Цюэцяо – CZ-4C – Сичан (XSLC) – 20.05.2018, 21:28 UTC

[zandr]

http://russian.news.cn/2018-05/06/c_137159182.htm

Китайское судно "Юаньван-6" приступило к выполнению миссии по слежению за спутником-ретранслятором "Цюэцяо" для лунного зонда "Чанъэ-4"  
Нанкин, 6 мая /Синьхуа/ -- Судно мониторинга космических полетов "Юаньван-6" в субботу вышло из порта провинции Цзянсу на востоке Китая и отправилось в заданный район Тихого океана, чтобы следить за полетом "Цюэцяо" - спутника-ретранслятора для лунного зонда "Чанъэ-4".
Лунный зонд "Чанъэ-4" будет запущен в конце нынешнего года, он должен будет совершить первую в истории человечества посадку на обратной стороне Луны. Спутник-ретранслятор "Цюэцяо" будет отвечать за передачу сигнала между Землей и обратной стороной Луны.
Слежение и контроль над "Цюэцяо" с моря будет осуществляться судами "Юаньван-6" и "Юаньван-7". Судно "Юаньван-7" только что завершило миссию по слежению за спутником связи APSTAR-6C и уже отправилось в заданную акваторию для выполнения нового задания.

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Andrew Jones‏ @AJ_FI 5 ч. назад

Yuanwang 6 & Yuanwang 7 space tracking ships are currently heading for locations to support launch of the Chang'e-4 relay satellite, set for May 21. https://gbtimes.com/change-4-yuanwang-6-tracking-vessel-prepares-for-moon-relay-satellite-launch ...

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[Димитър]

Yuanwang 6 & Yuanwang 7 space tracking ships are currently heading for locations 

Не рано ли еще?

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https://gbtimes.com/change-4-yuanwang-6-tracking-vessel-prepares-for-moon-relay-satellite-launch

Chang'e-4: Yuanwang 6 tracking vessel prepares for Moon relay satellite launch
by Andrew Jones | May 07, 2018 15:23 | CHINA ▪ GERMANY ▪ MOON


Relatives of the crew watch as the Yuanwang 6 space tracking vessel leaves port controlled by the China Satellite Launch and Tracking Control General on May 5, 2018 to support launch of the Chang'e-4 relay satellite later in the month. CNS

The Yuanwang 6 space tracking vessel has left port in preparation to support the launch of the relay satellite required for China's ambitious Chang'e-4 lunar far side landing.

The Queqiao communications relay satellite is scheduled to launch from the Xichang Satellite Launch Centre on May 21 or later via a Long March 4C rocket, heading for an orbit beyond the Moon.

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Yuanwang 6 will track the spacecraft after launch from southwest China as it heads into orbit, observing its trajectory and providing survey and control capabilities.

Yuanwang space tracking ships, whose name means 'long view' play a vital role in China's space tracking and data network, with systems aboard providing accurate information.

A second ship, Yuanwang 7, is already sailing for an undisclosed location to support the launch, after assisting the launch of the Apstar-6C satellite from Xichang on Friday.

The relay satellite is a precursor to the Chang'e-4 lander and rover mission, which will attempt the first-ever soft-landing on the far side of the Moon in late 2018.

As the far side of the Moon never faces the Earth, due to tidal locking, the relay satellite is required to be in place beyond the Moon to facilitate communications between terrestrial ground stations and the Chang'e-4 lander and rover.

Its intended halo orbit around the second Earth-Moon Lagrange point more than 60,000 kilometres beyond the Moon will make it accessible to both ground stations on Earth and the lander on the lunar far side at all times.


Image demonstrating a halo orbit around the second Earth-Moon Lagrange point, from which the Chang'e-4 communications relay satellite will operate. NAOC/CAS

As well as its main communications role, the relay satellite will carry the Netherlands-China Low-Frequency Explorer (NCLE) for low-frequency radio astronomy experiments, and two microsatellites, named Longjiang-1 and Longjiang-2, test low frequency radio astronomy and space-based interferometry, as well as carry an amateur radio experiments.

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Космические полёты Китая - ChinaSpaceFlight
три часа назад

КИТАЙ ПЛАНИРУЕТ 21 МАЯ ЗАПУСТИТЬ СПУТНИКИ К ЛУНЕ

Пекин, /Синьхуа/. Обратная сторона Луны представляет большой научный интерес, однако для посадки на нее требуется ретрансляционный спутник для передачи сигналов. В КНР 21 мая 2018 года планируют запустить спутник-ретранслятор "Цюэцяо" (鹊桥) для обеспечения связи с межпланетной станцией "Чанъэ-4" при её предстоящей посадке на Луну.

Как сообщил заместитель главы Китайского национального космического управления (CNSA) У Яньхуа, вместе с ретрансляционным спутником на орбиту также будут выведены два микроспутника, разработанные Харбинским политехническим институтом и названные соответственно LongJiang-1 & 2 (龙江 一号 / 二号) "Лунцзян-1 & 2".

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"Лунцзян-1" и "Лунцзян-2" будут использоваться для экспериментов в сфере низкочастотной радиоастрономии. Космические аппараты будут летать вместе и вести наблюдение за небом Луны на длинных волнах, что соответствует крайне низкому частотному диапазону. 

"Запуск "Чанъэ-4" является одной из важных задач КНР. Это яркое событие в мировой космонавтике к которому приковано внимание многих стран", - отметил У Яньхуа. "Планируем осуществить два запуска. Первым из них станет запланированный на май запуск спутника-ретранслятора "Цюэцяо" для "Чанъэ-4", - сообщил он.. 

"Этот космический аппарат будет находиться в точке гравитационного равновесия Земли и Луны L2 (одна из точек Лагранжа) и будет обеспечивать связь для "Чанъэ-4", - рассказал У Яньхуа. "Это произойдет впервые в истории человечества", - подчеркнул специалист. 

Запуск самой автоматической межпланетной станции "Чанъэ-4" с посадочным модулем и луноходом который, как ожидается, совершит посадку на обратной стороне Луны /Бассейн Южный полюс-Эйткен/ запланирован в конце текущего года. 

http://www.chinanews.com/gn/2018/04-24/8498843.shtml

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Cosmic Penguin‏ @Cosmic_Penguin 1 ч. назад

Just saw unconfirmed rumors of the launch scheduled at around 21:00 UTC on May 20 (around 5 am LT May 21) on Chinese forums.

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Пока это только слухи...
http://bbs.9ifly.cn/forum.php?mod=redirect&goto=findpost&ptid=68507&pid=597448

据说21日凌晨5点发射，预祝成功！

Говорят, что запуск в 5 часов утра 21-го, желаю успеха!

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http://spacenews.com/china-preparing-to-launch-change-4-relay-satellite-may-21/

China preparing to launch Chang'e-4 relay satellite May 21
by Andrew Jones — May 14, 2018


The far side of the Moon and distant Earth, imaged by the Chang'e-5 T1 mission service module in 2014 Credit: Chinese Academy of Sciences

HELSINKI, Finland – China is set to launch a relay satellite to the second Earth-moon Lagrange point May 21, in a necessary precursor to the planned Chang'e-4 soft-landing on the lunar far side late in the year.

Chang'e-4 is the backup to the Chang'e-3 mission which put a lander and rover on Mare Imbrium in late 2013. Following that success, the lunar craft have been repurposed for a pioneering landing on the moon's far side.

The lunar far side does not face the Earth as the moon's orbital period matches its rotational period, thus requiring a relay satellite to facilitate communications.

Launch of the satellite will take place at the Xichang Satellite Launch Center in the southwest of the country via a Long March 4C rocket, with the three-day launch window opening on May 21.

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The relay satellite, recently named Queqiao – or Magpie Bridge, taken fr om a Chinese folklore tale that sees two lovers reunited once a year when a flock of magpies form a bridge across the Milky Way — will orbit around the Lagrange point around 65,000 kilometers beyond the moon, so as to be visible to both ground stations on the Earth and the lander and rover on the lunar far side at all times.

Its main function will be to relay telecommands from the ground to the Chang'e-4 lunar spacecraft and transmit data and telemetry back to Earth via S-band, while using x-band to communicate with the lander and rover.

Should launch and commissioning of the relay satellite proceed as planned, the lander and rover will be launched by a Long March 3B from Xichang around six months later, in November or December.

Ian Crawford, professor of planetary science and astrobiology at Birkbeck, University of London, told SpaceNews the mission would be a "tremendous undertaking, as it would be the first time any spacecraft has successfully landed on the far side of the moon."

The landing is currently expected to target the Von Kármán crater within the South Pole-Aitken Basin, though a decision on the final site has not been announced by Chinese scientists.

The South Pole-Aitken Basin is, Crawford notes, a high priority scientific objective for exploration, potentially offering unique insights into the formation of the moon and history of the solar system.

Astronomy goals

The relay satellite, developed by the China Academy of Space Technology, will also carry the Netherlands-China Low-Frequency Explorer (NCLE), a low-frequency, space-based astronomy pathfinder experiment that will attempt to detect radio signals from the cosmic dark ages, before emission of light by the first stars in the universe.

Radioastronomybelow around 30 MHzcan only be carried outeffectively outside of the Earth's ionosphere, and the satellite's position beyond the moon will allow it to take a unique look at this largely unexplored region of the electromagnetic spectrum, with minimal interference from Earth.

Professor Heino Falckeof Radboud Universityin the Netherlands and part of the NCLE team told SpaceNewshe doesn't want to set the bar too high for this attempt at picking up a cosmic dark ages signal. It could put an upper lim it on the signal and is expected to be instructive for future low frequency astronomy space missions.

Along with its main objective, NCLE will also aim to characterize the galactic background and measure emissions from the Sun and Jupiter, as well as measure the wake of the solar wind behind the moon.

Falcke says getting the instrument ready in time and integrated on the spacecraft was a "ride on the edge," with the call for international participation in Chang'e-4 only coming in 2015, and the Dutch team needing to develop their own antenna from scratch, due to ITAR regulations limiting exports to China.

The antenna is only expected to be deployed for use sometime in 2019, after the main Chang'e-4 mission, with the rover having a designed operation time of three months on the lunar surface.

The May launch will also carry two microsatellites, named Longjiang-1 and 2 and meaning 'dragon river', which were developed by the Harbin Institute of Technology (HIT) in north-eastern province of Heilongjiang.

The pair will carry synchronized receivers for low frequency astronomy and very long baseline interferometry experiments and operate in a highly elliptical lunar orbit. They will also be available for amateur radio tests, with one of the two 45-kilogram, 50x50x40-centimeter satellites also set to carry a micro optical camera developed by the King Abdulaziz City for Science and Technology (KACST) of Saudi Arabia.

The launch this month will be China's fifth lunar mission, following two orbiters, Chang'e-1 and Chang'e-2 in 2007 and 2010 respectively, Chang'e-3 in 2013, and the 2014 Chang'e-5 T1 probe which flew a capsule around the moon and back to test re-entry for a planned lunar sample return. The full sample mission, Chang'e-5, is expected to take place in 2019.

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https://gbtimes.com/heres-what-you-need-to-know-about-chinas-change-4-relay-satellite-launch

Here's what you need to know about China's Chang'e-4 relay satellite launch
by Andrew Jones | May 17, 2018 17:07 | CHINA ▪ SICHUAN PROVINCE ▪ MOON


The far side of the Moon and the distant Earth, imaged by the Chang'e-5T1 mission in 2014. Chinese Academy of Sciences

China is preparing to launch its Chang'e-4 relay satellite into an orbit beyond the Moon late on May 20, or later on in the three-day launch window.

The mission is the first of two launches that aim to bring about the first-ever landing on the far side of the Moon. Here's what need to know about its job, astronomy goals, orbit and more.

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Communications for lunar far side landing

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The Chang'e-4 relay satellite, named Queqiao ('magpie bridge'), is a precursor to an unprecedented attempt to soft-land on the lunar far side in late 2018, when a lander and rover will be send to the Moon.

As the far side of the Moon never faces the Earth, the communications relay needs to be in place in order to facilitate the sending of commands from the Earth to the spacecraft on the Moon, and getting data and telemetry back from the lander and rover down to waiting ground stations.

This is the main role of the 425 kg spacecraft, developed by the China Academy of Space Technology (CAST), which is being sent into position around six months before the landing mission in order to test and verify is functions.


A rendering of the Chang'e-4 relay satellite, to launch in May 2018, and lander and rover to set down on the lunar far side in late 2018. Chinese Academy of Sciences

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Earth-Moon Lagrange point orbit

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To be able to do this, the relay satellite needs to have a line of sight to both ground stations on Earth and the Chang'e-4 lander and rover simultaneously.

To achieve this, the relay satellite will take advantage of a gravitationally stable point, called a Langrange Point, that will allow it to remain in a stable orbit with respect to the Earth and Moon.

By orbiting in a halo (or sometimes Lissajous) around the second Earth-Moon Langranian point, between 65,000 and 80,000 km beyond the Moon, the relay satellite will by able to stay visible to the ground and far side of the Moon, using S-band and X-band frequencies for communications.

The spacecraft is expected to reach E-M L2 around 8-9 days after launch, following a lunar swing-by.


Launch profile for the Chang'e-4 communications relay satellite. Chinese Academy of Sciences

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Pioneering astronomy and cosmic dark ages

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The satellite will, along with its communications role, also carry a radio antenna to carry out low frequency astronomy which is not possible on Earth, with frequencies below 10 to 30 MHz blocked by the atmosphere.

The Netherlands-China Low-Frequency Explorer (NCLE) was developed by Radboud University in Nijmegen, the Netherlands Institute for Radio Astronomy (ASTRON) and Dutch company Innovative Solutions In Space (ISIS), and integrated with the relay satellite in April.

Marc Klein Wolt of Radboud University and NCLE project leader says the experiment will begin after lander and rover operations, sometime in 2019. Once the antenna is deployed it will open a new window on the universe with unprecedented observations and set the stage for future missions.

Beginning with observations of solar activity and Jupiter emissions and aurora to establish the solar system baseline - or background radio environment - it will then attempt to detect the faint, redshifted signals from after the Big Bang when the first stars were beginning to form.

As this is a pathfinder mission, Wolt says he hopes to, "get enough time and have our instrument sufficiently calibrated that we can put some constraints on the signal from the cosmic Dark Ages."

Asked if NCLE could also - despite not being a science objective for the team - contribute to the search for extraterrestrial intelligence (SETI), Wolt says that, "In principle it could, as we are opening a new window on the universe, but I'm not expecting to find ET."

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Queqiao - Magpie Bridge

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The name for the relay satellite, Queqiao - or magpie bridge - comes from a Chinese myth and was announced late last month at an event marking China's third Space Day.

The name comes from the Chinese myth and love story of the Weaver Girl and the Cowherd. Separated by the Silver River, which symbolises the Milky Way, the lovers are reunited for one day each year by a bridge formed by a flock of magpies - Queqiao (鹊桥) - allowing them to cross the heavens.


Star-crossed lovers Niulang and Zhinu are permitted to be together one day year by a bridge of magpies, during the Qixi Festival. The painting is in the Long Corridor of the Summer Palace in Beijing. Public Domain

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Piggybacking microsatellites

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Also along for the Long March 4C ride from Xichang to the Moon will be two microsatellites developed by the Harbin Institute of Technology (HIT).

Named Longjiang-1 and Longjiang-2 (meaning 'river dragon'), the 45-kg, 50x50x40-cm sats will not follow the relay satellite to the Lagrange point, but instead operate in a highly elliptical orbit around the Moon (300 x 9,000 km).

There, the pair, using 1-metre antennas, will test low frequency radio astronomy and space-based interferometry, as well as amateur radio activities. It will also carry a small optical camera developed by Saudi Arabia.

The size of the satellites and need for fuel for propulsion means they will operate for only 10 minutes at a time for observation, followed by 20 minutes for data transmission. The aim is technical verification for future missions.


Testing on the Chang'e-4 DSLWP-A1 and DSLWP-A2 microsatellites in early 2018. CCTV/Youtube/Framegrab

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Chang'e-3 backup

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The lander and rover for the Chang'e-4 mission were originally manufactured at the same time as the Chang'e-3 spacecraft, which landed on the Moon in late 2013, in order to provide a backup mission in case of launch failure or other issues.

These spacecraft, totalling near 4,000 kg, have now been repurposed for objectives on the lunar far side, and have recently been progressing through space environment tests.

Cameras on Chang'e-3 returned astounding images from Mare Imbrium, and the same is hoped for Chang'e-4. Chang'e-3 made a number of discoveries with its instruments, including multiple distinct layers beneath the surface, suggesting the Moon has a more complex geological history than previously thought.


A view of Mare Imbrium taken by China's Chang'e-3 mission. Chinese Academy of Sciences

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The landing - Von Kármán crater?

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China has finalised, but not officially announced, the site for the Chang'e-4 landing. Candidates have been stated to be within the Von Kármán impact crater within the South Pole-Aitken Basin.

Ian Crawford, professor of planetary science and astrobiology at Birkbeck University of London, told gbtimes.com in 2016 that a successful landing would be an, "enormously significant event in the history of space exploration, in the exploration of the Moon, and a tremendous boost for lunar science."

Crawford explains that the 2,500 kilometre diameter and roughly 13-kilometre-deep impact crater is an intriguing site, which could tell us more about the deep interior of the Moon than any other landing site so far.

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Launch - live?

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Latest indications are that the Long March 4C carrying the relay satellite will launch around 21:00 UTC on Sunday, May 20 (17:00 EDT; 05:00 Beijing time May 21).

China has previously provided live footage of its lunar missions, but there is no word yet on possibilities for this launch. Check here for updates.

The European Space Agency provided ground station support for Chang'e-3 and other Chinese lunar missions, but Chang'e-4 will rely solely on Chinese facilities, thanks in part to a new, 35m-diameter parabolic antenna in Argentina.

Yuanwang space tracking ships are also in position ready in the Pacific, ready to observe the rocket's trajectory and providing survey and control capabilities as it heads to orbit.


Preparations for the November 2017 launch of the Beidou-3 M1 and M2 satellites via Long March 3B from Xichang, Sichuan Province. beidou.gov.cn

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Chinese lunar exploration past and future

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Chang'e-4 will be China's fifth mission, following two orbiters (Chang'e-1 and 2), the 2013 Chang'e-3 lander and rover, and a 2014 test mission.

This last mission, the Chang'e-5 T1 mission to test reentry on return from the Moon in preparation for a sample return missions, gave hints that China was considering a lunar far side landing. These clues were picked up on and reported by Emily Lakdawalla of the Planetary Society.

China is also preparing for a (delayed) sample return mission, Chang'e-5, in 2019, and is developing a plan for expanding its lunar exploration programme, with the lunar south pole expected to be the main target.

For latest news and developments on the mission, see our feature on China's Chang'e-4 mission to the far side of the Moon


The Moon's south pole as seen by the 1994 NASA Clementine mission. NASA/Goddard Space Flight Center Scientific Visualization Studio

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Marc Klein Wolt‏ @MarcWolt 22 мин. назад

Follow the Chang'e 4 launch to the moon with the Dutch NCLE instrument on the http://RU.nl  website! @RadRadioLab @ASTRON_NL @isis_space @Radboud_Uni

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http://www.ru.nl/english/news-agenda/news/vm/imapp/astrophysics/2018/ready-launch-dutch-radio-antenna-depart-moon/

Ready to launch: Dutch radio antenna to depart for the moon on Chinese mission
Date of news: 17 May 2018

On 20 May 2018*, the Chinese space agency will launch the relay satellite Chang'e 4 to an orbit behind the Moon. On board will be a Dutch radio antenna, the Netherlands Chinese Low-Frequency Explorer (NCLE). The radio antenna is the first Dutch-made scientific instrument to be sent on a Chinese space mission, and it will open up a new chapter in radio astronomy. With the instrument, made by engineers from the Radboud Radio Labof Radboud University, ASTRON, the Netherlands Institute for Radio Astronomy in Dwingeloo, and the Delft-based company ISIS, astronomers want to measure radio waves originating from the period directly after the Big Bang, when the first stars and galaxies were formed.

*DISCLAIMER: The launch depends on favorable weather conditions, therefore, the launch may be delayed. Follow the launch via Radboud Radio Lab.

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The far side of the moon

Why is it so important for the measuring instruments to be placed behind the moon? Professor of Astrophysics from Radboud University and ASTRON Heino Falcke: "Radio astronomers study the universe using radio waves, light coming from stars and planets, for example, which are not visible with the naked eye. We can receive almost all celestial radio wave frequencies here on Earth. We cannot detect radio waves below 30 MHz, however, as these are blocked by our atmosphere. It is these frequencies in particular that contain information about the early universe, which is why we want to measure them."


The satellite rotates around a fixed point behind the moon – the second Lagrange, or L2, point in the Earth-moon system. This point is located approximately 65,000 kilometers from the moon.

Special about the radio antenna is that it will receive radio waves with a large frequency range. "In the past this was not possible and therefore a receiver with a narrow frequency band was used, in order to avoid electromagnetic interference of the satellite itself," Albert-Jan Boonstra of ASTRON explains. "We have now succeeded in avoiding the electromagnetic interference and making a broadband receiver. That is, of course, good news for subsequent missions and can, for example, be used for future nano-satellites."

Ready to launch? Final test

The instrument passed an important risk assessment review by the Chinese space agency at the end of April. Marc Klein Wolt, Managing Director of the Radboud Radio Lab, looks back on the endeavour with a sense of accomplishment: "The last few months have been quite challenging for the Dutch team, who have put in a lot of effort to complete the instrument for the launch as the final phase of a two-year bi-lateral project with our Chinese counterparts. The Chinese lunar programme is like a bus we were trying to catch, mostly due to the hard work and enormous dedication from the teams on both sides".

On April 30, the antenna successfully passed final pre-flight test. Heino Falcke reported: "Antennas were successfully deployed and retracted. Next step in this adventure is L2-point behind moon."


The radio antenna  Netherlands Chinese Low-Frequency Explorer (NCLE) developed by Radboud Radio Lab of Radboud University, ASTRON, ISIS and the Chinese National Astronomical Observatory of the Chinese Academy of Sciences (NAOC).

Collaboration with China

In 2016 the Netherlands Space Office and its Chinese counterpart CNSA signed an agreement to cooperate in this project, which was an elaboration of the Memorandum of Understanding the two space agencies signed the year before during a trade mission in presence of the Chinese President Xi Jinping and the Dutch King Willem Alexander. "NCLE does not only pave the way for new exciting science, but also provides new means for the two countries to expand their international collaboration", says Mr. Harry Forster of the NSO.

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Эмблема NCLE

https://img.novosti-kosmonavtiki.ru/220255.gif

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http://www.spaceflightfans.cn/31893.html
Местными властями выпущено предупреждение о предстоящем пуске и рекомендации по поведению населения в районах падения отделяемых частей ракеты носителя при пуске КА Цюэцяо

1、发射时间：2018年5月21日凌晨5时左右。

1, время запуска: 21 мая 2018 года около 5 часов утра.

05:00 BJT 2018-05-21 --> 21:00 UTC 2018-05-20

[Liss]

Ронять ступень будем сюда:

J4031/18 - ALTN RTE FOR A582/R595/Y579/Y27/Y533/Y531/Y59/ ARE ESTABLISHED DUE TO SPACEFLIGHT ACTIVITIES. 1.FLT PLANNED RTE IS REQ TO BE FILED AS FLW (1)A582:  (BTN MAMIK AND NIMOX) ALTN RTE: NHC V91 MJC-ALBAX-NIMOX (2)R595:  (BTN MJC AND TUNTO) ALTN RTE: MJC-ALBAX-NIMOX-TUNTO (3)Y579: (BTN AZAMA AND SAKON) ALTN RTE: AZAMA Y74 NHC V91 MJC-ALBAX-NIMOX (4)Y27: (BTN AMMEK AND SAKON) ALTN RTE: YURIX Y62 IKEMA-ALBAX-NIMOX (5)Y533: (BTN ALBAX AND AZAMA) ALTN RTE: ALBAX-IKEMA Y57 AZAMA (6)Y531: (BTN ALBAX AND YURIX) ALTN RTE: ALBAX-IKEMA Y62 YURIX (7)Y59: (BTN KAZIK AND AZAMA) ALTN RTE: AZAMA Y74 NHC V91 MJC B462 KAZIK 2.SEE NOTAM RJAAYNYX J4030/18. SFC - UNL, 2125/2140 2255/2310, 20 MAY 21: 25 2018 UNTIL 20 MAY 23: 10 2018. CREATED:  18 MAY 09: 51 2018
J4030/18 - DUE TO SPACEFLIGHT ACTIVITIES,THE FLIGHT SAFETY OF THE AIRCRAFT IN FOLLOWING AREAS MAY BE AFFECTED ON MAY 20, 2018 DETAILS ARE AS FOLLOWS:  ON MAY 20,2018 FROM 21: 31-21: 40 UTC AND 23: 01-23: 10 UTC AREA:  242432N1271117E 234250N1265819E 240231N1254146E 244420N1255418E,FOUR-POINT CONNECTION RANGE. VERTICAL ALTITUDE: SFC-UNL RMK/ATC WILL NOT CLEAR IFR FLT THRU THIS AREA FOR THE FLIGHT SAFETY. SFC - UNL, 2131/2140 2301/2310, 20 MAY 21: 31 2018 UNTIL 20 MAY 23: 10 2018. CREATED:  18 MAY 09: 49 2018

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NOTAMs на материковую часть всё ещё не выпущены, но по опубликованным предупреждениям местному населению составлена карта трассы полёта

https://www.weibo.com/6180132521/GhciSigPi?type=comment#_rnd1526656015556

https://img.novosti-kosmonavtiki.ru/220250.jpg

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Код миссии - «07-87»

http://www.spaceflightfans.cn/31950.html

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http://www.xinhuanet.com/english/2018-05/18/c_137188922.htm

China to launch relay satellite for Chang'e-4 lunar probe
Source: Xinhua| 2018-05-18 15:22:35 | Editor: Xiang Bo

BEIJING, May 18 (Xinhua) -- China plans to launch a relay satellite into space next Monday, May 21, for the Chang'e-4 lunar probe scheduled later this year.

The Chang'e-4 lunar probe will undertake the first ever soft landing on the far side of the Moon. However, direct communication with the far side of the Moon is not possible, which is one of the many challenges of the Chang'e-4 lunar probe mission.

The relay satellite, named Queqiao, will be responsible for transmitting signals between the Earth station and the Chang'e-4 lander and rover.

Relay satellites are communication satellites that can provide data relay and monitoring services for spacecraft, improving the efficiency and emergency capability of various satellites. They also enable data from earth resource and environmental satellites to be transmitted in real time.

The Chang'e-4 probe will also carry scientific payloads for four countries, including the Netherlands and Germany.

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Синьхуа
http://russian.news.cn/2018-05/18/c_137189181.htm

Китай запустит спутник-ретранслятор для лунного зонда "Чанъэ-4" в следующий понедельник
2018-05-18 17:05:10丨Russian.News.Cn

Пекин, 18 мая /Синьхуа/ -- Китай запланировал запустить в следующий понедельник, 21 мая, спутник-ретранслятор для лунного зонда "Чанъэ-4".

"Чанъэ-4" будет запущен в конце нынешнего года и совершит первую в истории человечества посадку на обратной стороне Луны. Прямая связь с обратной стороны Луны невозможна, что является одним из главных вызовов миссий "Чанъэ-4".

Спутник-ретранслятор под названием "Цюэцяо" будет отвечать за передачу сигналов между наземной станцией и луноходом "Чанъэ-4".

Спутник-ретранслятор - это коммуникационный спутник, который может предоставлять услуги передачи данных и мониторинга для космических аппаратов, а также позволяет повысить эффективность и способность реагирования во время аварийных ситуаций различных спутников. Он также способен передавать данные от наземных ресурсов и экологических спутников в режиме реального времени.

Зонд "Чанъэ-4" также доставит на Луну научное оборудование для четырех стран, включая Нидерланды и Германию.

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Одна из местных листовок с оповещением населения о пуске

https://img.novosti-kosmonavtiki.ru/220251.jpg

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http://www.sciencemag.org/news/2018/05/china-s-moon-mission-will-probe-cosmic-dark-ages

China's moon mission will probe cosmic dark ages
By Daniel Clery | May. 16, 2018, 3:00 PM

On 21 May, China plans to launch a satellite with a vital but unglamorous mission. From a vantage point beyond the moon, Queqiao, as the satellite is called, will relay data from Chang'e 4, a lander and rover that is supposed to touch down on the lunar far side before the end of the year. But a Dutch-made radio receiver aboard Queqiao will attempt something more visionary. In the quiet lunar environment, it will listen to the cosmos at low frequencies that carry clues to the time a few hundred million years after the big bang, when clouds of hydrogen gas were spawning the universe's first stars.

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The mission is a proof of principle for other efforts to take radio astronomy above the atmosphere, which blocks key radio frequencies, and far from earthly interference. "Putting the whole show into space is extremely appealing," says Michael Hecht of the Massachusetts Institute of Technology's Haystack Observatory in Westford, whose team is also developing small radio satellites that could be used to probe the cosmos. For Europe's astronomers, it is also a test of cooperation with China, something their U.S. counterparts at NASA are barred from doing.

The Netherlands-China Low-Frequency Explorer (NCLE) project stems from a 2015 Dutch trade mission to China, during which the two countries agreed to collaborate on space missions. The Netherlands is strong in radio astronomy: Its Low-Frequency Array (LOFAR) stretches across much of northern Europe. NCLE Principal Investigator Heino Falcke, of Radboud University in the Netherlands, has long advocated a "LOFAR on the moon." China has an ambitious program of moon missions, so he jumped at the chance to take a first step. "We put together a proposal in 2 weeks," he says. Once funded, the team had just 1.5 years to build the instrument. "Half of the experiment is how you work together" Falcke says. Jinsong Ping of the National Astronomical Observatories of China in Beijing, who leads the Chinese team working on the NCLE, agrees: "It is really challenging both sides. ... Different culture, habit, language, working manner."

To see back into the dark age before the first stars, astronomers look for a signal emitted when electrons in the primordial neutral hydrogen gas spontaneously flipped their orientation. These photons started out with short radio wavelengths, but over their more than 13-billion-year journey to Earth, the universe's expansion stretched them out to long wavelengths, or low megahertz frequencies. After the gas clumped together to form the first stars, their radiation ionized the neutral gas and eventually snuffed out the faint signal.

Telescopes such as the LOFAR aim to detect the ancient signal and use it to map the distribution of primordial matter. But the signal is hard to discern in the maelstrom of radio noise from terrestrial sources and other objects across the universe. Only one detector, the Experiment to Detect the Global Epoch of Reionization Signature, a set of ground-based antennas in Australia, has so far claimed a detection.

Queqiao, orbiting a gravitational balance point beyond the moon called L2, will offer a quieter vantage. In order to relay signals from the moon to Earth, the satellite can't be completely in the moon's shadow, which means that Earth noise could still be a problem, says Jack Burns, an astronomer at the University of Colorado in Boulder who has long campaigned for a lunar radio observatory. Burns adds that the spacecraft itself will also be a source of interference. But by testing hardware in space, the NCLE "will set the stage for other missions."

Once Queqiao arrives at L2, the NCLE will wait its turn until after the Chang'e 4 lander has achieved its main mission: exploring the South Pole-Aitken Basin, a huge far side depression. Then, around March 2019, the instrument will unspool three 5-meter-long carbon-fiber antennas, each at right angles to the others.

Because Earth's atmosphere blocks all radio signals below 30 megahertz, the data will delight a range of astronomers. Falcke says the team will study solar flares, the aurora of Jupiter, and the galaxy's radio emissions. "There's nothing as good as having real data," he says. The dark age signal is a long shot, he admits. Realistically, the mission is about "gaining expertise to build a follow-up."

The Chinese NCLE team has its own plans. It has placed basic receivers on the Chang'e 4 lander and two microsatellites that Queqiao will release into lunar orbit to study solar radio bursts. Ping says his team will also try to combine signals received by the NCLE with those taken by earthbound detectors—a technique known as interferometry, which can improve resolution. "It is a demonstration," he says. It could show that, once detectors are sensitive enough, interferometry could help them map the newborn universe.

Burns and his colleagues are working on a proposal for a small satellite called the Dark Ages Polarimetry Pathfinder, which he says will be more sensitive to the dark age signal. But eventually, he wants to see an observatory on the lunar far side, deep with the moon's radio quiet shadow. He predicts a NASA-funded low-frequency telescope in the next 5 years. "There's great interest in the far side."

*Correction 18 May, 9:55 a.m.: This story has been updated to correct the length of the antennas of the Netherlands-China Low-Frequency Explorer.

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