Author Topic: LIVE: Chang'e-3 lunar probe and rover, CZ-3B - Xichang - December 1, 2013  (Read 316830 times)

Offline Blackstar

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This link was in the thread: http://news.cntv.cn/2013/12/09/VIDE1386560881527612.shtml
A new animation about the Chang'e landing sequence starts at 3:26

I just got a lot of pop-up ads there. Seems like a lot of spam.

Offline jumpjack

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I found the Chang'e3 microblogging site:
http://www.weibo.com/zkyzs

Latest news:
Quote
Tonight, Chang E III detector will be under the command of ground-based monitoring system, the implementation of orbital maneuvering, from the 100 km 100 km circular orbit, 100 kilometers into orbit by lowering 15 km elliptical orbit. The goal is to implement an elliptical orbit track power down before the last track adjustments made before is also a soft landing.
(Chrome translation)
http://www.weibo.com/3494982177/AmEaViSd5?mod=weibotime
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Offline Galactic Penguin SST

In other news Chang'e 3 will lower its orbit to 15 x 100 km at 13:20 UTC (i.e. in 15 minutes).
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline Galactic Penguin SST

In other news Chang'e 3 will lower its orbit to 15 x 100 km at 13:20 UTC (i.e. in 15 minutes).

And it has been done without issues.  :)
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline jumpjack

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Is there a shop in Beijing where you can buy these models from (And space envelopes?)

I'm going  Beijing soon

A-P
A simultation model of China's first moon rover - "Jade Rabiit" - is displayed at a market in Yiwu city, East China's Zhejiang province on Dec 3, 2013. (Photo/China Daily)
http://english.people.com.cn/90882/8475036.html
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Offline jumpjack

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In other news Chang'e 3 will lower its orbit to 15 x 100 km at 13:20 UTC (i.e. in 15 minutes).

And it has been done without issues.  :)
Source?
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Offline Apollo-phill

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Is there a shop in Beijing where you can buy these models from (And space envelopes?)

I'm going  Beijing soon

A-P
Try asking here:
http://bbs.9ifly.cn/thread-11199-1-1.html


OK THanks

Will try once have a good translation of web site

Thanxs

[Should really have posted in model forum ?]

A-P

Offline Galactic Penguin SST

Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline jumpjack

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Dozens of 1024x1024 images will be taken during descent/landing at over 10 FPS:
http://translate.googleusercontent.com/translate_c?depth=2&hl=it&ie=UTF8&prev=_t&rurl=translate.google.com&sl=auto&tl=en&u=http://bbs.9ifly.cn/forum.php%3Fmod%3Dredirect%26goto%3Dfindpost%26ptid%3D11199%26pid%3D278237&usg=ALkJrhhsYaZQkQMR4du63STt__LXVUZShA

There will be something like the "6 minutes of terros" on Mars, but they will be actually more than 10: 750 seconds of authomatic flight during which ground crew will not be able to do anything [I don't understand why, being the lag just 3 seconds].
http://www.chinadaily.com.cn/dfpd/shehui/2013-12/10/content_17165505.htm

The variable power engine can provide 1500 to 7500 "cattle cow" [???] [Was Apollo engine variable or just on/off?]

Zheng He is responsible for probe landing system.

Engine will be turned off 4 meters (12 feet) from ground to prevent dust from disturbing. The four legs will absorb impact and will adjust depending on terrain slope, tolerating up to 15 tilt.

http://www.chinadaily.com.cn/dfpd/shehui/2013-12/10/content_17165505_2.htm

Deorbiting details:
18:00 Start
18:37 Chang'e3 on far side of the Moon
21:20 Engine ignition
21:24 Operation successfully completed, Chang'e 3 in 100x15 orbit.


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Offline jumpjack

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I'm getting crazy to login to the chinese forum, my password gets messed up upon clicking the login button, does anybody of you have same problem? I can't see any image if I do not log in! :-(
-- Jumpjack --

Offline Galactic Penguin SST

Dozens of 1024x1024 images will be taken during descent/landing at over 10 FPS:
http://translate.googleusercontent.com/translate_c?depth=2&hl=it&ie=UTF8&prev=_t&rurl=translate.google.com&sl=auto&tl=en&u=http://bbs.9ifly.cn/forum.php%3Fmod%3Dredirect%26goto%3Dfindpost%26ptid%3D11199%26pid%3D278237&usg=ALkJrhhsYaZQkQMR4du63STt__LXVUZShA

There will be something like the "6 minutes of terros" on Mars, but they will be actually more than 10: 750 seconds of authomatic flight during which ground crew will not be able to do anything [I don't understand why, being the lag just 3 seconds].
http://www.chinadaily.com.cn/dfpd/shehui/2013-12/10/content_17165505.htm

The variable power engine can provide 1500 to 7500 "cattle cow" [???] [Was Apollo engine variable or just on/off?]

Zheng He is responsible for probe landing system.

Engine will be turned off 4 meters (12 feet) from ground to prevent dust from disturbing. The four legs will absorb impact and will adjust depending on terrain slope, tolerating up to 15 tilt.

http://www.chinadaily.com.cn/dfpd/shehui/2013-12/10/content_17165505_2.htm

Deorbiting details:
18:00 Start
18:37 Chang'e3 on far side of the Moon
21:20 Engine ignition
21:24 Operation successfully completed, Chang'e 3 in 100x15 orbit.

Here "cattle cow" = Newtons  ;)
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline savuporo

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A great series of tweets zooming in on the instruments on Chang'e-3

https://twitter.com/GuangLin_Galaxy/status/410528562563670016
more at
https://twitter.com/GuangLin_Galaxy
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Online Lar

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dropping the last 4 feet seems risky... how does this compare to other lunar landings? I didn't think the Apollo LEM cut engines that high up at all...
"I think it would be great to be born on Earth and to die on Mars. Just hopefully not at the point of impact." -Elon Musk
"We're a little bit like the dog who caught the bus" - Musk after CRS-8 S1 successfully landed on ASDS OCISLY

Offline Rocket Science

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dropping the last 4 feet seems risky... how does this compare to other lunar landings? I didn't think the Apollo LEM cut engines that high up at all...
The LEM Contact Probes were about 5 feet to signal the Contact Light and to cut engine... So its about right...

http://heroicrelics.org/info/lm/lunar-surface-probe.html
"The laws of physics are unforgiving"
~Rob, Physics instructor, aviator, vintage auto racer

Offline JimO

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Here "cattle cow" = Newtons  ;) 

As a rule of thumb for scale, the force of one Newton is about the weight of one apple on Earth. Good mnemonic trick.

Offline JimO

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A cheap plastic or even paper-to-be-built model would be interesting to me.

Or the maker files for my 3-D printer. I've already made my own globes of Deimos and Phobos to go with my big Mars globe. It shouldn't be too hard to make 8-10 assemblable pieces for the Yutu and/or lander.

Offline savuporo

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Or the maker files for my 3-D printer. I've already made my own globes of Deimos and Phobos to go with my big Mars globe...

Pics or it didnt happen ! :) ( or actually, do you have STL files ? My Makerbot is sitting idle .. )
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Offline cmj9808

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Is there a shop in Beijing where you can buy these models from (And space envelopes?)

I'm going  Beijing soon

A-P
Try asking here:
http://bbs.9ifly.cn/thread-11199-1-1.html


OK THanks

Will try once have a good translation of web site

Thanxs

[Should really have posted in model forum ?]

A-P

I'd like to recommend the following link , you can get some discount there ;)

http://bbs.9ifly.cn/thread-12876-1-1.html

Offline jumpjack

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Here "cattle cow" = Newtons  ;) 

As a rule of thumb for scale, the force of one Newton is about the weight of one apple on Earth. Good mnemonic trick.
I prefer "divide N by 10 and you get the weight" ;-)

A cheap plastic or even paper-to-be-built model would be interesting to me.

Or the maker files for my 3-D printer. I've already made my own globes of Deimos and Phobos to go with my big Mars globe. It shouldn't be too hard to make 8-10 assemblable pieces for the Yutu and/or lander.
Getting the 3d model for Chang'e will be as hard as it was for Sojourner model, because it was patented by Mattel; Chang'e 3 is patented too and only authorized (and paying) companies can have all the needed data to build a model. :-(
Anyway where can I find the printable Phobos and Deimos? :-)

dropping the last 4 feet seems risky... how does this compare to other lunar landings? I didn't think the Apollo LEM cut engines that high up at all...
The LEM Contact Probes were about 5 feet to signal the Contact Light and to cut engine... So its about right...

http://heroicrelics.org/info/lm/lunar-surface-probe.html
I'll go checking for weights, I think Apollo was much heavier due to the ascent stage and a bigger descent stage.
It would be interesting to find exact data about designed vertical landing speed. Maybe we could look for papers, interviews or posts from Zheng He, responsibile for landing system.

edit:
There's also Mei Tan, deputy commander of the detector system.
« Last Edit: 12/11/2013 07:03 AM by jumpjack »
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Offline NovaSilisko

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dropping the last 4 feet seems risky... how does this compare to other lunar landings? I didn't think the Apollo LEM cut engines that high up at all...

It was a bit of a drop on Apollo to be sure... check out what happened to 15's engine bell (top right) from the drop: http://commons.wikimedia.org/wiki/File:Apollo_15_Engine_Bell.jpg

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