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Chang'e-4

First lander and rover on the Moon's far side

Mission lead
China
Launch Date
8 Dec 2018
Destination
Von Kármán crater
Current status
Science operations

Chang'e-4 (嫦娥四号) and Yutu-2 (玉兔二) are the world’s first lander and rover missions to the Moon’s far side. In December 2018, they landed within the South Pole-Aitken basin, where an ancient lunar impact may have exposed the Moon’s mantle. By studying this region directly, scientists will learn more about the early solar system and Earth. The mission also demonstrates the feasibility of future human and robotic far side missions.

The Moon’s quiet, airless far side makes it one of the best places in the inner solar system for science applications like radio astronomy. But missions there require a relay satellite, since the far side never faces Earth. China launched the Queqiao relay satellite with two SmallSats, Longjiang-1 and 2, in May 2018.

Current status: Chang’e-4 and Yutu-2 are conducting science operations. Both vehicles power down during lunar nights — a roughly 2-week period each month — when their location is in darkness.

Yutu-2 as seen from Chang'e-4

CNSA / CLEP

Yutu-2 as seen from Chang'e-4
Chang'e-4 imaged the Yutu-2 rover in early January 2019 using its Terrain Camera (TCAM).

Mission milestones

Landing site

Landmarks near the Chang’e-4 landing site
Landmarks near the Chang’e-4 landing site

Ivica Stošić / Emily Lakdawalla

Landmarks near the Chang’e-4 landing site
The base image is a simulated view of the farside of the Moon using Kaguya topographic data and Clementine images. The overlay shows landmarks useful in locating the Chang’e-4 landing site inside Von Kármán crater.

Lander overview

Chang’e-4 lander

CNSA

Chang’e-4 lander
A render of the Chang’e-4 lander on the lunar far side.

Lander science instruments:

Landing Camera (LCAM): Used to image the surface during descent. Chang’e-3 carried a similar camera and captured this video. Mounted on the bottom of the spacecraft. Monochrome, 1024x1024 detector, 45 degrees FOV, spectral range 419-777 nm. Yingzhuo Jia et al. (2018)

Terrain Camera (TCAM): Used to image the lander’s surroundings. Chang'e-3 carried a similar camera that failed in the first lunar night. Mounted on a camera bar on top of the lander that can rotate a full 360 degrees, swing up or down 120 degrees total. Color (RGB), 2352 x 1728 detector, 22.9 x 16.9 FOV, spectral range 420-700 nm. Yingzhuo Jia et al. (2018)

Low Frequency Spectrometer (LFS): Newly developed for Chang’e-4. Astronomers have long dreamed of placing radio telescopes on the radio-quiet, airless far side of the Moon. The LFS will investigate low-frequency waves from the lunar ionosphere, the Sun, interplanetary space, and galactic space. LFS consists of three, 5-meter booms. Yingzhuo Jia et al. (2018)

Lunar Lander Neutrons and Dosimetry experiment (LND): Contributed by University of Kiel, Germany. On Earth, people who work near radioactive sources like a nuclear reactor wear dosimeters to measure the amount of radiation their bodies receive. Likewise, the LND experiment will measure radiation dosages on the Moon and use the data to plan for future human exploration. The neutron counts could also be used to measure the amount of water in the regolith beneath the lander. LPSC poster, Yingzhuo Jia et al. (2018)

Lunar biosphere experiment: A publicly chosen experiment in partnership with 28 Chinese universities to see how silkworms, as well as potato and Arabidopsis (a small flowering plant) seeds, grow in lunar gravity. Image

Yutu-2 overview

Yutu-2

CNSA

Yutu-2
A render of the Yutu-2.

Yutu-2 science instruments

Panoramic Camera (PCAM): An imaging system similar to the one on the first Yutu rover. Two cameras on a rotating mast, allowing a full 360-degree view. Color (RGB) and panchromatic, 2352 by 1728 pixels each, 19.7 x 14.5 degrees FOV each, spectral range 420-700 nm. Yingzhuo Jia et al. (2018) | Chang’e-3 PCAM library

Lunar Penetrating Radar (LPR): A radar instrument used to see subsurface up to more than 100 meters, and the thickness of regolith. Similar to radar used on the first Yutu rover. Yingzhuo Jia et al. (2018)

Visible and Near-Infrared Imaging Spectrometer (VNIS): Used to study the mineral composition of the lunar surface around the rover. Similar to spectrometer used on first Yutu rover. Band range 450-950 (visible near-infrared channel), 900-2400 (near-infrared short-wave infrared). Yingzhuo Jia et al. (2018)

Advanced Small Analyzer for Neutrals (ASAN): Contribution from Institute of space physics, Sweden. Experiment to determine how the solar wind interacts with the lunar regolith by observing energetic particles blasted off the surface. Presentation | Yingzhuo Jia et al. (2018)

Editor’s note: The following instruments were referenced in Wang & Lui (2016) as provisional, but are not included in Yingzhuo Jia et al. (2018), and presumably not aboard Change’e-4: Lunar Dust Analyser (LDA), Electric Field Analyser (EFA), Plasma and Magnetic Field Observation Package (PMFOP), and Lunar Seismometer (LS).

External resources

Key scholarly articles:

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