution of over 25 megapixels. It is a cube of about 40 cm (16 inches), with a weight of 40 kg (88 pounds) of a stereo camera having two megapixels.

The propulsion system of the spacecraft "BanXing2" (BX2), maneuvering around the orbital complex "Tiangong-2" - "Shenzhou-11", will use fuel-based liquid ammonia. Mini-moon will run for three months.

CA Tasks "BanXing2" (BX2) - Testing of mini-satellite technology, monitoring and control of space systems, as well as technology testing, used to maneuver the spacecraft from 100 to 200 kilometers from the orbital complex "Tiangong-2" - "Shenzhou-11" .

The first spacecraft "BanHing" series (BX-1) was used in free flight for transfer spacecraft image "Shenzhou-7". It was separated 27 September 2008 from the manned spacecraft "Shenzhou-7". SC "BanXing2" (BX2) was designed and built in the Shanghai Academy of Spaceflight Technology (SAST).
与战士站岗、炊事员做饭一样,航天员是一种职业,工作就是飞行。

Online Liss

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Strange enough nobody mentioned an orbit trim on October 20 -- 4.3 km downwards.
« Last Edit: 10/23/2016 03:06 PM by Liss »

Online Phillip Clark

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Do we know if the propulsion system of Tiangong of Shenzhou was used?

Online Galactic Penguin SST

So far this is the best photo released of TG-2 from BX-2:

(image via CCTV)

The second photo is of BX-2 as seen in a video captured by the astronauts.

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

Online Galactic Penguin SST

(copying from the SZ-11 thread)
Here are the visible light photos of TG-2 and SZ-11 as taken by BX-2:
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline Star One

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Offline starbase

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Landing of Shenzhou 11 is reported for Friday Nov. 18th between 05:33 - 06:13 UTC (00:33 - 01:13 EST / 13:33 - 14:13 Beijing time)

https://twitter.com/AJ_FI/status/798807009063636992

Offline ืnewsman

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Live: China's Shenzhou-11 Spacecraft Returns to Earth

Offline ืnewsman

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Online Phillip Clark

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It looks as if the Tiangong 2 operations with Banxing 2 have ended.   During March 4-5 the orbit of Tiangong 2 was raised from 367-378 km to 374-386 km, while the orbit of Banxing continues to decay (365-377 km as of today).

I expect that there will be further upward manoeuvres, returning to the 46-circuits repeating orbit in time for the Tianzhou 1 launch in April.
« Last Edit: 03/13/2017 09:10 AM by Phillip Clark »

Online Phillip Clark

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During April 4-6 the orbit of Tiangong 2 was raised from 92.12 min, 374-382 km to 92.26 minutes, 379-391 km which is slightly above the 46-circuits repeating orbit period.

Presumably this is in preparation for the Tianzhou 1 launch - still scheduled for April 23?

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