Abstract
China’s Chang’e-4 (CE-4) mission is the first human lander/rover mission on the far side of the Moon. Its probe is composed of a lander, rover, and the Queqiao relay satellite. Queqiao was successfully launched on May 21, 2018, and entered the halo orbit of the L2 point on June 14, becoming the first satellite connecting the Earth and the Moon’s far side. The lander carrying Yutu-2 was successfully launched on December 8, 2018, and landed in the Von Kármán crater (45.5° S, 177.6° E) at 10:26 (UTC+8) on January 3, 2019. The CE-4 probe carried nine science instruments. Four instruments are on the lander: a landing camera (LCAM), a terrain camera (TCAM), a low-frequency radio spectrometer (LFRS), and a lunar lander neutrons and dosimetry (LND) provided by Germany. Four instruments are on the rover: a panoramic camera (PCAM), a visible and near-infrared imaging spectrometer (VNIS), a lunar penetrating radar (LPR), and an advanced small analyzer for neutrals (ASAN) provided by Sweden. The instrument on the relay satellite is the Netherlands-China Low-Frequency Explorer (NCLE). The scientific objectives of the CE-4 mission include (1) performing low-frequency radio-astronomical observations; (2) investigating the geomorphology, mineral compositions and shallow subsurface structure of the landing and roving sites; and (3) detecting the Earth-Moon space environment at the lunar far side. As of February 1, 2020, CE-4 has completed 14 lunar days of scientific exploration after one year of operation. The components, fight, scientific objectives and investigation of CE-4 are introduced in this paper. We also describe the accessibility of the initial archived science data and their preliminary analysis results.
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References
F. Allegrini, M.A. Dayeh, M.I. Desai, H.O. Funsten, S.A. Fuselier, P.H. Janzen, D.J. McComas, E. Möbius, D.B. Reisenfeld, M.D.F. Rodríguez, N. Schwadron, P. Wurz, Lunar energetic atom (ENA) spectra measured by the interstellar boundary explorer (IBEX). Planet. Space Sci. 85, 232–242 (2013). https://doi.org/10.1016/j.pss.2013.06.014
M.J. Arts, D.S. Prinsloo, M. Ruiter, A.J. Boonstra, Design of a reconfigurable array of monopoles for the Netherlands China Low-frequency Explorer, in 2019 13th European Conference on Antennas and Propagation (EuCAP), Krakow, Poland (2019), pp. 1–5
S. Bandyopadhyay, J. Lazio, A. Stoica, P. Goldsmith, B. Blair, M. Quadrelli, J.P. de la Croix, A. Rahmani, Conceptual ideas for radio telescope on the far side of the Moon, in 2018 IEEE Aerospace Conference, Big Sky, MT, USA (2018), pp. 1–10. https://doi.org/10.1109/AERO.2018.8396801
J.P. Basart, J.O. Burns, A very low frequency array for the lunar far-side, in Lecture Notes in Physics, vol. 362 (1990), pp. 52–56. https://doi.org/10.1007/3-540-52891-1_107
P.-Y. Bely, R.J. Laurance, S. Volonte, R.R. Ambrosini, A. van Ardenne, C.H. Barrow, J.-L. Bougeret, J.-M. Marcaide, G. Woan, Very low frequency array on the lunar far side. Technical Report. ESA SCI (97).2 (1997)
A. Boonstra et al., Discovering the sky at the Longest Wavelengths (DSL), in 2016 IEEE Aerospace Conference, Big Sky, MT (2016), pp. 1–20. https://doi.org/10.1109/AERO.2016.7500678
J.O. Bums, N. Duric, S. Johnson, G.J. Taylor, A lunar far-side very low frequency array. NASA Conf. Publ. 3039 (1989)
J.O. Burns, J. Lazio, S. Bale, J. Bowman, R. Bradley, C. Carilli, S. Furlanetto, G. Harker, A. Loeb, J. Pritchard, Probing the first stars and black holes in the early universe with the Dark Ages Radio Explorer (DARE). Adv. Space Res. 49, 433–450 (2012). https://doi.org/10.1016/j.asr.2011.10.014
G.J. Feldman, R.D. Cousins, Unified approach to the classical statistical analysis of small signals. Phys. Rev. D 57(7), 3873–3889 (1998). https://doi.org/10.1103/PhysRevD.57.3873
Y. Futaana, S. Barabash, M. Wieser, M. Holmström, C. Lue, P. Wurz, A. Schaufelberger, A. Bhardwaj, M.B. Dhanya, K. Asamura, Empirical energy spectra of neutralized solar wind protons from the lunar regolith. J. Geophys. Res. 117, E05005 (2012). https://doi.org/10.1029/2011JE004019
J.W. Head, S. Murchie, J.F. Mustard, C.M. Pieters, G. Neukum, A. McEwen, R. Greeley, E. Nagel, M.J.S. Belton, Lunar impact basins: new data for the western limb and far side (Orientale and South Pole-Aitken Basins) from the first Galileo flyby. J. Geophys. Res., Planets 98, 17149–17181 (1993). https://doi.org/10.1029/93JE01278
X.Y. Hu, P. Ma, Y.Z. Yang, M.H. Zhu, T. Jiang, P.G. Lucey, L.Z. Sun, H. Zhang, C.L. Li, R. Xu, Z.P. He, H.Y. Lin, C.N. Huang, Y.X. Sun, Mineral abundances inferred from in situ reflectance measurements of Chang’E-4 landing site in South Pole-Aitken basin. Geophys. Res. Lett. 46, 9439–9447 (2019). https://doi.org/10.1029/2019GL084531
J. Huang, Z.Y. Xiao, J. Flahaut, M. Martinot, J.W. Head, X. Xiao, M.G. Xie, L. Xiao, Geological characteristic of Von Kármán crater, Northwestern South Pole Aitken basin: Chang’E 4 landing site region. J. Geophys. Res. 123, 1684–1700 (2018). https://doi.org/10.1029/2018JE005577
IAU WGPSN, Chang’e-4 Landing Site Name Approved: Statio Tianhe (Gazetteer of Planetary Nomenclature). https://astrogeology.usgs.gov/news/nomenclature/chang-e-4-landing-site-name-approved-statio-tianhe. Accessed 15 February 2019
S. Jester, H. Falcke, Science with a lunar low-frequency array: from the dark ages of the Universe to nearby exoplanets. New Astron. Rev. 53, 1–26 (2009). https://doi.org/10.1016/j.newar.2009.02.001
A. Khan, J.A.D. Connolly, A. Pommier, J. Noir, Geophysical evidence for melt in the deep lunar interior and implications for lunar evolution. J. Geophys. Res., Planets 119, 2197–2221 (2014). https://doi.org/10.1002/2014JE004661
C.L. Li, J.J. Liu, X. Ren, W. Zuo, X. Tan, W.B. Wen, H. Li, L.L. Mu, Y. Su, H.B. Zhang, J. Yan, Z.Y. Ouyang, The Chang’e 3 mission overview. Space Sci. Rev. 190, 85–101 (2015). https://doi.org/10.1007/s11214-014-0134-7
C.L. Li, D.W. Liu, B. Liu, X. Ren, J.J. Liu, Z.P. He, W. Zuo, X.G. Zeng, R. Xu, X. Tan, X.X. Zhang, W.L. Chen, R. Shu, W.B. Wen, Y. Su, H.B. Zhang, Chang’E-4 initial spectroscopic identification of lunar far-side mantle-derived materials. Nature 569, 378–382 (2019a). https://doi.org/10.1038/s41586-019-1189-0
C.L. Li, C. Wang, Y. Wei, Y.T. Lin, China’s present and future lunar exploration program. Science 365, 238–239 (2019b). https://doi.org/10.1126/science.aax9908
C.L. Li, Z.D. Wang, R. Xu, G. Lv, L.Y. Yuan, Z.P. He, J.Y. Wang, The scientific information model of Chang’e-4 Visible and Near-IR Imaging Spectrometer (VNIS) and in-flight verification. Sensors 19(12), 2806 (2019). https://doi.org/10.3390/s19122806
C.L. Li, Y. Su, E. Pettinelli, S.G. Xing, C.Y. Ding, J.J. Liu, X. Ren, S.E. Lauro, F. Soldovieri, X.G. Zeng, X.Y. Gao, W.L. Chen, S. Dai, D.W. Liu, G.L. Zhang, W. Zuo, W.B. Wen, Z.B. Zhang, X.X. Zhang, H.B. Zhang, The Moon’s farside shallow subsurface structure unveiled by Chang’E-4 Lunar Penetrating Radar. Sci. Adv. 6, 1–8 (2020). https://doi.org/10.1126/sciadv.aay6898
H.L. Lin, Z.P. He, W. Yang, Y.T. Lin, R. Xu, C. Zhang, M.H. Zhu, R. Chang, J.H. Zhang, C.L. Li, H.Y. Lin, Y. Liu, S. Gou, Y. Wei, S. Hu, C.B. Xue, J.F. Yang, J. Zhong, X.H. Fu, W.X. Wan, Y.L. Zou, Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA impact melt pool. Nat. Sci. Rev. 7(5), 913–920 (2019). https://doi.org/10.1093/nsr/nwz183.
Z.C. Ling, L. Qiao, C.Q. Liu, H.J. Cao, X.Y. Bi, X.J. Lu, J. Zhang, X.H. Fu, B. Li, J.Z. Liu, Composition, mineralogy and chronology of mare basalts and non-mare materials in Von Kármán crater: landing site of the Chang’E-4 mission. Planet. Space Sci. 179, 104741 (2019). https://doi.org/10.1016/j.pss.2019.104741
J.J. Liu, X. Ren, W. Yan, C.L. Li, H. Zhang, Y. Jia, X.G. Zeng, W.L. Chen, X.G. Zeng, X.Y. Gao, D.W. Liu, X. Tan, X.X. Zhang, T. Ni, H.B. Zhang, W. Zuo, Y. Su, W.B. Wen, Descent trajectory reconstruction and landing site positioning of Chang’E-4 on the lunar farside. Nat. Commun. 10(4229), 1–10 (2019). https://doi.org/10.1038/s41467-019-12278-3
J.E. Mazur, W.R. Crain, M.D. Looper, D.J. Mabry, J.B. Blake, A.W. Case, M.J. Golightly, J.C. Kasper, H.E. Spence, New measurements of total ionizing dose in the lunar environment. Space Weather 9, S07002 (2011). https://doi.org/10.1029/2010SW000641
D.J. McComas, F. Allegrini, P. Bochsler, P. Frisch, H.O. Funsten, M. Gruntman, P.H. Janzen, H. Kucharek, E. Möbius, D.B. Reisenfeld, N.A. Schwadron, Lunar backscatter and neutralization of the solar wind: first observations of neutral atoms from the moon. Geophys. Res. Lett. 36, L12104 (2009). https://doi.org/10.1029/2009GL038794
K. Miljković, M.A. Wieczorek, G.S. Collins, M. Laneuville, G.A. Neumann, H.J. Melosh, S.C. Solomon, R.J. Phillips, D.E. Smith, M.T. Zuber, Asymmetric distribution of lunar impact basins caused by variations in target properties. Science 342, 724–726 (2013). https://doi.org/10.1126/science.1243224
K. Pahlevan, D.J. Stevenson, Equilibration in the aftermath of the lunar forming giant impact. Earth Planet. Sci. Lett. 262, 438–449 (2007). https://doi.org/10.1016/j.epsl.2007.07.055
N.E. Petro, C.M. Pieters, Surviving the heavy bombardment: ancient material at the surface of South Pole-Aitken basin. J. Geophys. Res. 109, E06004 (2004). https://doi.org/10.1029/2003JE002182
C.M. Pieters, S. Tompkins l, J.W. Head, P.C. Hes, Mineralogy of the mafic anomaly in the South Pole-Aitken basin: implications for excavation of the lunar mantle. Geophys. Res. Lett. 24, 1903–1906 (1997). https://doi.org/10.1029/97GL01718
G. Reitz, T. Berger, D. Matthiae, Radiation exposure in the moon environment. Planet. Space Sci. 74, 78–83 (2012). https://doi.org/10.1016/j.pss.2012.07.014
A.E. Ringwood, Origin of the Earth and Moon (Springer, New York, 1979), pp. 198–228
D.J. Stevenson, Lunar asymmetry and palaeomagnetism. Nature 287, 520–521 (1980). https://doi.org/10.1038/287520a0
Z.Z. Sun, H. Zhang, X.Y. Wu, F. Li, M. Yang, M. Cheng, Y.Q. Xu, Y.W. Zhang, Flight results of Chang’E-4 lander summary and evaluation. Sci. Sin. Technol. 49, 1397–1407 (2019). https://doi.org/10.1360/SST-2019-0106. (In Chinese)
Y.D. Takahashi, A concept for a simple radio observatory at the lunar South pole. Adv. Space Res. 31, 2473–2478 (2003). https://doi.org/10.1016/S0273-1177(03)00540-4
W.M. Vaughan, J.W. Head, Impact melt differentiation in the South Pole-Aitken basin: some observations and speculations. Planet. Space Sci. 91, 101–106 (2014). https://doi.org/10.1016/j.pss.2013.11.010
P.H. Warren, The magma ocean concept and lunar evolution. Annu. Rev. Earth Planet. Sci. 13, 201–240 (1985). https://www.annualreviews.org/doi/pdf/10.1146/annurev.ea.13.050185.001221
M. Wieser, S. Barabash, Y. Futaana, M. Holmström, A. Bhardwaj, R. Sridharan, M.B. Dhanya, A. Schaufelberger, P. Wurz, First observation of a mini-magnetosphere above a lunar magneticanomaly using energetic neutral atoms. Geophys. Res. Lett. 37, L05103 (2010). https://doi.org/10.1029/2009GL041721
M. Wieser, S. Barabash, X.D. Wang, C. Lue, A.B. Zhang, C. Wang, W.J. Wang, Solar wind interaction with the lunar surface: observations by the advanced small analyzer for neutrals on the rover of Chang’E-4, in EGU General Assembly 2019 vol. 13 (2019). EPSC-DPS2019-808-1
M. Wieser, S. Barabash, X.D. Wang, A.B. Zhang, C. Wang, W.J. Wang, Solar wind interaction with the lunar surface: observation of energetic neutral atoms on the lunar surface by the Advanced Small Analyzer for Neutrals (ASAN) instrument on the Yutu-2 rover of Chang’E-4. EGU General Assembly (2020). https://doi.org/10.5194/egusphere-egu2020-9199
D.E. Wilhelms, J.F. McCauley, N.J. Trask, The geologic history of the Moon. Technical Report. USGS professional paper 1348, 245 (1987)
R.F. Wimmer-Schweingruber, S.Y. Zhang, J. Yu, S.I. Böttcher, S. Burmeister, H. Lohf, B. Yuan, G.H. Shen, C. Wang, J.N. Guo, Z.G. Xu, T. Berger, C. Hellweg, D. Matthiäe, First results from the Lunar Lander Neutron and Dosimetry experiment (LND) on China’s Chang’E 4 mission to the far side of the Moon, in 2019 EPSC-DPS Joint Meeting, vol. 13 (2019). EPSC-DPS2019-1289-1
R.F. Wimmer-Schweingruber, J. Yu, S.I. Böttcher, S.Y. Zhang, S. Burmeister, H. Lohf, J.N. Guo, Z.G. Xu, B. Schuster, L. Seimetz, J.F.V. Forstner, A. Ravanbakhsh, V. Knierim, S. Kolbe, H. Woyciechowsky, S.R. Kulkarni, B. Yuan, G.H. Shen, C.Q. Wang, Z. Chang, T. Berger, C.E. Hellweg, D. Matthiä, D.H. Hou, A. Knappmann, C. Büschel, X.F. Hou, B.G. Ren, Q. Fu, The Lunar Lander Neutron and Dosimetry (LND) experiment on Chang’E 4. Space Sci. Rev. 216, 104 (2020). https://doi.org/10.1007/s11214-020-00725-3
J.A. Wood, Bombardment as a cause of the lunar asymmetry. Moon 8, 73–103 (1973). https://doi.org/10.1007/BF00562751
W.R. Wu, Q. Wang, Y.H. Tang, G.B. Yu, J.Z. Liu, W. Zhang, Y.M. Ning, L.L. Lu, Design of Chang’E-4 lunar farside soft-landing mission. J. Deep Space Explor. 4(2), 111–117 (2017). https://doi.org/10.15982/j.issn.2095-7777.2017.02.002. (In Chinese)
W.R. Wu, C.L. Li, W. Zuo, H.B. Zhang, J.J. Liu, W.B. Wen, Y. Su, X. Ren, J. Yan, D.Y. Yu, G.L. Dong, C. Wang, Z.Z. Sun, E.H. Liu, J.F. Yang, Z.Y. Ouyang, Lunar farside to be explored by Chang’e-4. Nat. Geosci. 12, 222–223 (2019). https://doi.org/10.1038/s41561-019-0341-7
P. Wurz, S.A. Fuselier, E. Möbius, H.O. Funsten, P.C. Brandt, F. Allegrini, A.G. Ghielmetti, R. Harper, E. Hertzberg, P. Janzen, H. Kucharek, D.J. McComas, E.C. Roelof, L. Saul, J. Scheer, M. Wieser, Y. Zheng, IBEX backgrounds and signal-to-noise ratio. Space Sci. Rev. 146, 173 (2009). https://doi.org/10.1007/s11214-009-9515-8
L. Xiao, China’s touch on the Moon. Nat. Geosci. 7, 391–392 (2014). https://doi.org/10.1038/ngeo2175
P.J. Ye, Z.Z. Sun, H. Zhang, F. Li, An overview of the mission and technical characteristics of Change’4 Lunar Probe. Sci. China, Technol. Sci. 60, 658–667 (2017). https://doi.org/10.1007/s11431-016-9034-6
P.J. Ye, Z.Z. Sun, H. Zhang, L.H. Zhang, X.Y. Wu, F. Li, Mission design of Chang’e-4 probe system. Sci. Sin. Technol. 49, 124–137 (2019). https://doi.org/10.1360/N092018-00400. (In Chinese)
S.Y. Zhang, R.F. Wimmer-Schweingruber, J. Yu, C. Wang, Q. Fu, Y.L. Zou, Y.Q. Sun, C.Q. Wang, D.H. Hou, S.I. Böttcher, S. Burmeister, L. Seimetz, B. Schuster, V. Knierim, G.H. Shen, B. Yuan, H. Lohf, J.N. Guo, Z.G. Xu, J.L. Freiherr von Forstner, S.R. Kulkarni, H.T. Xu, C.B. Xue, J. Li, Z. Zhang, H. Zhang, T. Berger, D. Matthiä, C.E. Hellweg, X.F. Hou, J.B. Cao, Z. Chan, B.Q. Zhang, Y.S. Chen, H. Geng, Z.D. Quan, First measurements of the radiation dose on the lunar surface. Sci. Adv. 6, eaaz1334 (2020a). https://doi.org/10.1126/sciadv.aaz1334
A.B. Zhang, M. Wieser, C. Wang, S. Barabash, W.J. Wang, X.D. Wang, Y.L. Zou, L. Li, J.B. Cao, L. Kalla, L. Dai, J. Svensson, L.G. Kong, M. Oja, B. Liu, V. Alatalo, Y.T. Zhang, J. Talonen, Y.Q. Sun, M. Emanuelsson, C.B. Xue, L. Wang, F. Wang, W.L. Liu, Emission of energetic neutral atoms measured on the lunar surface by Chang’E-4. Planet. Space Sci. 189, 104970 (2020b). https://doi.org/10.1016/j.pss.2020.104970
Acknowledgements
This research was supported by the Chang’E-4 mission of the Chinese Lunar Exploration Program (CLEP) and the National Natural Science Foundation of China (No.41671458). We thank the team members of the Ground Research and Application System (GRAS), who have contributed to data receiving, preprocessing, management and release.
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C.L.L, W.Z., and W.W.B. designed the work, performed data analysis, and wrote the manuscript. X.G.Z., X.Y.G, Y.X.L., Q.F., Y.S., X.R., F.W., D.W.L., B.L., and Z.Y. OY processed and analyzed the payload data. Z.B.Z., J.J.L., W.Y., X.T., and H.B.Z. contributed to data receiving, data preprocessing, data management, and instrument operations.
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Li, C., Zuo, W., Wen, W. et al. Overview of the Chang’e-4 Mission: Opening the Frontier of Scientific Exploration of the Lunar Far Side. Space Sci Rev 217, 35 (2021). https://doi.org/10.1007/s11214-021-00793-z
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DOI: https://doi.org/10.1007/s11214-021-00793-z