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Gaojing-1&2 (SuperView-1&2) - CZ-2D - TSLC, LC9 - December 28, 2016 (03:23 UTC)
by
beidou
on 31 Oct, 2015 08:49
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#1
by
beidou
on 04 Nov, 2015 18:17
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#2
by
beidou
on 11 Aug, 2016 15:30
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The Gaojing remote sensing satellite constellation has been translated as "
SuperView" in English.
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#3
by
Satori
on 15 Nov, 2016 08:08
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GJ-1 GaoJing-1 (1) and GJ-1 Gaojing-1 (2) to be launched from Taiyuan Satellite Launch Center on December 26.
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#4
by
Skyrocket
on 15 Nov, 2016 08:49
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GJ-1 GaoJing-1 (1) and GJ-1 Gaojing-1 (2) to be launched from Taiyuan Satellite Launch Center on December 26.
Really from Taiyuan? CZ-2D has never been launched from there. Or does that possibly hint to a CZ-4 version as launch vehicle?
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#5
by
Galactic Penguin SST
on 15 Nov, 2016 08:53
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GJ-1 GaoJing-1 (1) and GJ-1 Gaojing-1 (2) to be launched from Taiyuan Satellite Launch Center on December 26.
Really from Taiyuan? CZ-2D has never been launched from there. Or does that possibly hint to a CZ-4 version as launch vehicle?
Probably CZ-2C.
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#6
by
SmallKing
on 15 Nov, 2016 09:37
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#7
by
Satori
on 15 Nov, 2016 10:43
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GJ-1 GaoJing-1 (1) and GJ-1 Gaojing-1 (2) to be launched from Taiyuan Satellite Launch Center on December 26.
Really from Taiyuan? CZ-2D has never been launched from there. Or does that possibly hint to a CZ-4 version as launch vehicle?
Probably CZ-2C.
I assume is a CZ-2C, but Chinaspaceflifht.com is saying is a CZ-2D.
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#8
by
Skyrocket
on 15 Nov, 2016 11:32
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GJ-1 GaoJing-1 (1) and GJ-1 Gaojing-1 (2) to be launched from Taiyuan Satellite Launch Center on December 26.
Really from Taiyuan? CZ-2D has never been launched from there. Or does that possibly hint to a CZ-4 version as launch vehicle?
Probably CZ-2C.
I assume is a CZ-2C, but Chinaspaceflifht.com is saying is a CZ-2D.
Yes, based on launch site and the nature of the payload, a CZ-2C seems to be most likely.
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#9
by
Skyrocket
on 20 Nov, 2016 11:23
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I have reverted my list back to CZ-2D and Jiuquan as a launch site.
The IARU site shows the BY70-1 cubesat to be launched on 26 December 2016 from Jiuquan - with the date indicating a launch with GaoJing 1. With Jiuquan as a launch site, there is no more reason to assume a CZ-2C instead to the earlier announced CZ-2D.
http://www.amsatuk.me.uk/iaru/formal_detail.php?serialnum=531
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#10
by
Satori
on 20 Nov, 2016 11:43
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I have reverted my list back to CZ-2D and Jiuquan as a launch site.
The IARU site shows the BY70-1 cubesat to be launched on 26 December 2016 from Jiuquan - with the date indicating a launch with GaoJing 1. With Jiuquan as a launch site, there is no more reason to assume a CZ-2C instead to the earlier announced CZ-2D.
http://www.amsatuk.me.uk/iaru/formal_detail.php?serialnum=531
Interesting information and I agree with you! The original announcement for the GJ satellites was a CZ-2D from Jiuquan. I'll also change that on the thread title and on the Chinese Launch Schedule.
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#11
by
SmallKing
on 23 Nov, 2016 03:53
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Looks like it will happen in TaiYuan, Shanxi Province
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#12
by
Satori
on 25 Nov, 2016 17:25
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Well, it looks it now obvious that in fact this launch will be from Taiyuan as the two satellites were today delivered there.
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#13
by
Galactic Penguin SST
on 25 Nov, 2016 23:04
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Well, it looks it now obvious that in fact this launch will be from Taiyuan as the two satellites were today delivered there.
I doubt it's CZ-2D though - there's no orbit that can fly from Taiyuan that can't be flown from Jiuquan, while the opposite is not true.
If it really is (no obvious hints from SAST that they are bringing the 2D to Taiyuan), there must be some compelling reason that we don't know to do so.
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#14
by
Skyrocket
on 25 Nov, 2016 23:24
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Okay, back to Taiyuan and (likely) CZ-2C...
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#15
by
Phillip Clark
on 26 Nov, 2016 07:26
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It's a Chinese conspiracy to confuse us all to death.
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#16
by
Satori
on 28 Nov, 2016 17:16
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If there was any doubt about the launcher to be used.
Image from Chinaspaceflight.com.
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#17
by
Satori
on 29 Nov, 2016 19:17
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BY70-1 was sent to Taiyuan on November 29.
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#18
by
jcm
on 02 Dec, 2016 03:13
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#19
by
Stan Black
on 02 Dec, 2016 12:50
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If there was any doubt about the launcher to be used.
Image from Chinaspaceflight.com.
The image has details obscured with pixelation; what details need be hidden?
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#20
by
GELORD
on 19 Dec, 2016 20:43
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Gaojing-1&2 (SuperView-1&2) - CZ-2D - TSLC, LC9 - December 26, 2016
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#21
by
Galactic Penguin SST
on 23 Dec, 2016 13:32
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#22
by
Satori
on 23 Dec, 2016 13:59
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BY70-1 - Bayi Kepu Weixing-1
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#23
by
wsl2005
on 24 Dec, 2016 04:38
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BY70-1 - Bayi Kepu Weixing-1
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#24
by
wsl2005
on 24 Dec, 2016 07:25
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#25
by
GELORD
on 24 Dec, 2016 11:42
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Gaojing-1&2 (SuperView-1&2)
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#26
by
Galactic Penguin SST
on 24 Dec, 2016 16:18
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#27
by
Satori
on 25 Dec, 2016 04:13
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#28
by
spacevogel
on 25 Dec, 2016 14:28
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#29
by
GELORD
on 25 Dec, 2016 22:31
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Gaojing-1&2 (SuperView-1&2)
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#30
by
Chris Bergin
on 26 Dec, 2016 10:41
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Do we have a rough time of day for the launch on the 28th?
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#31
by
Satori
on 26 Dec, 2016 10:55
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Do we have a rough time of day for the launch on the 28th?
Same launch time, 03:30UTC.
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#32
by
Galactic Penguin SST
on 26 Dec, 2016 14:37
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Well, it looks it now obvious that in fact this launch will be from Taiyuan as the two satellites were today delivered there.
I doubt it's CZ-2D though - there's no orbit that can fly from Taiyuan that can't be flown from Jiuquan, while the opposite is not true.
If it really is (no obvious hints from SAST that they are bringing the 2D to Taiyuan), there must be some compelling reason that we don't know to do so.
It seems that the best explanation is simply that the CZ-2D launch frequency is growing beyond the capability of using a single pad - it will log 6 launches this year and SAST claims up to 8~10 launches next year (taking away most of those used to fly with CZ-2C?). With other rockets sharing the Jiuquan pad as well it would make sense to use Taiyuan as an alternative launch site.
This article written 3 days ago explicitly wrote that the CZ-2D now shares a completely same 1st stage with that of the CZ-4 series (in terms of structure, engine and propellant volume), which means that CZ-2D launches from Taiyuan can share the existing CZ-4 1st stage drop zone too.
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#33
by
russianhalo117
on 26 Dec, 2016 16:40
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Well, it looks it now obvious that in fact this launch will be from Taiyuan as the two satellites were today delivered there.
I doubt it's CZ-2D though - there's no orbit that can fly from Taiyuan that can't be flown from Jiuquan, while the opposite is not true.
If it really is (no obvious hints from SAST that they are bringing the 2D to Taiyuan), there must be some compelling reason that we don't know to do so.
It seems that the best explanation is simply that the CZ-2D launch frequency is growing beyond the capability of using a single pad - it will log 6 launches this year and SAST claims up to 8~10 launches next year (taking away most of those used to fly with CZ-2C?). With other rockets sharing the Jiuquan pad as well it would make sense to use Taiyuan as an alternative launch site.
This article written 3 days ago explicitly wrote that the CZ-2D now shares a completely same 1st stage with that of the CZ-4 series (in terms of structure, engine and propellant volume), which means that CZ-2D launches from Taiyuan can share the existing CZ-4 1st stage drop zone too.
I would't be surprised if more standardization and consolidation of versions in the CZ-2 and CZ-4 series occurs resulting a single standardized series like what has been done with CZ-3 series.
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#34
by
ZachS09
on 26 Dec, 2016 18:00
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Why not make a Long March 4D rocket and retire the Long March 2D altogether?
The Long March 4D would be a combination of the Long March 2D and the Long March 4 family since both have some sort of commonality. It's more of a fanmade idea rather than official.
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#35
by
russianhalo117
on 26 Dec, 2016 18:22
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Why not make a Long March 4D rocket and retire the Long March 2D altogether?
The Long March 4D, would be a combination of the Long March 2D and the Long March 4 family since both have some sort of commonality. It's more of a fanmade idea rather than official.
Might as well retire CZ-2C with CZ-2D and fully standardize all versions in the CZ-4 series as that would give greater capability and launch rate thus reducing cost and increasing competitiveness.
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#36
by
Galactic Penguin SST
on 27 Dec, 2016 13:25
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The Chinese company Space View, which will operate the SuperView satellites, has confirmed that the launch is on schedule for tomorrow:
Space View @bjspaceview
To be launched tommorrow!
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#37
by
zubenelgenubi
on 27 Dec, 2016 22:13
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#38
by
Chris Bergin
on 28 Dec, 2016 02:51
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No locals complaining about rattling windows yet?
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#39
by
Galactic Penguin SST
on 28 Dec, 2016 03:00
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No locals complaining about rattling windows yet?
There are only mountains to rattle next to TSLC.
Can't find anything yet - I suspect the original conjectured launch time might be wrong so....
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#40
by
Steven Pietrobon
on 28 Dec, 2016 03:00
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#41
by
Galactic Penguin SST
on 28 Dec, 2016 03:11
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Checking the usual rumor sources shows that this should happen around noon local time, which has just passed. Expect some news within the next hour or two.
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#42
by
SmallKing
on 28 Dec, 2016 03:15
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Reports about rattling windows only occur in Xichang
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#43
by
Galactic Penguin SST
on 28 Dec, 2016 03:16
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Launch success reports has just came in with T-0 at 03:23 UTC.
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#44
by
Chris Bergin
on 28 Dec, 2016 03:17
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#45
by
fs10inator
on 28 Dec, 2016 04:12
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Now even the CZ-4's two-stage cousin gets a fairing size boost!
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#46
by
chewi
on 28 Dec, 2016 05:05
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China launches high-resolution remote sensing satellitesTAIYUAN, Dec. 28 (Xinhua) -- China launched a pair of 0.5-meter high-resolution remote sensing satellites from the Taiyuan Satellite Launch Center in Shanxi Province on Wednesday.
The satellites, SuperView-1 01/02, blasted off at 11:23 a.m. Beijing time on the back of a Long March 2D rocket, according to the center.
They are able to provide commercial images at 0.5-meter resolution.
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#47
by
jcm
on 28 Dec, 2016 05:27
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#48
by
Galactic Penguin SST
on 28 Dec, 2016 05:28
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There are some rumors out there (starting with a tweet from a CCTV correspondent) that something went wrong after going into orbit - either the orbit is off or the main sats might be experiencing problems maybe?
BY70 did contact with Earth as planned.
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#49
by
input~2
on 28 Dec, 2016 05:47
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#50
by
input~2
on 28 Dec, 2016 06:44
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A first object has been cataloged by USSTRATCOM:
2016-083A/41907 in 214 x 524 km x 97.58°
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#51
by
input~2
on 28 Dec, 2016 07:11
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#52
by
Galactic Penguin SST
on 28 Dec, 2016 08:03
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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......
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#53
by
Phillip Clark
on 28 Dec, 2016 08:20
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An obvious deduction is that the orbit circularisation manoeuvre failed to take place.
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#54
by
Liss
on 28 Dec, 2016 08:32
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Let's see if the second TLE set confirms this.
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#55
by
Liss
on 28 Dec, 2016 08:44
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An obvious deduction is that the orbit circularisation manoeuvre failed to take place.
I wonder if CZ-2D second stage makes two burns. I'd think of insufficient velocity at insertion.
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#56
by
Phillip Clark
on 28 Dec, 2016 08:48
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An obvious deduction is that the orbit circularisation manoeuvre failed to take place.
I wonder if CZ-2D second stage makes two burns. I'd think of insufficient velocity at insertion.
I seem to remember from descriptions many years ago that the second stage verniers were used for orbit circularisation.
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#57
by
input~2
on 28 Dec, 2016 08:52
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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°
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#58
by
Liss
on 28 Dec, 2016 08:52
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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:
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#59
by
ืnewsman
on 28 Dec, 2016 09:02
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China Launches High-resolution Remote Sensing Satellites
CCTV+
Published on Dec 27, 2016
China launched a pair of 0.5-meter high-resolution remote sensing satellites from the Taiyuan Satellite Launch Center in Shanxi Province on Wednesday.
The satellites, SuperView-1 01/02, blasted off at 11:23 on Wednesday. Beijing time on the back of a Long March 2D rocket, according to the center.
They are able to provide commercial images at 0.5-meter resolution.
A small satellite built by high school students in Beijing was also launched into space in Wednesday's mission.
More than 40 students from the Beijing Bayi High School built the satellite under the instructions from experts. The satellite will stay in space for more than 180 days.
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#60
by
Phillip Clark
on 28 Dec, 2016 09:04
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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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#61
by
input~2
on 28 Dec, 2016 09:07
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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
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#62
by
input~2
on 28 Dec, 2016 09:34
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Debris like separation retro-rocket fairing covers have been usually cataloged after the payload...
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#63
by
Galactic Penguin SST
on 28 Dec, 2016 10:46
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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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#64
by
wsl2005
on 28 Dec, 2016 11:36
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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°
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#65
by
input~2
on 28 Dec, 2016 12:20
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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
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#66
by
input~2
on 28 Dec, 2016 12:34
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New TLEs for epoch 12:38 UTC bring no significant change for orbits of all 4 objects
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#67
by
Lsquirrel
on 28 Dec, 2016 12:59
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launch failed, the satellies will reentry soon
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#68
by
Galactic Penguin SST
on 28 Dec, 2016 13:00
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#69
by
russianhalo117
on 28 Dec, 2016 14:56
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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??
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#70
by
jcm
on 28 Dec, 2016 15:20
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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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#71
by
input~2
on 28 Dec, 2016 15:23
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Here are tentatively the frequencies to try for monitoring BY70-1 before it reenters
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#72
by
russianhalo117
on 28 Dec, 2016 15:31
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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.
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#73
by
Phillip Clark
on 28 Dec, 2016 15:33
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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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#74
by
input~2
on 28 Dec, 2016 15:42
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Chinaspaceflight says 570 +/- 20 kg for each
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#75
by
Galactic Penguin SST
on 28 Dec, 2016 15:42
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#76
by
jcm
on 28 Dec, 2016 16:44
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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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#77
by
KO4MA
on 28 Dec, 2016 17:48
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#78
by
Liss
on 28 Dec, 2016 18:28
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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.
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#79
by
input~2
on 28 Dec, 2016 18:37
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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)
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#80
by
Liss
on 28 Dec, 2016 18:41
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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 usually linked to PLA
Naturally, because it's PLA birthday. In Russia, it would be School named after February 23 :-)
An its official name seems to be “八一•少年行”卫星 [“Bāyī•shàonián xíng” wèixīng].
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#81
by
edkyle99
on 28 Dec, 2016 21:43
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So this looks like a launch vehicle failure, with a possibility of the satellites salvaging themselves, though that remains to be seen. If not, they'll probably reenter in a few weeks.
I believe this is the first-ever CZ-2D launch vehicle failure since the type started flying in 1992.
Both of China's orbital launch vehicle failures this year from Taiyuan.
- Ed Kyle
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#82
by
vapour_nudge
on 28 Dec, 2016 22:41
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Spaceflightnow have posted a story on this too confirming the failure
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#83
by
baldusi
on 28 Dec, 2016 23:29
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If the satellites salvage themselves, it would be a partial failure?
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#84
by
edkyle99
on 28 Dec, 2016 23:47
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If the satellites salvage themselves, it would be a partial failure?
It all depends on the definition - and there is no common definition.
In my book it would be a
launch vehicle failure with the payloads inserted into an improper orbit. If the payloads are able to raise themselves to their planned orbits with propellant left for the mission, it would
not be a
mission failure. Similar to AV-009, CRS-1, STS-51F, etc.
- Ed Kyle
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#85
by
jcm
on 28 Dec, 2016 23:58
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If the satellites salvage themselves, it would be a partial failure?
It all depends on the definition - and there is no common definition.
In my book it would be a launch vehicle failure with the payloads inserted into an improper orbit. If the payloads are able to raise themselves to their planned orbits with propellant left for the mission, it would not be a mission failure. Similar to AV-009, CRS-1, STS-51F, etc.
- Ed Kyle
Agreed - mostly.
I am counting the launch vehicle as a 75% score (wrong but usable orbit) in my own arcane system which runs from 0% (blew up on pad) to 100% (all payloads separated in right orbit).
That does not, of course, mean that the payload customer would be 75% happy!
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#86
by
Steven Pietrobon
on 29 Dec, 2016 02:15
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I'm calling this one a partial failure, for the moment, since the satellites are in orbit. If the satellites can't get into a usable orbit, then it becomes a failure.
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#87
by
osiossim
on 29 Dec, 2016 03:51
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"usable" orbit should be typical sso for optical remote sensing, not this type of strange orbit.
Probably, the satellites are also designed to work in the typical sso, in terms of power budgets and imagery constraints. I dont know the satellite and the fuel mass but I have doubts if the onboard fuel will be enough to bring the satellites to any intended (target) sso.
Seems like he satellites are "unusable" at the moment an will not be able to return as much image as defined in their contracts.
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#88
by
jcm
on 29 Dec, 2016 03:54
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"usable" orbit should be typical sso for optical remote sensing, not this type of strange orbit.
Probably, the satellites are also designed to work in the typical sso, in terms of power budgets and imagery constraints. I dont know the satellite and the fuel mass but I have doubts if the onboard fuel will be enough to bring the satellites to any intended (target) sso.
Seems like he satellites are "unusable" at the moment an will not be able to return as much image as defined in their contracts.
My calculations indicate the sats *do* have enough prop to get to their target orbit.
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#89
by
jcm
on 29 Dec, 2016 03:55
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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)
Apparently Bayi is the school that Xi Jinping went to!
http://www.globaltimes.cn/content/1026290.shtml
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#90
by
input~2
on 29 Dec, 2016 06:10
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From the latest TLEs (epoch Dec 29, 05:20 UTC) , it appears that the perigee of Object B has been raised from 213 km to 262 km
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#91
by
input~2
on 29 Dec, 2016 08:51
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and now Object A as well:
Perigee raised from 214 km to 242 km (epoch Dec 29, 08:21 UTC)
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#92
by
Star One
on 29 Dec, 2016 12:23
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I wonder how much useful life they will lose having to achieve their orbits this way.
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#93
by
Phillip Clark
on 30 Dec, 2016 10:57
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Just a thought but I wonder whether the CZ-2D second stage was intended to de-orbit itself after the satellites deployed? If this was the case then the premature shut-down of the verniers prevented this.
Adding to the above after some more thought. Perhaps there was a programming error which led to the verniers being shut down at the same time as the main engine on the second stage? This could have prevented the verniers re-igniting to perform the de-orbit burn.
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#94
by
osiossim
on 30 Dec, 2016 11:30
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Perigee raised to 370 km and to 353 km for both satellites.
The life time increased a bit but, we do not know the configuration of the satellites. The questions remain such as;
1. How much fuel they have to correct the orbital injection error or
2. How much fuel they have to correct the LTAN or
3. How much fuel they need to get out from safe mode or escape from the sun etc.
Thus, the life time of the satellites and the concept of the mission could have been seriously degraded. Apart from that, the ground speed at this orbit is extreamly fast and the payload electronics' clock speed is slow to gather and process any usable data.
As a result, nothing could be gathered from this mission but if China will launch 24 of these satellites, it should not be a problem to lost 2 of them.
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#95
by
baldusi
on 30 Dec, 2016 13:41
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Working orbit was supposed to be a 500km SSO. They had a low perigee, but the apo was fine.
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#96
by
FutureSpaceTourist
on 30 Dec, 2016 14:50
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#97
by
input~2
on 30 Dec, 2016 14:57
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Perhaps there was a programming error which led to the verniers being shut down at the same time as the main engine on the second stage? This could have prevented the verniers re-igniting to perform the de-orbit burn.
Phillip, the verniers started as planned as can be seen in this graph from the launch video:
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#98
by
input~2
on 30 Dec, 2016 15:28
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#99
by
Phillip Clark
on 30 Dec, 2016 15:43
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Perhaps there was a programming error which led to the verniers being shut down at the same time as the main engine on the second stage? This could have prevented the verniers re-igniting to perform the de-orbit burn.
Phillip, the verniers started as planned as can be seen in this graph from the launch video:
In that case, does the video show how far into the burn the verniers shut down compared with the planned shut down?
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#100
by
input~2
on 30 Dec, 2016 16:02
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Perhaps there was a programming error which led to the verniers being shut down at the same time as the main engine on the second stage? This could have prevented the verniers re-igniting to perform the de-orbit burn.
Phillip, the verniers started as planned as can be seen in this graph from the launch video:
In that case, does the video show how far into the burn the verniers shut down compared with the planned shut down?
No, it cuts off one second after that frame!
check out 01mn42s-45s into this video:
http://tv.cctv.com/2016/12/28/VIDEcdy7e1C5BRXte9BZNzh8161228.shtml
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#101
by
Phillip Clark
on 30 Dec, 2016 16:07
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Usually the verniers start firing when the second stage ignites then then simply continue after the main engine shuts down. So, did they start on time and shut down almost at the same time as the main engine?
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#102
by
russianhalo117
on 30 Dec, 2016 17:21
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Working orbit was supposed to be a 500km SSO. They had a low perigee, but the apo was fine.
deployment and LEOPS orbit was supposed to be 530 km Circular SSO and operational IOC (first 4 sats) orbit was to be 500km after equal phasing was achieved between all of them.
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#103
by
input~2
on 30 Dec, 2016 18:52
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Usually the verniers start firing when the second stage ignites then then simply continue after the main engine shuts down.
AFAIU verniers are used for attitude correction (short duration burns) while the 2nd stage main engine is on and then after MECO for orbit circularization with continuous burn
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#104
by
Phillip Clark
on 30 Dec, 2016 19:00
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Usually the verniers start firing when the second stage ignites then then simply continue after the main engine shuts down.
AFAIU verniers are used for attitude correction (short duration burns) while the 2nd stage main engine is on and then after MECO for orbit circularization with continuous burn
My data are around 20 years old so the profile could have changed over the years.
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#105
by
input~2
on 30 Dec, 2016 19:51
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Situation at epoch December 30, 17:20 UTC:
Superview-1 01 in 407 x 527 km x 97.60°
Superview-1 02 in 422 x 528 km x 97.57°
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#106
by
input~2
on 31 Dec, 2016 07:24
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Situation at epoch December 31, ~05:35 UTC:
Superview-1 01 in 432 x 527 km x 97.61°
Superview-1 02 in 445 x 528 km x 97.57°
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#107
by
wsl2005
on 31 Dec, 2016 10:25
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#108
by
input~2
on 31 Dec, 2016 19:55
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Latest situation:
Superview-1 01 in 476 x 530 km x 97.61° epoch Dec 31, 18:15 UTC
Superview-1 02 in 487 x 530 km x 97.57° epoch Dec 31, 16:58 UTC
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#109
by
input~2
on 01 Jan, 2017 12:38
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Updated situation:
Superview-1 01 in 484 x 528 km x 97.61° epoch Jan 1, 06:36 UTC
Superview-1 02 in 509 x 533 km x 97.57° epoch Jan 1, 12:06 UTC
Superview-1 02 in 519 x 535 km x 97.57° epoch Jan 1, 15:11 UTC
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#110
by
input~2
on 02 Jan, 2017 05:58
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No significant change for both orbits as of epoch January 2, 03:00 UTC
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#111
by
ZachS09
on 02 Jan, 2017 06:43
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At least the SuperView satellites are trying their hardest to get to the right orbit.
I'm still aware of the shortened lifespan, but I'm proud of the satellites being salvaged.
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#112
by
osiossim
on 02 Jan, 2017 12:22
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Is it monopropellant (hydrazine) or is it electrical propulsion that brings the satellite close to desired orbit in such a short time?
Any information about this issue?
Also, I dont understand why the propellant tank is out of satellite's main body? If it would be hydrazine based, it shall have survival heaters around.
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#113
by
ZachS09
on 02 Jan, 2017 21:53
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Is it monopropellant (hydrazine) or is it electrical propulsion that brings the satellite close to desired orbit in such a short time?
Any information about this issue?
Also, I dont understand why the propellant tank is out of satellite's main body? If it would be hydrazine based, it shall have survival heaters around.
http://gbtimes.com/china/chinas-superview-1-satellites-begin-raise-orbits-after-rocket-underperformance"In response, using the
chemical propulsion on the satellite platforms designed by the China Academy of Space Technology, the satellites have apparently since performed burns to raise their orbits, raising their perigees by over 100km."
This chemical propulsion might as well be hydrazine.
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#114
by
input~2
on 07 Jan, 2017 19:33
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Orbits as of to-day:
Superview-1 01 in 517 x 536 km x 97.62°
Superview-1 02 in 518 x 536 km x 97.57°
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#115
by
Nordren
on 11 Jan, 2017 12:59
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#116
by
ZachS09
on 12 Jan, 2017 17:13
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#117
by
Steven Pietrobon
on 13 Jan, 2017 03:36
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I guess this means that all those countries that couldn't get imagery of certain areas from Western satellites, now won't have that problem.
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#118
by
Liss
on 19 Jan, 2017 11:25
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Just a thought but I wonder whether the CZ-2D second stage was intended to de-orbit itself after the satellites deployed? If this was the case then the premature shut-down of the verniers prevented this.
Adding to the above after some more thought. Perhaps there was a programming error which led to the verniers being shut down at the same time as the main engine on the second stage? This could have prevented the verniers re-igniting to perform the de-orbit burn.
It seems the second stage has been actually deorbited.
Check the attached image. At rear we see the upper composite lower section with the lower spaceraft inside, optical system partially visible. At forefront we see the upper section consisting of cylinder and conical adapter with upper spacecraft on it.
BY70-1 launch position is at the upper ring of the lower section at rear.
After the shroud is put on the upper section, the upper section is put onto the lower one.
So we should see in orbit the upper section -- there's no way to exit for the lower spacecraft and BY70-1 with it still attached to the second stage.
Since objects A, B and C are definitely spaceraft (A and B maneuvered and C is being heard), object D is this cylinder/conical section and the 2nd stage with lower section has been deorbited.
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#119
by
Liss
on 19 Jan, 2017 11:41
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#120
by
ืnewsman
on 22 Mar, 2017 04:04
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China Plus, March 22, 2017
Photo shows Ernst Happel Stadion in Vienna, capital of Austria. The reinforced structure can be seen clearly from the top of the arena from the picture. [Photo: China Aerospace Science and Technology Corporation]
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#121
by
ืnewsman
on 22 Mar, 2017 04:07
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Photo shows China's National Stadium, the "Birds Nest." Freestyle skiing tracks can be seen in the picture. SuperView-1 was built with a state-of-the-art control system and highly integrated electronics system. [Photo: China Aerospace Science and Technology Corporation]
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#122
by
ืnewsman
on 22 Mar, 2017 04:08
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Photo shows Xi'an Bell Tower in Shaanxi province. Driving directions for vehicles can be clearly seen in the picture. With the help of SuperView-1, websites such as Google, Baidu and AutoNavi can provide users with images of higher resolution and help the development of the map industry. [Photo: China Aerospace Science and Technology Corporation]
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#123
by
ืnewsman
on 22 Mar, 2017 04:09
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Photo shows the shore of Beihai in Guangxi Zhuang Autonomous Region. People can be seen clearly on the shore. Two more satellites of the SuperView-1 series will be launched by the end of 2017, which will reduce China's reliance on the use of foreign satellites. [Photo: China Aerospace Science and Technology Corporation]
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#124
by
ืnewsman
on 22 Mar, 2017 04:10
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Photo shows Burj Khalifa Tower in Dubai. The facilities in the water can be seen clearly from the picture. [Photo: China Aerospace Science and Technology Corporation]
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#125
by
ืnewsman
on 22 Mar, 2017 04:11
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Photo shows Ernst Happel Stadion in Vienna, capital of Austria. The reinforced structure can be seen clearly from the top of the arena from the picture. [Photo: China Aerospace Science and Technology Corporation]
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#126
by
ืnewsman
on 22 Mar, 2017 04:11
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#127
by
scissor snit
on 26 Jun, 2017 17:29
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Gaojing has been promoted as 0.5m but these are 1m images, can anyone verify whether Gaojing is actually capable of achieving half-meter resolution?
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#128
by
scissor snit
on 26 Jun, 2017 18:57
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Panchromatic (B&W) near-nadir imagery posted on Beijing Space's Facebook page is also 1m resolution.
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#129
by
SmallKing
on 27 Jun, 2017 14:09
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#130
by
SmallKing
on 09 Oct, 2017 13:13
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