Author Topic: Gaojing-1&2 (SuperView-1&2) - CZ-2D - TSLC, LC9 - December 28, 2016 (03:23 UTC)  (Read 56168 times)

Offline Phillip Clark

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I seem to remember from descriptions many years ago that the second stage verniers were used for orbit circularisation.
Well, this is not a separate burn, just a continuation of the 2nd stage main engine burn. See this from CZ-2D/JL-1 launch in 2015:

I seemed to remember that was the case but my memory often plays nasty tricks.   So, for today's launch the verniers cut off early, one assumes.
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Offline input~2

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Worth recalling events timeline for CZ-2D launch (Tianhui-1B  in this case):

1st stage engine shutdown / separation: T+156.37 s
Fairing separation: T+186.37 s
2nd stage main engine shutdown: T+334.341 s
2nd stage vernier engines shutdown: T+626.27 s
Spacecraft separation: T+671.27 s

So I tend to agree with Phillip

Offline input~2

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Debris like separation retro-rocket fairing covers have been usually cataloged after the payload...

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CCTV news report screenshots (from https://twitter.com/cnspaceflight/status/814066578094313472) shows that both 1st stage and fairing separated 7 seconds late (off my hazy memory an error within 3-4 seconds is normal, but 7 is a bit off) and 2nd stage MECO was 10 seconds late (the vernier engines would have burned for an additional 7 minutes; dunno if they shut down as planned). While confirmation via tracking of the ham radio satellite would be better, it seems that the orbit is now likely to be off.

Exact liftoff time was 03:23:56.121 UTC.
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A first object has been cataloged by USSTRATCOM:

2016-083A/41907 in 214 x 524 km x 97.58°

Two more objects found in a similar orbit. Hmm......
To be precise:

2016-083B/41908 in 213 x 524 km x 97.59°
2016-083C/41909 in 212 x 524 km x 97.59°
2016-083D/41910 in 216  X  524km  X  97.589°
« Last Edit: 12/28/2016 11:37 am by wsl2005 »

Offline input~2

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In this display, launch mission codename is confirmed as "05-54"
The offsets between planned and actual values of events are also visible:
Stage 1 sep                               planned: T0 + 156.722s   actual: T0 + 163.708s
Fairing sep:                               planned: T0 + 213.722s   actual: T0 + 220.682s
Stage 2 MECO:                          planned: T0 + 322.104s   actual: T0 + 332.533s
Stage 2 Vernier engines cutoff: planned: T0 + 752.013s
S/C sep:                                    planned: T0 + 767.013s
« Last Edit: 12/28/2016 12:26 pm by input~2 »

Offline input~2

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New TLEs for epoch 12:38 UTC bring no significant change for orbits of all 4 objects

Offline Lsquirrel

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launch failed, the satellies will reentry soon

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« Last Edit: 12/28/2016 01:58 pm by Galactic Penguin SST »
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Offline russianhalo117

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The GJ sats have a propulsion system. Is the orbit so off-nominal that using the propellant to raise the GJ sats orbit to its desired orbit is not possible and will significantly shorten its lifespan??
« Last Edit: 12/28/2016 03:07 pm by russianhalo117 »

Offline jcm

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The GJ sats have a propulsion system. Is the orbit so off-nominal that using the propellant to raise the GJ sats orbit to its desired orbit is not possible and will significantly shorten its lifespan??


Good question.  100 m/s is needed. Do we know the mass of the GJ sats? Only about 5 kg of prop per 100 kg
of sat needed.
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Offline input~2

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Here are tentatively the frequencies to try for monitoring BY70-1 before it reenters :(

Offline russianhalo117

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The GJ sats have a propulsion system. Is the orbit so off-nominal that using the propellant to raise the GJ sats orbit to its desired orbit is not possible and will significantly shorten its lifespan??


Good question.  100 m/s is needed. Do we know the mass of the GJ sats? Only about 5 kg of prop per 100 kg
of sat needed.
Well the spacecraft bus is a CAST3000B satellite platform so that plus estimated Kg for the Instrument Module and we will have an approximate answer.

Offline Phillip Clark

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One of the pictures from a brochure previoiusly posted here gives a satellite mass of 560 kg, I believe.
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Offline input~2

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Chinaspaceflight says 570 +/- 20 kg for each

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Offline jcm

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Chinaspaceflight says 570 +/- 20 kg for each

And from a private source I just got info that suggests that yes, they have more than enough dV to get to the right
orbit. Let's watch the TLEs over the coming days.
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Offline KO4MA

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Here are tentatively the frequencies to try for monitoring BY70-1 before it reenters :(

BY70 as been heard and communications made through the repeater by radio amateurs in the US today. 145.920 uplink and 436.200 downlink. Audio at https://soundcloud.com/paul-stoetzer/by70-1-1706z-28-dec-2016

Offline Liss

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BY70-1 - Bayi Kepu Weixing-1
Its full descriptive name is 八一学校科普小卫星 [Bāyī xuéxiào kēpǔ xiǎo wèixīng], that means August 1st School Science Small Satellite.
This message reflects my personal opinion based on open sources of information.

Offline input~2

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BY70-1 - Bayi Kepu Weixing-1
Its full descriptive name is 八一学校科普小卫星 [Bāyī xuéxiào kēpǔ xiǎo wèixīng], that means August 1st School Science Small Satellite.
August 1st is linked to PLA, that explains why the military channel (CCTV 7) had a long report earlier today on this amateur satellite (from which I extracted the picture above of ground test equipment showing  amateur band frequencies)
« Last Edit: 12/28/2016 06:41 pm by input~2 »

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