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YG-5 YaoGan-5 launch December 15, 2008
by
Satori
on 14 Dec, 2008 01:00
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China will launch a new remote sensing satellite on December 15, 2008. The YG-5 YaoGan-5 will be launched from the Taiyuan Satellite Launch Center by a CZ-4B Chang Zheng-4B rocket.
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#1
by
Liss
on 14 Dec, 2008 09:44
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CZ-4B has never been used in launches of the Yaogan weixing family spacecraft. So I guess we'll see something new: heavier than YG-2/4 (CZ-2D) but more light than YG-1/3 (CZ-4C).
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#2
by
William Graham
on 14 Dec, 2008 11:02
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CZ-4B has never been used in launches of the Yaogan weixing family spacecraft. So I guess we'll see something new: heavier than YG-2/4 (CZ-2D) but more light than YG-1/3 (CZ-4C).
It could be a misprint, or they could have gone back to designating the 4C as 4B-II.
Yaogan-1 was originally reported to have been launched on a 4B, and IIRC, it wasn't until Yaogan-3 was launched that we learned a 4C (4B-II) had been used.
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#3
by
Phillip Clark
on 14 Dec, 2008 15:24
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Yaogan-1 was originally reported to have been launched on a 4B, and IIRC, it wasn't until Yaogan-3 was launched that we learned a 4C (4B-II) had been used.
When did it become known that the first Yaogan used the 4C and not the 4B which was announced at the time?
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#4
by
Liss
on 14 Dec, 2008 16:33
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It could be a misprint, or they could have gone back to designating the 4C as 4B-II.
Both Taiyuan CZ-4C launches occured at 22:48 UTC = 06:48 Beijing time. So if the same launch time is used, you may be correct.
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#5
by
Liss
on 14 Dec, 2008 16:42
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#6
by
William Graham
on 14 Dec, 2008 16:48
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When did it become known that the first Yaogan used the 4C and not the 4B which was announced at the time?
Can't easily find an English report but a Chinese one published in the China Space News newspaper on Nov 14, 2007, is here: http://www.china-spacenews.com/n435777/n435779/n435792/n601992/n602005/38846.html . The statement of the first launch in 2006 is in the third paragraph.
There was a 4B launch earlier this year.
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#7
by
Phillip Clark
on 14 Dec, 2008 17:33
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#8
by
jcm
on 14 Dec, 2008 17:41
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When did it become known that the first Yaogan used the 4C and not the 4B which was announced at the time?
Can't easily find an English report but a Chinese one published in the China Space News newspaper on Nov 14, 2007, is here: http://www.china-spacenews.com/n435777/n435779/n435792/n601992/n602005/38846.html . The statement of the first launch in 2006 is in the third paragraph.
There was a 4B launch earlier this year.
Igor, thanks for the link.
I'm still trying to understand these nomenclature systems. The 4B is referred to as
changzheng si hao yi
LongMarch 4 number 2
and the 4C is referred to as
changzheng si hao bing
LongMarch 4 number bing
where 'bing' is the third heavenly stem; I would have expected
*changzheng si hao san
for LM-4C instead; I am wondering if a better translation is LM-4-III.
Anyone understand why the switch to the 'heavenly stem' number system and how best to map that to English?
Jonathan
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#9
by
Phillip Clark
on 14 Dec, 2008 17:48
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Anyone understand why the switch to the 'heavenly stem' number system and how best to map that to English?
Jonathan
Hello Jonathan - Do you think that the Chinese are following the Russian path from the late 1980s and early 1990s when the Russians tried to confuse us to death with different designator systems?
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#10
by
jcm
on 14 Dec, 2008 17:50
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Yaogan-1 was originally reported to have been launched on a 4B, and IIRC, it wasn't until Yaogan-3 was launched that we learned a 4C (4B-II) had been used.
When did it become known that the first Yaogan used the 4C and not the 4B which was announced at the time?
The same article says that the 4B/4C main difference is a 2-burn third stage.
The 4C rocket ends up in a lower orbit than the payload, so I am guessing that
the second burn on these missions is a depletion burn, and that orbit insertion is with
a single burn to the final payload orbit. (Originally with YW-1 I thought the payload had made an orbit raise burn at first apogee).
Thoughts? Phil?
Jonathan
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#11
by
jcm
on 14 Dec, 2008 18:06
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Anyone understand why the switch to the 'heavenly stem' number system and how best to map that to English?
Jonathan
Hello Jonathan - Do you think that the Chinese are following the Russian path from the late 1980s and early 1990s when the Russians tried to confuse us to death with different designator systems?
I think they've been trying for decades but we've only become sophisticated enough to notice since the advent of online translators...
I would really like to go back and get pinyin versions of the satellite names in Chinese documents
all the way back to the first satellites, but I don't know how to go about it (I have Chinese printed stuff, but am useless without the online resources!)
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#12
by
Liss
on 14 Dec, 2008 22:53
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I'm still trying to understand these nomenclature systems. The 4B is referred to as
changzheng si hao yi
LongMarch 4 number 2
and the 4C is referred to as
changzheng si hao bing
LongMarch 4 number bing
where 'bing' is the third heavenly stem; I would have expected
*changzheng si hao san
for LM-4C instead; I am wondering if a better translation is LM-4-III.
Anyone understand why the switch to the 'heavenly stem' number system and how best to map that to English?
Too bad the forum can't show hieroglyphs. Maybe I'll make a try at NK -- ours can :-)
Shorthly, the CZ-4 family consists of
CZ-4A = chang zheng si hao jia
CZ-4B = chang zheng si hao yi
CZ-4C = chang zheng si hao bing
All the three designations end with a 'heavenly stem' hieroglyph. Next would be ding (as in CZ-2D). CZ-2E and CZ-2F usually have latin letters, not wu and ji.
The numbering sequence is yi - er - san - si - wu - liu -qi - pa - jiu - shi.
The yi = 1 in it is not the same as yi = B. Also, wu = 5 is not the same as wu = E.
Well, haven't ve had a launch by now? :-)
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#13
by
jcm
on 14 Dec, 2008 23:31
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The yi = 1 in it is not the same as yi = B. Also, wu = 5 is not the same as wu = E.
Aaaah, that explains part of my confusion, thanks!
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#14
by
Chris Bergin
on 14 Dec, 2008 23:32
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Too bad the forum can't show hieroglyphs. Maybe I'll make a try at NK -- ours can :-)
If you want, post it on NK, and link it here. I like NK. When I go on there via babblefish, My name translates into "Kris of Bergin". Makes me sounds like royality
Well, haven't ve had a launch by now? :-)
That's what I was wondering. Rui's got an article to go the news site, but no word of a launch yet.
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#15
by
Satori
on 14 Dec, 2008 23:49
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That's what I was wondering. Rui's got an article to go the news site, but no word of a launch yet.
Nope! No launch until this moment and I'm keeping an eye on the Chinese news sources... the other is looking at the War of the Worlds on portuguese TV!!!
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#16
by
wbhh
on 15 Dec, 2008 03:45
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#17
by
hesidu
on 15 Dec, 2008 04:36
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Actually, there are four CZ-4 in the family.
长征4号 (CZ-4)
长征4号甲 (CZ-4A)
长征4号乙 (CZ-4B)
长征4号丙 (CZ-4C)
长征4号甲,长征4号乙,长征4号丙 are in service now. 长征4号(CZ-4) was a GTO launcher, which can lift 1.25ton to the GTO orbit. The development started in 1979, but stopped in 1982, maybe because lack of payload. The project was shift to develop SSO launcher -- 长征4号甲 (CZ-4A). 长征4号甲 (CZ-4A) first launched weather satellite FY-1 in 1988/9/7. 1989/2 China started to develop 长征4号乙 (CZ-4B), a more powerful SSO launcher which is used to launch earth observation satellites. 长征4号丙 (CZ-4C) first launched YG-1 in 2006/4/27.
甲(jia) = first, 乙(yi) = second, 丙(bing) = third, 丁(ding) = forth, 戊(wu) = fifth, 己(ji) = sixth, 庚(geng) = seventh, 辛(xin) = eighth, 壬(ren) = ninth, 癸(kui) = tenth
一(yi) = one, 二(er) = two, 三(san) = three, 四(si) = four, 五(wu) = five, 六(liu) = six, 七(qi) = seven, 八(ba) = eight, 九(jiu) = nine, 十(shi) = ten
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#18
by
Liss
on 15 Dec, 2008 05:40
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Actually, there are four CZ-4 in the family.
长征4号 (CZ-4)
长征4号甲 (CZ-4A)
长征4号乙 (CZ-4B)
长征4号丙 (CZ-4C)
Well, why did I think it's impossible? Thanks, hesidu.
长征4号甲,长征4号乙,长征4号丙 are in service now. 长征4号(CZ-4) was a GTO launcher, which can lift 1.25ton to the GTO orbit. The development started in 1979, but stopped in 1982, maybe because lack of payload. The project was shift to develop SSO launcher -- 长征4号甲 (CZ-4A).
Igor Afanasiev believes that the initial CZ-4 was a backup project to CZ-3, and as soon as it became obvious that CZ-3 was to fly soon, the CZ-4 was redirected to CZ-4A SSO launcher.
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#19
by
Satori
on 15 Dec, 2008 09:28
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#20
by
Chris Bergin
on 15 Dec, 2008 09:42
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#21
by
William Graham
on 15 Dec, 2008 09:43
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The images suggest that the launch was from the newer pad at TSLC.
The payload fairing is of the type used on the CZ-4C. I haven't seen it used on a 4B before - this could support my theory that this was a 4C not a 4B. We'll have a better idea when the orbits are published.
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#22
by
jcm
on 15 Dec, 2008 13:50
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The images suggest that the launch was from the newer pad at TSLC.
The payload fairing is of the type used on the CZ-4C. I haven't seen it used on a 4B before - this could support my theory that this was a 4C not a 4B. We'll have a better idea when the orbits are published.
Want to bet?
Yaogan Weixing 5 480 x 492 km x 97.4
CZ stage 360 x 486 km x 97.3
So, I tend to agree CZ-4C but the lower orbit compared to other YW satellites
does complicate things...
Jonathan
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#23
by
Phillip Clark
on 15 Dec, 2008 15:13
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The initial orbital data and the launch time for Yaogan 5 look very similar to those seen for the three Jianbing-3/Ziyuan-2 satellites.
Could Yaogan 5 be the first in a Jianbing-3B (or even Jianbing-7??!!) follow-on satellite series?
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#24
by
Satori
on 15 Dec, 2008 15:47
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Could Yaogan 5 be the first in a Jianbing-3B (or even Jianbing-7??!!) follow-on satellite series?
Many months ago a source in China told me that the first Jian Bing-7 was going to be the YaoGan-5.
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#25
by
Phillip Clark
on 15 Dec, 2008 15:58
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Could Yaogan 5 be the first in a Jianbing-3B (or even Jianbing-7??!!) follow-on satellite series?
Many months ago a source in China told me that the first Jian Bing-7 was going to be the YaoGan-5.
It looks as if the third of the Jianbing-3/Ziyuan-2 satellites was moved well away from the Jianbing-3 operating altitude, with an apparently final orbit being reached about a month ago. Clearing the skies for the second generation satellite, perhaps?
And if both Jianbing-6 and Jianbing-7 are photo imaging satellites, I wonder how they compare. Different platforms, presumably: maybe the higher JB6 orbit is for area survey work and the lower JB7 orbit is for close look work?
BTW, has anyone seen a photograph or description of the CAST-2000 platform which apprently JB-6/Yaogans 2 and 4 use?
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#26
by
Liss
on 15 Dec, 2008 16:13
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The initial orbital data and the launch time for Yaogan 5 look very similar to those seen for the three Jianbing-3/Ziyuan-2 satellites.
Could Yaogan 5 be the first in a Jianbing-3B (or even Jianbing-7??!!) follow-on satellite series?
Very good observation!
It's a matter of agreement what to name Jianbing 7. Two years ago, JB-5 and JB-7 could be occasionally found on the net while mentions of JB-6 existed only in fantastic novels :-)
Now the extremist sort of observers tend to believe the following:
Yaogan weixing 1 = JB-5
Yaogan weixing 2 = JB-6
Yaogan weixing 3 = JB-7
Yaogan weixing 4 = JB-8
Yaogan weixing 5 = JB-9 :-)
My understanding is that we don't need such a set of designations. My feeling is that YW-1 and YW-3 are JB-5s, YW-2 and YW-4 are JB-6s, and YW-5 looks a good candidate for JB-7.
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#27
by
jcm
on 15 Dec, 2008 17:50
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The initial orbital data and the launch time for Yaogan 5 look very similar to those seen for the three Jianbing-3/Ziyuan-2 satellites.
Could Yaogan 5 be the first in a Jianbing-3B (or even Jianbing-7??!!) follow-on satellite series?
Very good observation!
It's a matter of agreement what to name Jianbing 7. Two years ago, JB-5 and JB-7 could be occasionally found on the net while mentions of JB-6 existed only in fantastic novels :-)
Now the extremist sort of observers tend to believe the following:
Shiyan weixing 1 = JB-5
Shiyan weixing 2 = JB-6
Shiyan weixing 3 = JB-7
Shiyan weixing 4 = JB-8
Shiyan weixing 5 = JB-9 :-)
My understanding is that we don't need such a set of designations. My feeling is that SW-1 and SW-3 are JB-5s, SW-2 and SW-4 are JB-6s, and SW-5 looks a good candidate for JB-7.
I think maybe you mean YW not SW??
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#28
by
Liss
on 15 Dec, 2008 18:15
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I think maybe you mean YW not SW??
Of course. Have corrected the posting.
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#29
by
Phillip Clark
on 15 Dec, 2008 18:20
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It looks as if the third of the Jianbing-3/Ziyuan-2 satellites was moved well away from the Jianbing-3 operating altitude, with an apparently final orbit being reached about a month ago. Clearing the skies for the second generation satellite, perhaps?
And if both Jianbing-6 and Jianbing-7 are photo imaging satellites, I wonder how they compare. Different platforms, presumably: maybe the higher JB6 orbit is for area survey work and the lower JB7 orbit is for close look work?
BTW, has anyone seen a photograph or description of the CAST-2000 platform which apprently JB-6/Yaogans 2 and 4 use?
Plus the obvious connection. The Jianbing-3 satellites used the CZ-4B for Taiyuan, as did Yaogan 5.
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#30
by
Liss
on 15 Dec, 2008 20:14
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BTW, has anyone seen a photograph or description of the CAST-2000 platform which apprently JB-6/Yaogans 2 and 4 use?
An answer not exactly to your question but here
http://v.cctv.com/html/xinwenlianbo/2008/12/xinwenlianbo_300_20081215_14.shtml you can see the launch and the 3D graphics of orbit insertion and the satellite with two solar panels in deployment. Can't judge if the graphics represent the real bird.
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#31
by
edkyle99
on 15 Dec, 2008 20:23
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The images suggest that the launch was from the newer pad at TSLC.
The payload fairing is of the type used on the CZ-4C. I haven't seen it used on a 4B before - this could support my theory that this was a 4C not a 4B. We'll have a better idea when the orbits are published.
Want to bet?
Yaogan Weixing 5 480 x 492 km x 97.4
CZ stage 360 x 486 km x 97.3
So, I tend to agree CZ-4C but the lower orbit compared to other YW satellites
does complicate things...
Jonathan
Xinhua says CZ-4B. Did Xinhua say CZ-4C for the previous Yaogan launches from Taiyuan, or did it specify CZ-4B for those?
As for the new launch pad, I would suggest this spot as one candidate for its location, shown under construction on Google about 2 km north-northwest of the original CZ-4 pad.
http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.863428+N,+111.589004+E&sll=38.863428,111.589004&sspn=0.003926,0.010632&ie=UTF8&ll=38.86342,111.592512&spn=0.007853,0.013111&t=k&z=16&g=38.863428+N,+111.589004+E&iwloc=addrAnother spot might be the site of an older pad located about 1.5 km south of the original CZ-4 pad.
http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.836348+N,+111.605816+E&sll=38.836348,111.605816&sspn=0.003928,0.010632&ie=UTF8&ll=38.836348,111.609313&spn=0.007856,0.013111&t=k&z=16&g=38.836348+N,+111.605816+E&iwloc=addrWhile we're all staring at Taiyuan, has anyone else noticed what appears to be a really, really big hole in the ground?
http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.859406+N,+111.602758+E&sll=38.859406,111.602758&sspn=0.001963,0.005316&ie=UTF8&ll=38.85941,111.606245&spn=0.007853,0.013111&t=k&z=16&g=38.859406+N,+111.602758+E&iwloc=addr - Ed Kyle
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#32
by
Phillip Clark
on 15 Dec, 2008 23:55
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An answer not exactly to your question but here http://v.cctv.com/html/xinwenlianbo/2008/12/xinwenlianbo_300_20081215_14.shtml you can see the launch and the 3D graphics of orbit insertion and the satellite with two solar panels in deployment. Can't judge if the graphics represent the real bird.
Thank you, Igor! Don't those two imaging systems on the satellite remind you of the pair carried on the front of the Shenzhou 5 orbital module? Could be a coincidence, of course.
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#33
by
hesidu
on 16 Dec, 2008 00:14
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I still don't think YG series have much military applications. I think the images got from those satellites were still low resolution and have little military value. One Chinese scientist said that China's remote sensing technology was still behind India last year. And according to the white paper published by CNSA in 2006, China was going to develop high resolution earth observation satellites in this five years plan. This is only the second year of this five years plan, I don't think those satellites can be developped that quickly.
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#34
by
hesidu
on 16 Dec, 2008 00:37
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#35
by
osiossim
on 16 Dec, 2008 07:34
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#36
by
tonthomas
on 16 Dec, 2008 16:53
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Maybe it will look like these later:
http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.859406+N,+111.602758+E&sll=38.859406,111.602758&sspn=0.001963,0.005316&ie=UTF8&t=k&g=38.859406+N,+111.602758+E&ll=38.867939,111.6019&spn=0.002828,0.004672&z=18http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.859406+N,+111.602758+E&sll=38.859406,111.602758&sspn=0.001963,0.005316&ie=UTF8&t=k&g=38.859406+N,+111.602758+E&ll=38.829311,111.598971&spn=0.002829,0.004672&z=18http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.859406+N,+111.602758+E&sll=38.859406,111.602758&sspn=0.001963,0.005316&ie=UTF8&t=k&g=38.859406+N,+111.602758+E&ll=38.804199,111.609378&spn=0.00283,0.004672&z=18http://maps.google.com/maps?f=q&hl=en&geocode=&q=38.859406+N,+111.602758+E&sll=38.859406,111.602758&sspn=0.001963,0.005316&ie=UTF8&t=k&g=38.859406+N,+111.602758+E&ll=38.730736,111.610059&spn=0.002833,0.004672&z=18Large silo or special underground waste disposal?
Thomas
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#37
by
tonthomas
on 16 Dec, 2008 17:24
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In Urumqi Northwest of China as well:
Launchpad?
http://maps.google.de/maps?f=q&hl=de&geocode=&q=Urumqi&sll=51.151786,10.415039&sspn=18.698556,38.276367&ie=UTF8&ll=43.844223,87.579526&spn=0.002619,0.004672&t=h&z=18http://maps.google.de/maps?f=q&hl=de&geocode=&q=Urumqi&sll=51.151786,10.415039&sspn=18.698556,38.276367&ie=UTF8&t=h&ll=43.702734,87.553332&spn=0.002688,0.004603&z=18Tanking in earth?
http://maps.google.de/maps?f=q&hl=de&geocode=&q=Urumqi&sll=51.151786,10.415039&sspn=18.698556,38.276367&ie=UTF8&t=h&ll=43.725181,87.594767&spn=0.005373,0.009205&z=17&iwloc=addr
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#38
by
Liss
on 18 Dec, 2008 20:52
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According to CCTV4, launch time of Yaogan Weixing-5 was 03:22:04.521 UTC:
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#39
by
wbhh
on 19 Dec, 2008 10:00
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#40
by
Phillip Clark
on 26 Dec, 2008 09:17
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Yaogan 5/Jianbing-7 1 reached its 94.44 minutes, 488-495 km operating orbit on December 20th. The same operational orbital period was used by the three Ziyuan-2/Jianbing-3 satellites, although there were very minor differences in their orbital eccentricities which resulted in the apogee and perigees being a few km different.
I have been looking into the possible repeating orbit patterns fo this orbital altitude and there are three possibilities, since the satellites operate in a 94.42-94.44 minutes orbit, with periodic orbital manoeuvres back to the higher period:
94.42 minutes - 442 circuits (29 days)
94.43 minutes - 381 circuits (25 days)
94.44 minutes - 320 circuits (21 days)
It isn't possible to be dogmatic and say which pattern is actually intended for these satellites because a small change in the orbital period will change the repeating pattern.
I believe that it is clear that the manoevres which I mentioned earlier for the last Jianbing-3 satellite were times to have cleared this orbital regime before the flight of what appears to be a second-generation digital photoreconnaissance satellite.
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#41
by
Liss
on 07 Jan, 2009 13:38
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BTW, has anyone seen a photograph or description of the CAST-2000 platform which apprently JB-6/Yaogans 2 and 4 use?
Phillip, try
http://www.cast.cn/uploadfiles/casten/product/book1.swf for images and some data on TTS-1/Phoenix Eye-1, TTS-2/Phoenix Eye-2, DJS-1/DFH-3, DHF-3A, DJS-2/DFH-4, CAST-968, CAST-2000, CAST-Mini and FSW buses.
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#42
by
Liss
on 07 Jan, 2009 13:43
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The payload fairing is of the type used on the CZ-4C. I haven't seen it used on a 4B before - this could support my theory that this was a 4C not a 4B.
In fact, launch vehicles for ZY-2-03 (2004) and YG-5 (2008) did have the same payload fairing. At least photos talk me this.
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#43
by
Liss
on 07 Jan, 2009 22:21
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Yaogan 5/Jianbing-7 1 reached its 94.44 minutes, 488-495 km operating orbit on December 20th.
I have been looking into the possible repeating orbit patterns fo this orbital altitude and there are three possibilities, since the satellites operate in a 94.42-94.44 minutes orbit, with periodic orbital manoeuvres back to the higher period:
94.42 minutes - 442 circuits (29 days)
94.43 minutes - 381 circuits (25 days)
94.44 minutes - 320 circuits (21 days)
It isn't possible to be dogmatic and say which pattern is actually intended for these satellites because a small change in the orbital period will change the repeating pattern.
Well, my understanding is that the actual nodal period ZY-2 satellites used was very close to 94.50 minutes with variations of only 2 seconds and 1.5 km in height. And 94.50 minutes is exactly 320 orbits in 21 days.
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#44
by
Phillip Clark
on 08 Jan, 2009 04:27
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Well, my understanding is that the actual nodal period ZY-2 satellites used was very close to 94.50 minutes with variations of only 2 seconds and 1.5 km in height. And 94.50 minutes is exactly 320 orbits in 21 days.
Sorry Igor, but while these satellites were operating the anomalistic orbtal periods were 94.44/94.45 minutes, decay to 94.41 minutes (occasionally 94.39 minutes) and then boosted back to ~94.45 minutes. Stayed that way throughout the Jianbing-3/Ziyuan-2 lifetimes.
And many thanks for the link to the CAST page with the satellite platform data. Very interesting information - which that the launch masses were given in all cases, rather than the payload packages which can be supported by the platforms.
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#45
by
Liss
on 10 Jan, 2009 15:34
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Well, my understanding is that the actual nodal period ZY-2 satellites used was very close to 94.50 minutes with variations of only 2 seconds and 1.5 km in height. And 94.50 minutes is exactly 320 orbits in 21 days.
Sorry Igor, but while these satellites were operating the anomalistic orbtal periods were 94.44/94.45 minutes, decay to 94.41 minutes (occasionally 94.39 minutes) and then boosted back to ~94.45 minutes. Stayed that way throughout the Jianbing-3/Ziyuan-2 lifetimes.
I do not want to be dogmatic as well but you probably refer to the period defined as 1440 / (mean motion figure from TLE). I refer to actual nodal period obtained by propagating an elset for one orbit and calculating times of two consecutive equartor crossings. And, by chance, 320 orbits of this 94.50 min period is exactly 21 days.
Glad to hear you've liked the platforms book.
By the way, putting aside the question wether Yaogan Weixing 3 was Jianbing 7 or not, what do you think of Yaogan Weixing 5 being Jianbing 8?
I stepped down from my earlier understanding that YG-5 is JB-7 because the latter has been described as something alike JB-5 and made by SAST. And we know now that YG-5 was made by CAST and it is obviously not a SAR bird.
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#46
by
blackjack
on 19 Jan, 2009 23:54
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I still don't think YG series have much military applications. I think the images got from those satellites were still low resolution and have little military value. One Chinese scientist said that China's remote sensing technology was still behind India last year. And according to the white paper published by CNSA in 2006, China was going to develop high resolution earth observation satellites in this five years plan. This is only the second year of this five years plan, I don't think those satellites can be developped that quickly.
It's a way to get fundings from government such as NASA did. NASA would say the technolgy of China would go beyond States when they wanted to get fundings from US government. As I seen the anylasis of public news from a technological Chinese website(
www.9ifly.cn), the resolution of YG5 is about 0.7m-0.8m.
Here is the discussion if you can understand Chinese.
http://www.9ifly.cn/sub/viewthread.php?tid=355&extra=&page=1
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#47
by
hesidu
on 24 Jan, 2009 11:04
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I don't think informantion from Chinese forums are reliable. Since most of Chinese space programs are highly confidential. So I don't think ordinary Chinese know much about the truth.
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#48
by
blackjack
on 24 Jan, 2009 19:53
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I don't think informantion from Chinese forums are reliable. Since most of Chinese space programs are highly confidential. So I don't think ordinary Chinese know much about the truth.
You have to judge the information from forums by yourself. Some comments in the forum I pointed out are very professional, I think some of them are working in the industry.
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#49
by
Satori
on 26 Jan, 2009 21:05
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Sinodefense is giving the following military designations for the YaoGan Weixing satellites:
YG-1 - JianBing-5
YG-2 - JianBing-6
YG-3 - JianBing-7
YG-4 - JianBing-8
YG-5 - JianBing-9
It also points that YG-1, YG-3 and YG-5 are SAR radar imaging satellites and that YG-2 and YG-4 are Electro-optical satellites.
Any comments on this?
Thanks!
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#50
by
Liss
on 10 Feb, 2009 08:29
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The initial orbital data and the launch time for Yaogan 5 look very similar to those seen for the three Jianbing-3/Ziyuan-2 satellites.
By the way, Aerospace China published in the December 2008 issue the first part of an article on China's Earth Resource Satellites (in Chinese). Two B&W pictures are included, one of Ziyuan-2 satellite in orbit and another of three ZY-2s phased in orbit at 120°. (This structure did exist in late 2004 but for only 10 days or so.)
Aerospace China is accessible at
http://www.space.cetin.net.cn/docs/ht97-b.htm but only through Jan 2005.
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#51
by
Liss
on 10 Feb, 2009 08:32
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Sinodefense is giving the following military designations for the YaoGan Weixing satellites:
YG-1 - JianBing-5
YG-2 - JianBing-6
YG-3 - JianBing-7
YG-4 - JianBing-8
YG-5 - JianBing-9
It also points that YG-1, YG-3 and YG-5 are SAR radar imaging satellites and that YG-2 and YG-4 are Electro-optical satellites.
Any comments on this?
Thanks!
My understanding is as follows:
YG-1 - JianBing-5 radar
YG-2 - JianBing-6 optical
YG-3 - JianBing-5 radar
YG-4 - JianBing-6 optical
YG-5 - JianBing-8? optical
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#52
by
Satori
on 16 Aug, 2011 22:23
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#53
by
input~2
on 06 Dec, 2011 15:54
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According to USSTRATCOM, the third stage of CZ-4B re-entered to-day at 0005:00UTC +/- 1 minute over the North Pacific some 1460 km NW of Oahu after 16,906 revolutions.
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#54
by
input~2
on 28 Aug, 2014 11:45
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Yaogan-5 is predicted to reenter September 1 to 3
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#55
by
Star One
on 29 Aug, 2014 15:06
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#56
by
input~2
on 29 Aug, 2014 18:30
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Space-Track latest prediction for the reentry time:
September 1, 16:45UTC +/- 8.5 hours
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#57
by
input~2
on 31 Aug, 2014 07:30
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Space-Track latest prediction for the reentry time:
September 2, 19:32UTC +/- 24 hours
Aerospace Corp.latest prediction:
September 2, 16:47UTC +/- 21 hours
Edit as of Sept 1, 0630UTC:
Space-Track latest prediction for the reentry time:
September 2, 20:04UTC +/- 12 hours
Aerospace Corp. latest prediction:
September 3, 04:33UTC +/- 16 hours
Edit as of Sept 2, 1410UTC:
Space-Track latest prediction for the reentry time:
September 2, 20:46UTC +/- 4 hours
Aerospace Corp. latest prediction:
September 2, 20:35UTC +/- 9 hours
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#58
by
russianhalo117
on 02 Sep, 2014 23:19
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#59
by
input~2
on 03 Sep, 2014 07:43
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According to USSTRATCOM Yaogan-5 reentered on September 2 at 20:30UTC over 47S 52E (Southern Indian Ocean)
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#60
by
A.Nemo
on 05 Sep, 2014 06:58
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Sinodefense is giving the following military designations for the YaoGan Weixing satellites:
YG-1 - JianBing-5
YG-2 - JianBing-6
YG-3 - JianBing-7
YG-4 - JianBing-8
YG-5 - JianBing-9
It also points that YG-1, YG-3 and YG-5 are SAR radar imaging satellites and that YG-2 and YG-4 are Electro-optical satellites.
Any comments on this?
Thanks!
YG-3 is YG1 02，and YG-10 is YG1 03
