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Chang'e-4 farside landing mission
A.Nemo
post Jul 15 2015, 01:35 PM
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Preliminary Suggestions for International Cooperation on Chang'E-4 Lunar Probe
Xu Y. (China)
http://www.unoosa.org/pdf/pres/copuos2015/...2015tech08E.pdf

An Introduction of Chang’E-4 Probe:
Probe(Lander,Rover)+ Relay Statellite
Soft-landing on lunar farside
Landing and roving exploration
Will be launched between 2018 and 2019

the probe:
Chang’E-4 probe,lander and rover have the same technical status with the Chang’E -3; but exploration will be redesigned; the payload will be reconfigered; The name of the probe might be changed.
Chang’E-4 probe is a backup spacecraft of Chang’E -3 probe. By now, all platform products of the probe have been manufactured, waiting for further AIT.
The probe will be launched by a long March 3B rocket from the Xichang Statellite Launch Center(XSLC) which is the same way with the Chang'E-3 between 2018 and 2019

The relay statellite:
will be first launched into a lunar transfer orbit about the end of 2018 in the whole mission, then starts its earth-to-moon jurnery alone, and will enter and run in a Halo orbit around the Earth-Moon L2 point; the design life is 3 years.
would provide relay service for the probe and the Earth, and carry out exploration.

Engineering objectives are as follow.
To realize the first soft landing on the lunar farside and perform exploration in human history.
To demonstrate technologies of lunar data relay, landing and roving on complicated terrains of the lunar farside, and lunar night power generation;
To perform further detailed survey on lunar environment in order to lay a foundation for subsequent lunar exploration mission.

Tentative Scientific objectives are as follow.
To study lunar surface dust features and its formation mechanism;
To perform in-situ measurement of lunar surface residual magnetism
and study its interaction with solar wind;
To study lunar surface temperature and particle radiation environment;
To perform lunar surface topology and material composition analysis,
shallow-layer structure survey and study;
To explore and study lunar interior structure of spheres;
To perform lunar based VLF astronomical observation and study
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Phil Stooke
post Dec 18 2018, 09:06 PM
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The moon rotates under that orbit plane, the landing site passes through the orbit plane twice a month, and no change in the orbit is needed for the landing site to be in the right place at the appropriate time.

China is not saying much, but assuming the spacecraft is healthy I can't see any cause for concern.

Phil

* Also there was no sudden change in the CE3 landing site. The landing area was called 'the Sinus Iridum landing area' but it extended well outside of Sinus Iridum. CE3 landed at its eastern end, which makes sense because if you target that and a technical problem causes a delay of a few orbits, you just land further west in the landing area (as the Moon rotates under the orbit plane). If you target the landing in central Sinus Iridum and have to delay, you risk the landing site slipping into mountainous terrain.


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Posts in this topic
- A.Nemo   Chang'e-4 farside landing mission   Jul 15 2015, 01:35 PM
- - A.Nemo   there is a puzzle news: http://www.cnsa.gov.cn/n10...   Jul 15 2015, 01:43 PM
|- - bobik   QUOTE (A.Nemo @ Jul 15 2015, 02:43 PM) th...   Jan 6 2016, 12:55 PM
|- - Thorsten Denk   It seems that Cháng'é 4 will go to the lunar f...   Jan 14 2016, 01:39 PM
- - Juramike   (Edited!)   Jul 15 2015, 01:49 PM
- - Phil Stooke   The current Chinese plan is to land on the far sid...   Jul 15 2015, 03:52 PM
- - Yeh   Today there's an official confirmation from Xi...   Sep 8 2015, 01:38 PM
|- - tolis   QUOTE (Yeh @ Sep 8 2015, 02:38 PM) Today ...   Sep 9 2015, 01:46 PM
- - Phil Stooke   It's at L2. More details here: http://forum....   Sep 9 2015, 01:54 PM
- - bobik   German "Lunar Lander Neutron Dosimetry" ...   Apr 14 2016, 06:01 PM
- - A.Nemo   China Follow-on Luna Exploration Projects: 2018,Ch...   Apr 15 2016, 08:19 AM
- - bobik   A joint Dutch and Chinese low frequency receiver i...   May 17 2016, 06:45 AM
- - Phil Stooke   http://www.chinaspaceflight.com/satellite/.../CE-4...   Jun 3 2016, 02:58 PM
- - Phil Stooke   A fascinating new paper is now online - Wang and L...   Jun 20 2016, 11:14 AM
- - Explorer1   http://spaceflightnow.com/2016/09/29/china...de-of...   Oct 2 2016, 05:11 PM
- - Phil Stooke   Chang'E 4 landing site: https://www.chinasp...   Jun 6 2017, 04:15 PM
- - Phil Stooke   Here's a couple of maps showing the CE4 area. ...   Jun 11 2017, 08:24 PM
- - antipode   Phil I take it Von Karman's walls are suffici...   Jun 12 2017, 04:37 AM
- - Explorer1   I wouldn't be so sure; the horizon is really c...   Jun 12 2017, 05:35 AM
|- - JRehling   Probably everyone knows this, but on the Moon, the...   Jul 7 2017, 01:32 AM
- - Phil Stooke   Short answer - I think some relief will be visible...   Jun 12 2017, 05:16 PM
- - Phil Stooke   More information on site selection for CE4. This ...   Jul 6 2017, 06:01 PM
- - Phil Stooke   Here is a map of those sites from the slide linked...   Jul 7 2017, 12:22 AM
- - Phil Stooke   That's true, of course, but the distance to th...   Jul 7 2017, 06:00 PM
- - Phil Stooke   The Von Karman site may not be the final word on s...   Feb 27 2018, 07:49 PM
- - Phil Stooke   I'm at the Microsymposium just prior to LPSC. ...   Mar 18 2018, 06:09 PM
- - Phil Stooke   Suggest a name for the CE4 relay satellite: http:...   Apr 11 2018, 05:10 PM
- - Phil Stooke   This link is to the current issue of China's J...   Apr 22 2018, 06:20 PM
- - Phil Stooke   After a suitable gestation period, here is a map o...   Apr 23 2018, 11:48 PM
- - Phil Stooke   http://news.cnstock.com/news,bwkx-201804-4214240.h...   Apr 24 2018, 02:38 AM
- - Phil Stooke   Interesting that Google translates that website to...   Apr 24 2018, 09:39 PM
- - Phil Stooke   The relay satellite was just launched successfully...   May 20 2018, 10:08 PM
- - nprev   Ah, thanks, Phil! Was wondering; didn't se...   May 20 2018, 10:23 PM
- - Explorer1   Someone at the site pointed their phone at a scree...   May 20 2018, 10:29 PM
- - John Moore   Video 1 of launch, or Video 2 (with different aspe...   May 21 2018, 09:30 AM
- - Phil Stooke   It seems all is well with our new mission - the re...   May 25 2018, 10:40 PM
- - Phil Stooke   Twitter: Jonathan McDowell @planet4589 2 hou...   May 27 2018, 09:56 PM
- - mcmcmc   "Are we there yet?"   Jun 13 2018, 07:30 AM
- - Phil Stooke   We are! http://spacenews.com/change-4-relay-s...   Jun 14 2018, 04:16 PM
|- - mcmcmc   QUOTE (Phil Stooke @ Jun 14 2018, 05:16 P...   Jun 14 2018, 05:49 PM
|- - Thorsten Denk   Nice pic, but it's not new. It's from Chan...   Jun 14 2018, 07:00 PM
- - mcmcmc   Hayabusa twitter aggregator http://win98.altervist...   Jun 14 2018, 06:53 PM
- - John Moore   Andrew Jones's observations are always useful ...   Jun 14 2018, 07:13 PM
- - mcmcmc   Better images from Saudi Arabia camera onboard Lon...   Jun 15 2018, 06:51 AM
- - Phil Stooke   Andrew Jones (https://twitter.com/AJ_FI) reports s...   Aug 6 2018, 10:48 AM
- - djellison   I think those are just symptoms of SSTV ham radio ...   Aug 6 2018, 04:10 PM
- - Phil Stooke   Yes, looking at it now I'm inclined to agree. ...   Aug 6 2018, 09:59 PM
- - Phil Stooke   http://www.spaceflightfans.cn/39192.html#more-3919...   Sep 19 2018, 06:47 PM
- - Explorer1   Golden rabbit sounds really fun! It has my vot...   Sep 19 2018, 06:55 PM
- - Phil Stooke   Phil   Sep 19 2018, 11:56 PM
- - Xerxes   My Chinese is just ok, but I would translate them ...   Sep 20 2018, 02:34 PM
- - Phil Stooke   Thanks! And now Andrew Jones has these meanin...   Sep 20 2018, 05:35 PM
- - Phil Stooke   http://lilacsat.hit.edu.cn/dashboard/pages_en/pics...   Nov 9 2018, 10:30 PM
|- - mcmcmc   QUOTE (Phil Stooke @ Nov 9 2018, 11:30 PM...   Nov 9 2018, 11:19 PM
- - Phil Stooke   Here's another with a few missing lines. Th...   Nov 10 2018, 06:00 AM
- - mcmcmc   I wonder what this sat will see while Chang'e4...   Nov 10 2018, 10:50 AM
- - Phil Stooke   Check out this excellent blog by Daniel Estevez: ...   Nov 18 2018, 08:34 PM
- - Phil Stooke   And a mosaic of two recent images (Mare Humboldtia...   Nov 18 2018, 08:45 PM
- - Phil Stooke   Chang'e 4 launch set for tomorrow. We still d...   Dec 6 2018, 07:04 PM
- - nogal   It seems that the name was to be decided by an on-...   Dec 7 2018, 05:08 PM
|- - Thorsten Denk   It seems that the Cháng'é-4 launch has been su...   Dec 7 2018, 07:37 PM
- - kenny   This is fullest info I found , albeit no updates s...   Dec 8 2018, 11:50 AM
- - Phil Stooke   https://www.projectpluto.com/pluto/mpecs/18103b.ht...   Dec 10 2018, 06:10 PM
- - kenny   Video showing the preparation of Chang'e-4 and...   Dec 10 2018, 08:00 PM
- - Hungry4info   Chang'e 4 is now in lunar orbit. http://www.ch...   Dec 12 2018, 11:43 AM
- - nprev   Good article from The Planetary Society on this mi...   Dec 12 2018, 06:20 PM
- - Steve G   I'm amazed by the size of their mission contro...   Dec 13 2018, 12:23 PM
|- - MahFL   QUOTE (Steve G @ Dec 13 2018, 12:23 PM) I...   Dec 14 2018, 12:28 AM
- - Phil Stooke   A bit of concern here - let's hope all is well...   Dec 13 2018, 08:25 PM
|- - Hungry4info   QUOTE (Phil Stooke @ Dec 13 2018, 03:25 P...   Dec 14 2018, 03:41 AM
- - kenny   According to this news story from Dec 17, the Chan...   Dec 18 2018, 06:04 PM
- - Explorer1   From the amateur radio listener's post, it app...   Dec 18 2018, 06:41 PM
- - Phil Stooke   The moon rotates under that orbit plane, the landi...   Dec 18 2018, 09:06 PM
|- - JTN   gbtimes reports "Chang'e-4 has had severa...   Dec 20 2018, 08:51 PM
- - Explorer1   Thanks for the explanation Phil...I should have th...   Dec 20 2018, 09:13 PM
|- - Thorsten Denk   Hi all! Cháng'é-4 is now in the final 15x...   Dec 30 2018, 06:01 PM
- - Bernard   No disagreement. This looks brilliant to me.   Dec 31 2018, 08:10 AM
- - nprev   Very impressive orbital mechanical detective work,...   Dec 31 2018, 09:14 AM
|- - Thorsten Denk   QUOTE (nprev @ Dec 31 2018, 10:14 AM) Ver...   Jan 2 2019, 06:22 PM
|- - Baywa   QUOTE (Thorsten Denk @ Jan 2 2019, 07:22 ...   Jan 3 2019, 09:16 AM
|- - Thorsten Denk   QUOTE (Baywa @ Jan 3 2019, 10:16 AM) What...   Jan 3 2019, 09:33 AM
|- - Baywa   OK - so I mixed up the OR and the AND operator. ...   Jan 3 2019, 10:25 AM
- - charborob   1- Is there an official Chang'e 4 website? 2- ...   Jan 2 2019, 03:55 PM
|- - nogal   1- Is there an official Chang'e 4 website? I...   Jan 2 2019, 04:46 PM
- - Phil Stooke   What are we about to see? Almost everywhere i loo...   Jan 2 2019, 09:33 PM
- - Explorer1   Unconfirmed social media reports of a successful l...   Jan 3 2019, 02:46 AM
- - Hungry4info   Official Chinese media are reporting successful la...   Jan 3 2019, 04:24 AM
- - charborob   Landing announced on Xinhuanet link   Jan 3 2019, 04:25 AM
- - Hungry4info   RE: Chang'e-4 farside landing mission   Jan 3 2019, 04:59 AM
- - nprev   Remarkable. Congratulations to China!   Jan 3 2019, 05:07 AM
- - Explorer1   First surface image from the far side. A historic ...   Jan 3 2019, 05:08 AM
- - Sym05   Smartphone screenshot of CCTV 13 news cannel. 14:0...   Jan 3 2019, 06:25 AM
- - Phil Stooke   Okey-dokey, here we go. These are the views from ...   Jan 3 2019, 08:06 AM
- - Phil Stooke   One other comment - the hills on the horizon in th...   Jan 3 2019, 08:22 AM
|- - Webscientist   Congratulation to CNSA and the engineers! Su...   Jan 3 2019, 08:59 AM
|- - wildespace   QUOTE (Phil Stooke @ Jan 3 2019, 08:22 AM...   Jan 3 2019, 03:59 PM
- - charborob   Photo of the landing pad on the Moon (link)   Jan 3 2019, 11:03 AM
- - Sym05   From twitter: https://twitter.com/Cosmic_Penguin/...   Jan 3 2019, 01:22 PM
- - Hungry4info   Yutu 2 deployment.   Jan 3 2019, 04:42 PM
- - tolis   QUOTE (Hungry4info @ Jan 3 2019, 04:42 PM...   Jan 3 2019, 05:13 PM
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