Page 2 of 3 FirstFirst 123 LastLast
Results 31 to 60 of 63

Thread: China's Chang'e 4 mission

  1. #31
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    An article from The Planetary Society written before the lunch gives more information of the mission.

    http://www.planetary.org/blogs/guest...satellite.html

    China's fourth lunar mission, Chang’e 4, is expected to begin on May 21 with the launch of a Long March 4C rocket from the Xichang Satellite Launch Centre in the southwest of China. The launch will carry a spacecraft named Queqiao, which will serve as a communication relay satellite between Earth and the lunar farside. The name Queqiao means "magpie bridge" in Chinese and comes from a Chinese folk tale, a love story about a flock of magpies that form a bridge crossing the Milky Way once a year to reunite lovers known as the Cowherd and the Weaver Girl, as well as their children.

  2. #32
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    The Chinese paper Xinhua has a short video of the launch and more details of the mission.

    http://www.xinhuanet.com/english/201..._137194788.htm

    China launched a relay satellite early Monday to set up a communication link between Earth and the planned Chang'e-4 lunar probe that will explore the Moon's mysterious far side.

    The satellite was carried by a Long March-4C rocket that blasted off at 5:28 a.m. from southwest China's Xichang Satellite Launch Center, according to the China National Space Administration (CNSA).

  3. #33
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Queqiao will be passing the moon today.

    https://gbtimes.com/queqiao-update-t...ay-to-the-moon

    According to data computed by Bill Gray, an independent orbit analyst, Queqiao was close to 333,000 kilometres away from Earth at time of publishing on May 23 (with the average Earth-Moon distance being 384,400 km).

    Queqiao is expected to reach and swing-by the Moon on May 25, before heading to its destination, the second Earth-Moon Lagrange point.

    Gray told gbtimes that Queqiao will need to perform a manoeuvre to slow its speed as it comes close to the Moon in order to send it towards its intended destination. If not, Queqiao will leave the Moon with as much energy as when it arrived, and go back into orbit around the Earth.

    "We now have Queqiao going past the moon at 110 +/- 54 km at 13:41 UT on 25 May. That's based just on tracking it optically, though, with no knowledge of when it might manoeuvre," Gray said.

    The expected manoeuvre is the next key moment in the Chang'e-4 mission, which ultimately aims to help operate a lander and rover on the lunar far side.

  4. #34
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Queqiao Chang'e-4 relay satellite has successfully done the breaking as it passed the moon to reach L2.

    https://gbtimes.com/queqiao-change-4...-space-program

    The Queqiao Chang'e-4 relay satellite has passed the Moon and successfully performed a propulsive manoeuvre to slow itself and send it towards its intended destination beyond the Moon.

    The Beijing Aerospace Control Centre (BACC) issued the command at 21:32 Beijing time (13:32 UTC), and by 21:46 confirmed through telemetry that Queqiao had performed the burn and entered a transfer orbit towards the second Earth-Moon Lagrange point, People's Liberation Army Daily reported.

    The spacecraft passed the Moon at 100 km above the surface at closest approach. Failure to perform the braking manoeuvre would have seen the spacecraft head back towards the Earth.

  5. #35
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    China has lost contact with one of the micro satellites but it will have no effect on the Chang'e mission.

    https://gbtimes.com/change-4-lunar-m...-space-program

    Contact has been lost with one of two microsatellites launched along with the Queqiao Chang'e-4 lunar relay satellite following a standard trajectory correction manoeuvre on the way to the Moon.

    DSLWP-A and B, also known as Longjiang-1 and -2, piggybacked on the launch of Queqiao, a relay satellite for a planned landing on the lunar far side, on a Long March 4C rocket from Xichang on May 20.

    Queqiao passed the Moon at an altitude of 100 km on Friday, successfully performing a braking burn to send it towards its intended destination, the second Earth-Moon Lagrange point, from which it will facilitate communications between the Earth and a lander and rover to be sent to the far side of the Moon.

    The Discovering the Sky at Longest Wavelengths Pathfinder (DSLWP) satellites were intended to execute burns to place them in an elliptical (200 x 9,000 km) orbit around the Moon, where they would carry out astronomy and amateur radio tests.

    While DSLWP-B/Longjiang-2 successfully entered lunar orbit, there has been apparently no communication between the ground and Longjiang-1 following a trajectory correction manoeuvre after trans-lunar injection.

  6. #36
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Some updates on the Queqiao mission. Do not expect any official update from the Chinese government till mid month when the Queqiao satellite will have settled in its L2 orbit.

    https://gbtimes.com/queqiao-update-c...-space-program

    It has been a week since the Queqiao Chang'e-4 lunar relay satellite made its lunar swing-by, sending it on a transfer trajectory towards the second Earth-Moon Lagrange Point (EML2). There have been no official updates from China, so where is the spacecraft now?

    Having launched late on May 20 UTC, Queqiao made its lunar swing-by on May 25, performing a braking burn at 13:32 UTC to send the communications satellite towards EML2, some 60-80,000 km beyond the Moon.

    EML2 is one of five libration points in the Earth-Moon system that allow a much smaller third body to orbit while maintaining its position relative to the larger two, making it a perfect place for Queqiao to perform its main objective.

    Queqiao should have approached the EML2 point by May 29 after two orbital corrections, but no updates have come from China. This has brought confusion, but making the distinction between reaching EML2 and establishing the desired orbit around it helps bring clarity.

  7. #37
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Spaceflightnow carries information on Queqiao and Chang'e 4.

    https://spaceflightnow.com/2018/06/0...e-of-the-moon/

    A Chinese communications satellite carrying a Dutch radio astronomy instrument launched last month is expected to maneuver into position around a gravitationally-stable point beyond the moon in the coming days, ready to relay telemetry and data between Earth and the Chang’e 4 lander set to attempt the first landing on lunar far side late this year.

    Launched at 2128 GMT (5:28 p.m. EDT) May 20 from China’s Xinhua space center aboard a Long March 4C rocket, the relay probe completed an engine firing as it flew around 60 miles (100 kilometers) from the moon May 25, setting a course for a perch around 280,000 miles (450,000 kilometers) from Earth.

    The relay craft is named Queqiao, which means “magpie bridge” and comes from a Chinese folk tale in which a flock of birds form a bridge across the galaxy to reunite two lovers.

    Queqiao will park itself in a “halo” orbit around the Earth-moon L2 Lagrange point around 37,000 miles (60,000 kilometers) beyond the moon. At that location, the combined effect from gravity from Earth and the moon will keep Queqiao at roughly the same distance as the moon completes each 28-day orbit.

    China developed the Queqiao spacecraft, which weighed roughly 900 pounds (400 kilograms) fully fueled for launch, to link ground controllers and scientists with the Chang’e 4 lander and rover, the country’s next robotic mission to the moon.

  8. #38
    Join Date
    Jul 2006
    Posts
    12,235
    Is this going to be a rover mission?
    Time wasted having fun is not time wasted - Lennon
    (John, not the other one.)

  9. #39
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Quote Originally Posted by BigDon View Post
    Is this going to be a rover mission?
    Yes to be launched towards the end of the year.

  10. #40
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    spacenews confirme Queqiao has entered its intended orbit around L2. Also one of the micro satellites has been successfully put into luna orbit but the other one has been lost.

    http://spacenews.com/change-4-relay-...n-lunar-orbit/

    The relay satellite which will facilitate China’s Chang’e-4 lunar far side landing mission late in 2018 has entered its intended halo orbit around Earth-Moon Lagrange point 2.

    The Beijing Aerospace Command and Control Center (BACC) sent commands for the spacecraft to fire its engines at 11:00 p.m. EDT June 13, with the burn complete at 11:06 p.m.

    The satellite will now undergo on-orbit testing of its communications functions, while maintaining a complex Lissajous orbit, which is a three-dimensional irregular curve, rather than a two-dimensional halo.

  11. #41
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    China and Saudi Arabia jointly released photos of the moon.

    http://www.xinhuanet.com/english/201..._137253874.htm

    China and Saudi Arabia on Thursday jointly unveiled three lunar images acquired through cooperation on the relay satellite mission for Chang'e-4 lunar probe.

    This is an important cooperation achievement between China and Saudi Arabia in the relay satellite mission, the China National Space Administration said in a statement.

  12. #42
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    "How China's lunar relay satellite arrived in its final orbit".

    http://www.planetary.org/blogs/guest...explainer.html

    After a 24-day journey, Queqiao, the relay satellite for China's Chang'e 4 lunar mission, successfully entered its Earth-Moon L2 halo orbit. A normal mission to lunar orbit usually takes four or five days, but Queqiao took much longer due to its special orbit. Here's a guide to the spacecraft's long and complicated journey.

  13. #43
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    China just released photos of Chang'e 4 rover

    http://www.xinhuanet.com/english/201..._137393174.htm

    "China's moon lander and rover for the Chang'e-4 lunar probe, which is expected to land on the far side of the moon this year, was unveiled Wednesday.

    Images displayed at Wednesday's press conference showed the rover was a rectangular box with two foldable solar panels and six wheels. It is 1.5 meters long, 1 meter wide and 1.1 meters high."

    Sent from my SM-G900F using Tapatalk
    I am because we are
    (African saying)

  14. #44
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Chang'e 4 all set for December launch.

    http://www.planetary.org/blogs/guest...announced.html

    China is all set to attempt the first ever soft-landing on the far side of the Moon, announcing on Wednesday that it will launch the Chang’e-4 lunar lander and rover spacecraft in December.

    Renders of the lander and rover were unveiled at a press conference in Beijing, along with a contest (Chinese) to name what will be China’s second lunar rover, and a video preview of the mission.

  15. #45
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    "A tiny Chinese satellite is orbiting the Moon and allowing radio amateurs to download images"

    https://gbtimes.com/a-tiny-chinese-s...ownload-images

    China's Chang'e-4 lander and rover are scheduled to launch in December this year to perform the first ever soft-landing on the far side of the Moon, but the mission's side quests are already performing impressive feats.

    One of two microsatellites launched along with a required communications relay satellite in May has quietly been allowing radio operators to download images from the spacecraft taken along its elliptical lunar orbit.

    Longjiang-2, aka DSLWP-B, was developed by students at the Harbin Institute of Technology (HIT) in Heilongjiang Province, northeast China. Despite having a mass of just 47 kg, the tiny satellite managed to use its own propulsion to slow down and enter lunar orbit while the relay satellite continued past the Moon to its special destination.
    I am because we are
    (African saying)

  16. #46
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    The naming of the rover being carried by Chang'e 4 has been narrowed down to 10 candidates. The Chinese public will have till October 10 to vote for their name on the list.

    https://gbtimes.com/change-4-shortli...far-side-rover

    A shortlist of ten names has been revealed for the Chang'e-4 lunar far side rover following a public call and contest to solicit names for the pioneering Moon mission.
    I am because we are
    (African saying)

  17. #47
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    "Pre-launch tests at Xichang, rover upgraded, launch and landing predictions"

    https://gbtimes.com/change-4-pre-lau...ng-predictions

    Preparations for the first-ever attempt at a soft landing on the far side of the Moon are progressing at Xichang Satellite Launch Centre in southwestern China.

    Teams are understood to be in Xichang performing pre-launch tests on the Chang'e-4 lander and rover ahead of the mission in December, according to a top scientist with the China Academy of Space Technology (CAST).
    I am because we are
    (African saying)

  18. #48
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Quote Originally Posted by selvaarchi View Post
    "A tiny Chinese satellite is orbiting the Moon and allowing radio amateurs to download images"
    Radio enthusiasts who have been following this mission were rewarded with images captured by the tiny satellite.

    https://gbtimes.com/radio-enthusiast...in-lunar-orbit

    Radio enthusiasts managed to connect with and download images captured by a tiny satellite in lunar orbit over the weekend and were rewarded with images of the Moon and Earth.

    The latest UHF tests saw data transmitted by Longjiang-2 and received and decoded by radio operators on Earth on October 7 and 8.
    I am because we are
    (African saying)

  19. #49
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    We are days away from the launch of Chang'e 4 and already articles on it are being released. Here is one from "Nature".

    https://www.nature.com/articles/d41586-018-07562-z

    Early in the New Year, if all goes well, the Chinese spacecraft Chang’e-4 will arrive where no craft has been before: the far side of the Moon. The mission is scheduled to launch from Xichang Satellite Launch Centre in Sichuan province on 8 December. The craft, comprising a lander and a rover, will then enter the Moon’s orbit, before touching down on the surface.

    If the landing is successful, the mission’s main job will be to investigate this side of the lunar surface, which is peppered with many small craters. The lander will also conduct the first radio astronomy experiments from the far side of the Moon — and the first investigations to see whether plants will grow in the low-gravity lunar environment.
    I am because we are
    (African saying)

  20. #50
    Join Date
    Aug 2003
    Posts
    1,871
    Quote Originally Posted by selvaarchi View Post
    We are days away from the launch of Chang'e 4 and already articles on it are being released. Here is one from "Nature".

    https://www.nature.com/articles/d41586-018-07562-z
    Not exactly the first to reach the far side. Ranger 4, with its beeping seismograph encased in balsa wood, was tracked to an impact on the far side at 15.5s 130.7w, on April 26, 1962.

  21. #51
    Join Date
    Jul 2014
    Posts
    10
    China to launch Chang'e-4 lunar far side landing mission on December 7 (~18:20 UTC/13:20 ET on Friday; 02:20 Beijing time Saturday).

    https://gbtimes.com/china-to-launch-...-on-december-7

  22. #52
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Confirmed - launch is on December 7th.

    https://gbtimes.com/china-to-launch-...-on-december-7

    China will launch its Chang'e-4 lunar mission on December 7 universal time which will see a lander and rover spacecraft make the first ever attempt to land on the far side of the Moon.

    According to airspace closure notices issued on Wednesday, the launch will take place between 18:15-18:34 universal time (13:15-13:34 Eastern) on Friday (02:15-02:34 Beijing time Saturday).

    The Chang'e-4 lander and rover will launch atop an enhanced Long March 3B carrier rocket from the Xichang Satellite Launch Centre in southwest China.

    There is currently no indication that the launch will be broadcast live, in which case the first official news after liftoff may only be provided once the spacecraft have successfully entered lunar transfer orbit.
    I am because we are
    (African saying)

  23. #53
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    It is on the way to the moon

    https://spaceflightnow.com/2018/12/0...e-of-the-moon/

    A robotic lander and rover lifted off Friday (U.S. time) from China’s Xichang space center, kicking off a journey through space that will culminate in an attempt in early January to touch down on the far side of the moon for the first time.

    The Chang’e 4 mission — the fourth in China’s main line of lunar explorers — lifted off at around 1823 GMT (1:23 p.m. EST) Friday from Xichang, an inland spaceport nestled between hills in southwestern China’s Sichuan province.

    Chang’e 4 climbed into the night sky at Xichang — liftoff occurred at 2:23 a.m. Beijing time Saturday — toward the east affixed to the top of a Long March 3B rocket.

    Chinese state television did not broadcast the launch live, as it did for China’s previous lunar mission launch in 2013, but spectators near Xichang streamed live video of the middle-of-the-night blastoff online without commentary. The video showed the Long March 3B disappearing into the night sky a few minutes after an apparently smooth liftoff from Xichang.
    I am because we are
    (African saying)

  24. #54
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    Emily Lakdawalla on the lift off and how to follow on the progress of Chang'e 4 on Twitter (by Planetary Society staff).

    http://www.planetary.org/blogs/emily...-change-4.html

    The spacecraft has now performed its trans-lunar injection rocket burn, aiming toward the Moon. According to Quanzhi Ye, there are rocket maneuvers planned for 8, 9, and 10 December (UTC), and orbit insertion is planned for about 15:00 on 11 December.

    It will be 26 days until the spacecraft lands on the lunar farside, on or about 3 January. We'll post further news as we get it! In the meantime, follow me, Andrew Jones, and Jonathan McDowell on Twitter, and read our Planetary Report article about Chang'e-4 by mission scientist Long Xiao.
    I am because we are
    (African saying)

  25. #55
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    A 2 and a half minute video on the preparations for the Chang'e 4 mission (it is in Mandarin). It includes a bit of information I was not aware of before. Chang'e 4 can operate at night!

    http://www.cctvplus.com/archive/2018...ml#!language=1

    "There are some differences between Chang'e-3 and Chang'e-4. The Chang'e-3 landed on the moon following a parabolic path, but our Chang'e-4 will primary land vertically," said Sun.

    With no access to the solar energy, the Chang'e-3 probe was totally power off in the nights on the moon, and all electronic equipment stopped work. But Chang'e-4 is equipped with a heating supply system, aimed to power the equipment.

    "Based on the supply of heat energy, we also try to use thermoelectric effect to generate power for the electronic equipment," said Sun.
    I am because we are
    (African saying)

  26. #56
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    China has done the second orbital correction.

    http://www.cctvplus.com/archive/2018...ml#!language=1

    The second orbit trimming for China's Chang'e-4 lunar probe was completed on Sunday afternoon at Kashgar Observation and Control Station in northwest China's Xinjiang Uygur Autonomous Region.
    I am because we are
    (African saying)

  27. #57
    Join Date
    Oct 2001
    Location
    The Space Coast
    Posts
    4,332
    How do the lander and rover plan to communicate with Earth? Is there a relay satellite already in orbit?

    CJSF
    "Find a way to show what would happen
    If you were incorrect
    A fact is just a fantasy
    Unless it can be checked
    Make a test
    Test it out"
    -They Might Be Giants, "Put It To The Test"


    lonelybirder.org

  28. #58
    Join Date
    Jul 2012
    Posts
    270
    Quote Originally Posted by CJSF View Post
    How do the lander and rover plan to communicate with Earth? Is there a relay satellite already in orbit?

    CJSF
    Yup, relay satellite is at the far side Lagrange point, L2.

  29. #59
    Join Date
    Oct 2001
    Location
    The Space Coast
    Posts
    4,332
    I must have missed when that launched. Cool!

    CJSF
    "Find a way to show what would happen
    If you were incorrect
    A fact is just a fantasy
    Unless it can be checked
    Make a test
    Test it out"
    -They Might Be Giants, "Put It To The Test"


    lonelybirder.org

  30. #60
    Join Date
    Jan 2014
    Location
    Klang, Malaysia
    Posts
    6,818
    It was reported here in post#30.
    I am because we are
    (African saying)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •