Author Topic: Queqiao (Chang‘e-4 coms relay sat) - CZ-4C - XSLC - May 20, 2018 (21:28 UTC)  (Read 32183 times)

Offline beidou

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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: 05/21/2018 09:18 AM by input~2 »

Offline plutogno

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from Chinaspaceflight on Twitter

Online Phil Stooke

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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

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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.

Offline FutureSpaceTourist

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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 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

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When is the monthly lunar launch window for this mission?
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Offline satwatcher

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Scientists working on one of the scientific instruments flying with the satellite report launch on May 21st.

Online Phil Stooke

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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

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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.

Online Phil Stooke

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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".

Offline eeergo


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".

Interestingly, copying the original characters into the translator gives you the translation of "Qučqiáo", which is the name of the mythological "magpie bridge" referenced here https://twitter.com/AJ_FI/status/988648810925576193

I don't know why, when translating the whole article, "Bianqiao" comes up...
-DaviD-

Offline Kosmos2001

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I haven't found a CZ-4C (or CZ-4 in general) mission sending anything so far away. It will be interesting to see the launcher performance.

Offline Satori

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Online Phillip Clark

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I haven't found a CZ-4C (or CZ-4 in general) mission sending anything so far away. It will be interesting to see the launcher performance.

Remember that the original CZ-4A design was for launching satellites to GEO (the CZ-3 won in that design contest), so reducing the payload mass would give a trans-lunar capability.   Also remember that on Chang'E 1 the satellite was originally put into an eccentric Earth orbit and then the satellite used its own propulsion system for additional burns to enter a trans-lunar trajectory.
« Last Edit: 04/24/2018 06:36 PM by Phillip Clark »
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Online Phil Stooke

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That's what I get for relying on Google to translate that article!  Curious that it behaves differently for the name itself, as eeergo says.  Anyway, we now have the names.  I expect we will get a name for the rover later in the year.

Offline zubenelgenubi

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

<snip>

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".

Could someone translate the names, please?
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Offline Satori

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

<snip>

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".

Could someone translate the names, please?

Queqiao or 'magpie bridge' comes from Chinese mythologie.

Longjiang, means Dragon River.

Offline zubenelgenubi

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

<snip>

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".

Could someone translate the names, please?

Queqiao or 'magpie bridge' comes from Chinese mythologie.

Longjiang, means Dragon River.

Oh yes, the bridge formed by all the magpies of the world over the Heavenly River (Milky Way).  They allow the Cowherd (Altair) and the Weaver Girl (Vega) to be together once a year, on the seventh day of the seventh lunar month!

Thank you!
« Last Edit: 04/24/2018 08:23 PM by zubenelgenubi »
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Offline zubenelgenubi

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APStar-6C is successfully launched, and Queqiao is the next launch from Xichang.

4 questions (I realize that some or all of them may not be answerable at this moment):

What tracking ship or ships will support this mission?

Will the launch be video/web-cast live?

What is the launch window time and length?

How many days will the window remain open?
« Last Edit: 05/03/2018 11:27 PM by zubenelgenubi »
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