Author Topic: Tianhe-1 Core Module - CZ-5B - WSLC - April 29, 2021 (03:23 UTC)  (Read 74951 times)

Offline Star One

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Archived launch video:


Offline Atlantis83

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Congratulations to China for this important successful launch. Great to read that all procedures till the deploy of the solar arrays went well. Now we have to wait for the next step - the launch and arrival of the Tianzhou-2 cargo spacecraft with fuel for the station and food and equipment for the first crew.

Renderings: https://www.shymkent.info/space/chinese-spaceflight/chinese-space-station-core-module-tianhe/

« Last Edit: 04/29/2021 12:11 pm by Atlantis83 »

Offline Liss

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48274 and 48275
41.5° 171x382 km
This message reflects my personal opinion based on open sources of information.

Offline Rondaz

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The expert compared the Chinese orbital station with the Mir complex.

12:59 04/29/2021

MOSCOW, April 29 - RIA Novosti. The Chinese orbital manned station "Tiangong", the base module of which was launched on Thursday, is ideologically similar to the Russian "Mir" , and there is nothing wrong with the fact that Russia could technically help China in its creation, said famous astronautics historian Alexander Zheleznyakov .

The Tianhe base module was launched from the Wenchang cosmodrome by the Changzheng 5B launch vehicle.

“We can say, albeit with a stretch, that Russia helped China in creating an orbital station, because the Chinese used our ideology of building orbital stations. vaguely resembles Mir, - Zheleznyakov told RIA Novosti.

At the same time, he found it difficult to answer the question whether Russia could provide the PRC with technical assistance in creating the station.

“I cannot say that we passed on some of our developments to China in this regard. But, on the other hand, even if it was so, there is nothing wrong with it. At one time we helped them with the creation of the Shenzhou manned spacecraft. and space suits for spacewalks, "the expert explained.

The Tianhe module is the base module of the Tiangong orbital station. The Wentian laboratory module and the Mengtian research module are expected to be attached to it in 2022. In addition, in 2025, the Xuntian autonomous astrophysical module is to be launched, which will periodically dock with the station for maintenance.

The Tiangong crew will consist of three people, the duration of the expeditions will be six months. The crews are planned to be delivered to the station by "Shenzhou" ships, and cargo, air and fuel - to "Tianzhou".

In the future, "Tiangong" can be replenished with three more modules.

Tiangong became the 15th manned orbital station launched in the world, and the third multi-module one.

The first station was the Soviet Salyut (civilian long-term orbital station), launched into orbit in 1971 and operated by one crew. Until 2000, seven more such stations were launched. One of them was not launched into orbit due to the accident of the "Proton-K" carrier rocket, the other - "Kosmos-557" - had no crew, as soon after the launch it used up all its fuel. Crews worked at the subsequent stations - "Salyut-4", -6 and -7. The last two stations - the base unit and the Zvezda module - became the basis, respectively, of the Mir multi-module station and the Russian segment of the International Space Station .

In 1973, the first military station Salyut-2, known as Almaz, was launched into orbit, but there were no crews on it due to depressurization shortly after launch. Until 1976, two more such stations were sent into space - "Salyut-3" and -5, on which the crews worked, conducting experiments in the interests of the Soviet military.

The first American station "Skylab" was launched in 1973, and the stations "Tiangong-1" and -2 were delivered to orbit before the multi-module Chinese "Tiangong" in 2011 and 2016. They also carried crews.

https://ria.ru/20210429/kosmos-1730465690.html

Offline Galactic Penguin SST

48274/2021-035A (remember this, you'll need it as much as 25544/1998-067): 171 x 382 km x 41.47 deg.

48275/2021-035B: 169 x 375 km x 41.48 deg.

I'm still trying to confirm if the LM-5B core stage did de-orbit after all...
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery. Current Priority: Chasing the Chinese Spaceflight Wonder Egg & A Certain Chinese Mars Rover

Offline Satori

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Launch code anyone?

Offline Galactic Penguin SST

Launch code anyone?

Seems to be TG/TH (Tiangong/Tianhe?) per the LCC screen and mission logo on the previous page.
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery. Current Priority: Chasing the Chinese Spaceflight Wonder Egg & A Certain Chinese Mars Rover

Offline Galactic Penguin SST

Per 18SPCS tracking data Tianhe has already raised its orbit to 284 x 384 km.
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery. Current Priority: Chasing the Chinese Spaceflight Wonder Egg & A Certain Chinese Mars Rover

Offline Atlantis83

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Per 18SPCS tracking data Tianhe has already raised its orbit to 284 x 384 km.
That Tianhe has to raise its orbit by its own main thrusters to a circular orbit is one of the main reasons that the cargo spacecraft Tianzhou has to visit the station first to provide new fuel for the core module.
« Last Edit: 04/29/2021 02:10 pm by Atlantis83 »

Offline newfrontiers

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Offline newfrontiers

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Offline newfrontiers

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Offline newfrontiers

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Offline newfrontiers

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gif

Offline gemmy0I

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Also note in this occasion the (orbital) CZ-5B core stage is being actively deorbited to avoid the large object's uncontrolled reentry.

https://twitter.com/planet4589/status/1387616907868708864
Wow. Does this mean the YF-77 core stage engines are now restartable?! :o

Or does the core (now?) have some sort of auxiliary thrusters or RCS that it can use for this?

Offline Liss

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Per 18SPCS tracking data Tianhe has already raised its orbit to 284 x 384 km.

cola.exe gives 10:17 UTC as the time of this maneuver, and a second one occurred at 13:48 UTC or so resulting in a 286x392 km  orbit (TBC).
This message reflects my personal opinion based on open sources of information.

Offline eeergo

Also note in this occasion the (orbital) CZ-5B core stage is being actively deorbited to avoid the large object's uncontrolled reentry.

https://twitter.com/planet4589/status/1387616907868708864
Wow. Does this mean the YF-77 core stage engines are now restartable?! :o

Or does the core (now?) have some sort of auxiliary thrusters or RCS that it can use for this?

Either the deorbit burn failed (I'd guess they'd use RCS of some sort, maybe just propulsive venting of the residual propellants), or the remark during the webcast was in error, but the CZ-5B core is still in orbit (~170x375 km at 41.5º) and tumbling as expected for such a spent stage:

https://twitter.com/Cosmic_Penguin/status/1388031410204598276

https://twitter.com/planet4589/status/1388012618984697856
-DaviD-

Offline soyuzu

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Tianhe-1 Core Module - CZ-5B - WSLC - April 29, 2021 (03:23 UTC)
« Reply #137 on: 04/30/2021 08:41 am »
Also note in this occasion the (orbital) CZ-5B core stage is being actively deorbited to avoid the large object's uncontrolled reentry.

https://twitter.com/planet4589/status/1387616907868708864
Wow. Does this mean the YF-77 core stage engines are now restartable?! :o

Or does the core (now?) have some sort of auxiliary thrusters or RCS that it can use for this?
The diagram in the Twitter reply shows they added two “deorbit rocket” to the core stage, I would guess it is solid separation motor like those used on S-II for Skylab mission.
« Last Edit: 04/30/2021 08:50 am by soyuzu »

Offline fruitshop

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Tianhe-1 Space Station will have ion thrusters and +30% solar cell efficiency

« Last Edit: 04/30/2021 09:04 am by fruitshop »

Offline gdelottle

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In the picture below the thrusters on the bottom are tilted. Do you know if they can be gimballed in orbit?

I ask because I read somewhere that actually they are tilted only during launch but they will stay orthogonal to the axis of the module once on orbit.

If this is true, why is that? To fit into the fairing? I'm surprised it is worth adding the complicacy of a gimbal to save a few inches.

https://forum.nasaspaceflight.com/assets/40613.0/2030397.jpg

« Last Edit: 04/30/2021 09:09 am by gdelottle »

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