Author Topic: LIVE: Chang'e-3 lunar probe and rover Lunar Landing December 14, 2013  (Read 455555 times)

Offline plutogno

  • Full Member
  • ****
  • Posts: 717
  • Toulouse, France and Milan, Italy
  • Liked: 113
  • Likes Given: 6
in the latest issue of the Chinese Journal of Space Science: Chang’E-3 Lander’s scientific payloads
the full paper is not yet available, but it should be in a few days
« Last Edit: 03/04/2014 05:07 PM by plutogno »

Offline Apollo-phill

  • Full Member
  • ****
  • Posts: 452
  • UK
  • Liked: 67
  • Likes Given: 6
Just a couple days to go before Change'3/Yutu are bathed in sunlight again - so will be interesting time see if either/both respond to commands again.

Hope they do !

A-P

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 893
  • Bulgaria
  • Liked: 284
  • Likes Given: 38
When is the probe expected to wake up?

Offline Phil Stooke

  • Full Member
  • ***
  • Posts: 339
  • Canada
  • Liked: 191
  • Likes Given: 0
Maybe two days after sunrise, so in 3 or 4 days.  Originally Yutu would have one solar panel tilted down, nearly vertical, and turned to face the rising sun.  Now it cannot tilt the panel or turn the rover so it must wait for the sun to rise high enough to shine on the solar panel.

Phil

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 893
  • Bulgaria
  • Liked: 284
  • Likes Given: 38
UHF Satcom reports no signals from the Moon so far - neither downlink, nor uplink signals:

https://twitter.com/uhf_satcom

1. Just had a quick check for X-Band signals off the Moon - nothing from either Yutu or the Chang'e 3 lander downlinks, no sign of 7GHz uplinks

2. Despite hours of observations, nothing but thermal noise detected from the Moon tonite - Yutu and Chang'e 3 all quiet, no 7.2GHz EME either.

Offline Hungry4info3

  • Full Member
  • ****
  • Posts: 432
  • Liked: 23
  • Likes Given: 13
This site seems to imply the rover has survived.
http://news.163.com/14/0312/19/9N5KNCJ300014JB6.html

Quote
中新社北京3月12日电 “‘玉兔’现在状态很好,预计还可以超期服役很长时间。”全国政协委员、中国航天科工集团第三研究院院长魏毅寅12日在北京接受中新社记者采访时透露。
...
魏毅寅告诉记者,尽管“玉兔”的设计寿命将至,但是它现在状态很好,此前生病但已经被唤醒,预计使用寿命将比设计寿命长很多。
Quote
China news agency, Beijing, March 12 - "'Rabbit' is now in good shape, you can also expect extended service a long time." CPPCC National Committee, China Aerospace Science and Industry Group's third dean Weiyi Yin accepted in Beijing on the 12th News Agency reporter that interview.
...
Weiyi Yin told reporters that despite the "rabbit" design life is approaching, but it is now in good shape, had been sick but wake up, long life than expected design life of many.

Offline jumpjack

  • Full Member
  • **
  • Posts: 245
  • rome-italy
  • Liked: 1
  • Likes Given: 0
THIS is great news! I wonder how long it will take for traditional media to get to it. ;-)
-- Jumpjack --

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 893
  • Bulgaria
  • Liked: 284
  • Likes Given: 38
https://twitter.com/uhf_satcom

1. Hmm a funny thing happened whilst listening for Yutu! A 'spur' that I discounted has Doppler, and is coming from the Moon... So I have investigated this a bit more, and its been there for the past 3 days... http://pjm.uhf-satcom.com/twtr/8462040.jpg … is the FFT 40KHz below Yutu's freq


2. http://pjm.uhf-satcom.com/twtr/8462040.jpg

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 893
  • Bulgaria
  • Liked: 284
  • Likes Given: 38
Quote :

Well, this may well be a downlink from Yutu rover in some 'emergency' mode... Its either very low rate data or something is broken...

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 893
  • Bulgaria
  • Liked: 284
  • Likes Given: 38
This is the signal:

http://pjm.uhf-satcom.com/twtr/8462040b.jpg

We don't know what's the meaning of this low frequency signal. Really.  Guess we should wait official sources...

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 893
  • Bulgaria
  • Liked: 284
  • Likes Given: 38
From twitter:

Ah telemetry is back from Yutu, looks pretty bad... and certainly nowhere near as strong as previously, Maybe being commanded... will check

EDIT : And, China is in comms with Yutu, it is now back on 8462.072MHz with data, and uplink EME is being detected on 7202.377MHz - a huge signal!
« Last Edit: 03/13/2014 09:04 PM by Svetoslav »

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 893
  • Bulgaria
  • Liked: 284
  • Likes Given: 38
So, to sum it up:

https://twitter.com/uhf_satcom

The Yutu rover appears alive and responding to radiosignals.

However, the signal is weaker than before. Thus, we're not sure about its health status.

Offline Lsquirrel

  • Member
  • Posts: 83
  • Liked: 27
  • Likes Given: 3
According to @UHF_Satcom:
China's Yutu rover seems to be back in full chat mode
good signals now, signal levels returned to pre-sleep ones.

Offline jumpjack

  • Full Member
  • **
  • Posts: 245
  • rome-italy
  • Liked: 1
  • Likes Given: 0
Now it's time for new pictures then, come on Yutu! :-)
-- Jumpjack --

Offline plutogno

  • Full Member
  • ****
  • Posts: 717
  • Toulouse, France and Milan, Italy
  • Liked: 113
  • Likes Given: 6
if I understand the google translation of this http://www.sastind.gov.cn/n112/n117/c303631/content.html correctly, CE-3 and Yutu received a software update and were commanded to reboot. is this correct?

Offline MadCow

  • Member
  • Posts: 14
  • Oxford, UK
  • Liked: 0
  • Likes Given: 0
if I understand the google translation of this http://www.sastind.gov.cn/n112/n117/c303631/content.html correctly, CE-3 and Yutu received a software update and were commanded to reboot. is this correct?
No, it's not correct unfortunately. No software update was mentioned in that report.

Offline plutogno

  • Full Member
  • ****
  • Posts: 717
  • Toulouse, France and Milan, Italy
  • Liked: 113
  • Likes Given: 6
thanks. so what does the release say?

Online Galactic Penguin SST

thanks. so what does the release say?

Basically it says that the instruments on the lander and rover are working nominally since they have woken up (07:21 UTC March 12 for the lander and 22:42 UTC March 13 for the rover).
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Online Blackstar

  • Veteran
  • Senior Member
  • *****
  • Posts: 10824
  • Liked: 2335
  • Likes Given: 1
LADEE observations of Chang'e-3 landing.

Offline Robert Thompson

  • Full Member
  • ****
  • Posts: 1117
  • Liked: 82
  • Likes Given: 658
{So now I'm wondering about how, in a lunar polar water architecture (although I get the appeal of mass driving a high-ISP prop), you could intelligently sinter, or add some coating to, a landing zone, so as to maximize thermalization, and retain, if not actively recover, as much water as possible. Recovery would probably only happen on timescales of volatile hopping. Kinda eco.}

Tags: