Author Topic: LIVE: Chang'e-2 (China's second lunar probe) - Long March 3C - October 1, 2010  (Read 187713 times)

Online savuporo

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Offline wbhh

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went into moon orbit
119.399 km x 8599.187 km
during 32 minutes
« Last Edit: 10/07/2010 02:27 PM by wbhh »

Offline jcm

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Good news. Can anyone translate the information on 6.jpg ? (with the vallues 113.4 and 102.4?) I am wondering if one of these might be the orbital inclination.
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Offline wbhh

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on 5.jpg
perilune: 119.399 km
apolune: 8599.187 km
velocity increment: 414.030 m/s

on 6.jpg
perilune: 113.424 km
velocity increment: 102.440 m/s
:)
« Last Edit: 10/08/2010 05:54 AM by wbhh »

Offline Phillip Clark

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I am assuming that in the above entries perilune and apolune are interchanged.

Figure 5 must relate to the first lunar orbit injection burn (LOI-1), and two others are planned.   It is not clear whether Figure 6 relates to the LOI-2 burn to a near-circular 120 km orbit and then perhaps LOI-3 is to be the manoeuvre to a 100-15 km orbit.   Or whether two further LOI burns will take place before the manoeuvre to the 15 km perislene altitude.

Offline Apollo-phill

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Thanks wbbh for posting lunar insertion images - great stuff.

Keep on orbiting  :)


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Offline jcm

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on 5.jpg
apolune: 119.399 km
perilune: 8599.187 km
velocity increment: 414.030 m/s

on 6.jpg
apolune: 113.424 km
velocity increment: 102.440 m/s
:)

Thank you! Oh well... an inclination value was too much to hope for I guess :-)
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Offline Phillip Clark

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According to a report from ANI posted on the China-Defense.com web site, Chang'e 3 will be launched from the Wenchang site "before 2013".

Online savuporo

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http://www.spacedaily.com/reports/Four_Chinese_Lunar_Landers_Mooted_999.html

Quote
We expect that the first lander will fly around the year 2012. Chinese media statements have been cautious about the timetable in recent years, suggesting a launch in 2013. However, the case for a 2012 launch seems to be getting stronger. Phrases such as "before 2013" or "around 2012" are appearing. It would seem that the development of the landing platform and its rover are fairly on-track.

This is exciting stuff ! This is FINALLY getting back to the moon. Nobody has landed there since 1976 ....
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Offline SpaceHero

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According to a report from ANI posted on the China-Defense.com web site, Chang'e 3 will be launched from the Wenchang site "before 2013".

I doubt its possibility. WenChang site is still under construction and three years is too difficult for it to be ready. Chang'e 3 may be launched in late 2012 or early 2013 but not from WenChang.
If not now, then when;
if not here, then where.

Offline Apollo-phill

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Sinus Iridum(Iridium) - target for Chang'e-3 landing - is currently in 'darkness' and will not be back in sunlight until 17-18th October 2010.

This will give the Chinese about 10 days to 'shakedown' science kit onboard Chang'e-2 and establish the lower orbit before the "first"  opprtunities become available for Sinus Iridum landing site imaging .

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Offline wbhh

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yesterday the inclination was changed 3.2 degree, and lower the perilune to 86km, during 10 minutes, no more detail.
(news in chinese) http://news.sina.com.cn/c/2010-10-08/001021228922.shtml

today lower the apolune from 8631km to 1830km, during 17 minutes.
(video) http://video.sina.com.cn/p/news/c/v/2010-10-08/121661154937.html
« Last Edit: 10/08/2010 06:03 AM by wbhh »

Offline spacex

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China's second lunar probe completes final braking, enters working orbit
http://news.xinhuanet.com/english2010/china/2010-10/09/c_13548648.htm

Offline cd-slam

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According to a report from ANI posted on the China-Defense.com web site, Chang'e 3 will be launched from the Wenchang site "before 2013".

I doubt its possibility. WenChang site is still under construction and three years is too difficult for it to be ready. Chang'e 3 may be launched in late 2012 or early 2013 but not from WenChang.

Per the SpaceDaily article quoted by savuporo, Chang'e 3 (lunar lander/rover) is within the capability of Long March 3B. However future sample return mission (Chang'e 4 or 5) will require Long March 5 from Wenchang - this mission date is around 2017 to 2020.

With Chandrayaan 2 also coming in 2013, this is really cool stuff! 8)

Offline Satori

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Online savuporo

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So they will have plenty of fuel left in the tank after primary mission.
They could lower the orbit a LOT and try and keep it stable at very low altitude for some period, even in the face of irregular gravity.

That would give it a chance to do some really detailed photo ops.

Lagrange point option going on into a deep space test would be really interesting too.
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Offline Apollo-phill

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Tomorrow,16th October 2010, sees the Moon's Sinus Iridum entering into "illumination" again.

Maybe we will have further information from China's space Agency about Chang'e-2 and whether it will start taking images of this intended landing site zone for Chang'e-3 ?


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Offline Apollo-phill

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Remarkably quiet on this Chinese Chang'e-2 mission from China ?

I'd have thought they would have been jumping up and down eager to show off first images and data now the prime Chang'e-3 landing site of Sinus Iridum  is illuminated once more ?


Apollo-phill