China ready to launch world’s first lunar sample return mission since 1976

The Chang’e 5 lunar orbiter, lander, and sample collection return vehicle is on its sea-side… The post China ready to launch world’s first lunar sample return mission since 1976 appeared first on NASASpaceFlight.com.

China ready to launch world’s first lunar sample return mission since 1976

The Chang’e 5 lunar orbiter, lander, and sample collection return vehicle is on its sea-side launch pad at the Wenchang Spacecraft Launch Center in Wenchang, Hainan province, People’s Republic of China.

The mission will launch on a Chang Zheng 5 heavy lift rocket, with liftoff expected within a 50 minute launch window that extends from 20:25 to 21:15 UTC (16:25 to 17:15 EST) on 23 November.  The launch will send its lunar payload on a 6 day journey to our closest celestial neighbor.

The Chang’e 5 mission, named after the Chinese goddess of the Moon, is the People’s Republic of China’s first-ever sample return mission and the first to be attempted by any agency or company globally since the 1976 Luna 24 flight by the Soviet Union.

If successful, Chang’e 5 would make China the third country to return lunar samples to Earth after the United States and the Soviet Union.

The launch vehicle tasked with beginning Chang’e 5’s journey to Earth’s natural satellite is the Chang Zheng 5. It is the most powerful Chinese rocket in operation and the third most powerful launcher in the world after the Falcon Heavy and Delta IV Heavy vehicles.

Chang’e 5 will mark the sixth flight of the Chang Zheng 5 family, including a single flight of the 5B variant.

Chang Zheng 5 launches its fifth flight, carrying the Tianwen-1 Mars mission – via Xinhua

The initial phase of flight will be powered by a liquid hydrogen and liquid oxygen fueled first stage, under thrust from two YF-77 engines as well as four RP-1 kerosene and liquid oxygen fueled boosters with two YF-100 engines each.

The boosters will separate less than three minutes after liftoff, while the first stage continues to burn for upwards of eight minutes.

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  • The liquid hydrogen and liquid oxygen second stage will then take over, powered by a pair of YF-75D engines. This stage will be responsible for carrying the Chang’e 5 spacecraft to its initial parking orbit.

    That parking orbit, based on mission specific information released by China and navigational warnings issued by the People’s Republic of China, will be inclined 23.5 degrees to the equator.

    The ground track of the launch will carry the rocket over The Philippines — with side booster and payload fairing drops zones flanking the large, northern island of Luzon.

    However, the core stage has a drop zone that encompasses several populated islands of the Federated States of Micronesia.

    This follows a pattern of China’s continued launch over populated areas (though in this case, the nation is launching mainly over water) and several recently high-profile incidents of highly toxic and uncontrolled rocket stages crashing into villages and barely missing heavily traffic bridges.

    The trajectory of this mission means that a failure after booster separation but before payload fairing separation would result in debris coming down over The Philippines.

    After reaching its initial parking orbit, the second stage and payload will perform a coast maneuver before the stage re-iginites its engines for the Trans-Lunar Injection (TLI) burn to send the mission on its way to the Moon.

    The coast phase between TLI and Lunar Orbit Insertion (LOI) lasts 112 hours, with the Chang’e 5 spacecraft arriving in Lunar Orbit on 28 November. Meanwhile, on 27 November, the Sun will rise over Mons Rümker — the 70 kilometer diameter, 1.1 kilometer high lava mound on the Moon’s near side that has been selected as the mission’s landing site.

    Mons Rümker, located in the Oceanus Procellarum (“Ocean of Storms”), has had volcanic activity much more recently than other areas of the Moon, meaning samples collected there may include some of the youngest lunar material yet collected for study. Examining this material will not only improve the understanding of the Moon’s geology, but also those of other planetary bodies as well.

    The landing site also has a high concentration of radiogenic heat-producing elements, such as Thorium, Uranium, and Potassium. The combination of these factors made the site an attractive scientific point of interest.

    Four robotic missions (Luna 9, Luna 13, Surveyor 1, and Surveyor 3) have explored parts of the Oceanus Procellarum, as did the human Apollo 12 mission.  Chang’e 5 is the first mission, however, to Mons Rümker.

    Once in lunar orbit, the Chang’e 5 spacecraft will separate into two vehicles: an orbiter (retaining the Earth return capsule) and a lander equipped with an ascent vehicle.

    Landing at Mons Rümker is expected at approximately 20:30 UTC (15:30 EST) on 29 November. If successful, it would be China’s third soft landing on the surface of the Moon.

    Mons Rümker, imaged by NASA’s Lunar Reconnaissance Orbiter – via NASA

    The lander, which does not include a rover but rather remains stationary on the lunar surface, will collect up to 2 kilograms of samples from depths of up to 2 meters. It is equipped with a drill and a scoop for collecting the samples, aided by a Lunar Mineralogical Spectrometer and a Lunar Regolith Penetrating Radar.

    Also on board the lander is a panoramic camera, which will be used for photography of the lunar surface. The Chang’e 5 lander relies on solar power for its mission, driving the requirement to land at Mons Rümker shortly after sunrise.

    After the samples have been collected, they will be stored on the ascent vehicle. The ascent vehicle will then launch from the lunar surface on 2 December. An automated rendezvous and docking with the orbiter in lunar orbit will then occur on 4 December. The samples will then be transferred from the ascent vehicle to the return capsule, and the orbiter will depart lunar orbit on 10 December for another 112 hour transfer to Earth.

    The return capsule will separate from the orbiter for reentry and landing on 15 December. The capsule will land under parachute in Siziwang Banner, Inner Mongolia, People’s Republic of China. The sealed samples will then be collected and transported for study and analysis.

    European scientists are expected to access these samples and collaborate with Chinese teams on the subsequent research, but United States scientists will likely be excluded as American law forbids the use of federal funding to collaborate with Chinese scientists.

    The European Space Agency is an active partner in the Chang’e 5 mission, assisting in tracking the spacecraft during two crucial phases of flight.

    Graphic showing the phases of flight during which ESA ground stations will support the Chang’e 5 mission – via ESA

    Shortly after launch, an ESA ground station in Kourou, French Guiana — home to the European launch provider Arianespace — will establish a communications link and verify the health of the spacecraft.

    Near the conclusion of the mission, a ground station in Maspalomas, Spain, will track the spacecraft during its return to Earth. Other ESA ground stations will be on standby as backups to Chinese tracking stations throughout the mission.

    The launch of Chang’e 5 will likely preface the use of the Chang Zheng 5 rocket to construct a new Chinese space station in low Earth orbit beginning in 2021. With regards to the Chinese National Space Administration’s lunar exploration program, the Chang’e 6 mission is being developed as a backup to Chang’e 5 should any issues prevent a successful mission.

    However, a successful Chang’e 5 mission would pave the way for Chang’e 6 to complete another sample return mission from a different location on the lunar surface.

    Subsequent Chinese exploration plans include crewed missions to the lunar surface, a goal shared with NASA and other international space agencies.

    (Lead photo via CASC)

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    Source : NASA More