Author Topic: Chang‘e-4 communications relay satellite - CZ-4C - XSLC - May 21, 2018  (Read 4948 times)

Offline beidou

  • Full Member
  • ****
  • Posts: 747
  • Mars
  • Liked: 40
  • Likes Given: 2
The Chang'e 4 relay spacecraft is planned for launch in June 2018. It will travel to the Earth-Moon L2 point to enable communications with a farside lander to be launched later the same year.

It will be launched by a CZ-4C rocket.
« Last Edit: 04/10/2018 08:38 PM by Satori »

Offline plutogno

  • Full Member
  • ****
  • Posts: 750
  • Toulouse, France and Milan, Italy
  • Liked: 116
  • Likes Given: 6
from Chinaspaceflight on Twitter

Offline Phil Stooke

  • Full Member
  • ***
  • Posts: 398
  • Canada
  • Liked: 236
  • Likes Given: 0
https://www.chinaspaceflight.com/satellite/HIT/DSLWP-A1-A2.html

Looks like the relay satellite will be accompanied by two small satellites, doing a combination of radio astronomy and amateur radio outreach work - enthusiasts can download telemetry and images.  The relay satellite is at L2  but these are apparently in an elliptical lunar orbit.

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 14877
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 4269
  • Likes Given: 579
I think the whole article is worth repeating here.

"DSLWP-A1/A2 Updated: 15 Nov 2016 

Supporting Organisation Harbin Institute of Technology 

Headline Details:

DSLWP is a lunar formation flying mission for low frequency radio astronomy, amateur radio and education, consists of 2 microsatellites. The amateur radio station onboard DSLWP-A1 will provide telecommand uplink and telemetry / digital image downlink. An open telecommand is also designed to allow amateurs to send commands to take and download an image.

They have a volume of about 50x50x40 cm3 and a mass of about 45 kg.

2 linear polarization antennas are mounted along and normal to the flight direction. The satellites are 3-axis stabilized. Proposing A1 downlinks on 435.425 MHz and 436.425 MHz and A2 downlinks on 435.400 MHz and 436.400 MHz using 10K0F1DCN or 10K0F1DEN with 250 bps GMSK with concatenated codes or JT65B.

Planning a launch into a 200 x 9000km lunar orbit in June 2018.

Further info at http://lilacsat.hit.edu.cn/ "
« Last Edit: 12/06/2016 03:00 AM by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online FutureSpaceTourist

  • Senior Member
  • *****
  • Posts: 5682
  • UK
    • Plan 28
  • Liked: 4965
  • Likes Given: 1390
Interesting:

Quote
CGWIC‏ @CGWIC

China and Saudi Arabia to cooperate on lunar explore. MOU for Chang E-4 lunar mission was signed between CNSA and KACST on 16 Mar.

https://twitter.com/CGWIC/status/842704588327342085

Offline Star One

  • Senior Member
  • *****
  • Posts: 8937
  • UK
  • Liked: 1518
  • Likes Given: 168
New overview of this mission from UT in relation to its upcoming launch later this year.

https://www.universetoday.com/138197/upcoming-chinese-lander-will-carry-insects-plants-surface-moon/

Offline Skyrocket

  • Extreme Veteran
  • Senior Member
  • *****
  • Posts: 2129
  • Frankfurt am Main, Germany
  • Liked: 305
  • Likes Given: 79
New overview of this mission from UT in relation to its upcoming launch later this year.

https://www.universetoday.com/138197/upcoming-chinese-lander-will-carry-insects-plants-surface-moon/

This article tells about "a relay orbiter being launched aboard a Long March 5 rocket in June of 2018." The "Long March 5" part is apparently a mistake.

Online Phillip Clark

  • Senior Member
  • *****
  • Posts: 2207
  • Hastings, England
  • Liked: 324
  • Likes Given: 798
New overview of this mission from UT in relation to its upcoming launch later this year.
https://www.universetoday.com/138197/upcoming-chinese-lander-will-carry-insects-plants-surface-moon/
This article tells about "a relay orbiter being launched aboard a Long March 5 rocket in June of 2018." The "Long March 5" part is apparently a mistake.

It is this kind of stupid mistake that makes me doubt anything in the article that I cannot confirm from Chinese sources.
I've always been crazy but it's kept me from going insane - WJ.

Offline Star One

  • Senior Member
  • *****
  • Posts: 8937
  • UK
  • Liked: 1518
  • Likes Given: 168
New overview of this mission from UT in relation to its upcoming launch later this year.
https://www.universetoday.com/138197/upcoming-chinese-lander-will-carry-insects-plants-surface-moon/
This article tells about "a relay orbiter being launched aboard a Long March 5 rocket in June of 2018." The "Long March 5" part is apparently a mistake.

It is this kind of stupid mistake that makes me doubt anything in the article that I cannot confirm from Chinese sources.

It appears to be quoting from at least one Chinese source as it has a link to it within the text.

Offline Phil Stooke

  • Full Member
  • ***
  • Posts: 398
  • Canada
  • Liked: 236
  • Likes Given: 0
The Long March 5 mistake (probably just a typo by a clumsy journalist) doesn't come from that Chinese source, though. 

Offline Star One

  • Senior Member
  • *****
  • Posts: 8937
  • UK
  • Liked: 1518
  • Likes Given: 168
The Long March 5 mistake (probably just a typo by a clumsy journalist) doesn't come from that Chinese source, though.

I know I was just pointing out that at least some of the contents of the article appear to be sourced from Chinese publications.
« Last Edit: 01/06/2018 06:19 PM by Star One »

Offline beidou

  • Full Member
  • ****
  • Posts: 747
  • Mars
  • Liked: 40
  • Likes Given: 2
According to information disclosed here, the launch vehicle will be CZ-3B.

Quote
预计今年年底,“嫦娥四号”探测器将搭乘长三乙火箭飞天

Online Phillip Clark

  • Senior Member
  • *****
  • Posts: 2207
  • Hastings, England
  • Liked: 324
  • Likes Given: 798
According to information disclosed here, the launch vehicle will be CZ-3B.
Quote
预计今年年底,“嫦娥四号”探测器将搭乘长三乙火箭飞天

Perhaps the lunar relay satellite launch is being confused with the launch vehicle for the CE4 mission itself?

The relay satellite is quite light, so it would fit with a CZ-4C launch.
I've always been crazy but it's kept me from going insane - WJ.

Offline Galactic Penguin SST

According to information disclosed here, the launch vehicle will be CZ-3B.
Quote
预计今年年底,“嫦娥四号”探测器将搭乘长三乙火箭飞天

Perhaps the lunar relay satellite launch is being confused with the launch vehicle for the CE4 mission itself?

The relay satellite is quite light, so it would fit with a CZ-4C launch.

I believe that part refers to the lander itself.
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline Galactic Penguin SST

Meanwhile according to this source CZ-4C s/n Y27 will become the first CZ-4 series to fly from Xichang (*) and early co-ordination works are already underway ahead of shipping. This is probably the one rocket that will launch the orbiter.

Also some old news from two weeks ago: the Chang'e 4 orbiter is launching in May 2018: http://cnews.chinadaily.com.cn/2018-01/08/content_35456298.htm

(*) Of course, the origin of the Long March 4 series was the "conventional option" of China's first geosynchronous orbit launcher, only to be beaten out by the Long March 3 because the Chinese wanted to experiment with liquid hydrogen powered rockets!
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Offline zubenelgenubi

  • Full Member
  • ****
  • Posts: 1400
  • Arc to Arcturus, then Spike to Spica
  • Commonwealth of Virginia
  • Liked: 345
  • Likes Given: 941
When is the monthly lunar launch window for this mission?
Support your local planetarium!

Offline satwatcher

  • Full Member
  • *
  • Posts: 125
  • Liked: 82
  • Likes Given: 84
Scientists working on one of the scientific instruments flying with the satellite report launch on May 21st.

Offline Phil Stooke

  • Full Member
  • ***
  • Posts: 398
  • Canada
  • Liked: 236
  • Likes Given: 0
Suggest a name for the relay satellite:

http://www.nssc.cas.cn/tzgg2015/tzgg_tzgg/201803/t20180329_4987980.html

(Google translation)

Concerning the notification of the recruitment of the No. 4 relay star name
Article Source:  Release Time:2018-03-29
All relevant units:

  The fourth relay satellite will be launched in May 2018. Considering that the No. 4 mission will be the biggest bright spot in

China's aerospace field in 2018, to further establish a good image of the lunar exploration project and expand the influence of

the project, the Lunar Exploration and Space Engineering Center plans to use the project implementation unit as the main target

for solicitation of No. 4 Relay star name.

  The No. 4 relay star name collection activity will take place from March 27 to April 15, 2018. The names so collected should

reflect the theme of lunar exploration, have innovative and significant technological and cultural characteristics, be positive,

and conform to the socialist core values.

  Specially invited your organization to participate in this solicitation. Please refer to the attachment for specific

requirements.

  Attachment: Program for Selection of Relay No. 4 Relay Stars

  Moon Exploration and Aerospace Engineering Center

  March 27, 2018

Offline Liss

  • Full Member
  • ****
  • Posts: 982
  • Moscow, Russia
  • Liked: 158
  • Likes Given: 8
Throughout the text, "the fourth relay satellite" and similar expressions should be "Chang'e 4 relay satellite".
This message reflects my personal opinion based on open sources of information.

Offline Phil Stooke

  • Full Member
  • ***
  • Posts: 398
  • Canada
  • Liked: 236
  • Likes Given: 0

http://news.cnstock.com/news,bwkx-201804-4214240.htm

China Securities News reported on April 24 from the National Bureau of Science, Technology, and Technology that during the opening ceremony of the "China Aerospace Day" home event in 2018, Wu Yanhua said that the Chang'e 4 is one of the major tasks for China's space industry this year...

Wu Yanhua announced at the opening ceremony that the No. 4 relay star was named "Bianqiao" and the two small satellites were named "Longjiang No. 1" and "Longjiang No. 2".

Tags: