Mission overview and key technologies of the first Mars probe of China

Ye, PeiJian; Sun, Zheng; Rao, Wei; Meng, Liang

doi:10.1007/s11431-016-9035-5

Cited by 57 publications

(36 citation statements)

References 4 publications

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“…Tianwen‐1 mission can be divided into five stages (Ye et al, 2017), which are Earth‐Mars transfer (approximately 7 months), Mars orbit insertion (approximately 10 days), Mars orbit parking (approximately 2–3 months), Deorbit and landing (approximately 5 hours), and scientific exploration (approximately one Martian year). Tianwen‐1 blasted off from China's Wenchang Space Launch Center on July 23, 2020, its EDL season is about April–June 2021 (MY 36, Ls = 25.1–65.4°).…”

Section: Spatial‐temporal Safety Evaluation For Tianwen‐1 Landing Mismentioning

confidence: 99%

“…Landing area selection is important for Tianwen‐1 mission; it will not only affect the orbit design but also influence the parameters of the landing/roving probe (Ye et al, 2017). Based on the engineering constraints for landing site selection described by Golombek et al (2012), we listed these important parameters for selecting safe landing areas in Table 1.…”

Section: Spatial‐temporal Safety Evaluation For Tianwen‐1 Landing Mismentioning

confidence: 99%

“…The first China's Mars exploration mission (Tianwen‐1), launched on July 23, 2020, will achieve the targets of “orbiting, landing, and roving.” Based on the criteria of latitude, geographic elevation, topographic slope, coverage of dust, distribution of rocks, local wind speed, and visibility requirements during the landing process, there are two TLAs in the latitude range of 5–30° selected for this mission (Ye et al, 2017), as shown in Figure 1. Chryse Planitia (TLA 1) is an important origination area of dust storm sequences in the northern hemisphere of Mars (Wang & Richardson, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the Dust Storm Probability in Isidis‐Elysium Planitia, a Tentative Landing Area of China's First Mars Mission (Tianwen‐1)

Yao

Wang

et al. 2020

Earth and Space Science

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China's first Mars exploration mission (Tianwen‐1), launched on July 23, 2020 with the goal of “orbiting, landing, and roving,” and its tentative landing areas (TLAs) are Chryse Planitia (TLA 1) and Isidis‐Elysium Planitia (TLA 2). Dust storm is a typical activity on Mars; it has strong interaction with atmospheric circulation and will influence the visibility of the Martian surface. To ensure the safety and accuracy for landing, it is meaningful to analyze the probability of dust storm activity during Entry‐Descent‐Landing (EDL) season in TLAs. First, based on Mars Orbiter Camera (MOC) and Mars Color Imager (MARCI) Daily Global Maps (MDGMs) from Mars Years 24–31, we identified 882 dust storms within the 2,000 km radius monitor circle of TLA 2 (short for TLA 2‐C). Second, the average daily probability of dust storm activity (Adp_ds) in TLA 2‐C was calculated, with a range of 0% to 14.13% showing obvious seasonality and discontinuity. Third, we divided TLA 2‐C into 0.5° longitude × 0.5° latitude square grids and calculated their spatial probability of dust storm activity. The spatial probability of dust storm in TLA 2‐C ranged from 0% to 11.87% and generally reduced from north to south. Finally, according to the temporal and spatial dust storm probability in TLA 2 during EDL season, we suggested the optimal landing time of China's Tianwen‐1 mission was in Ls = 20–41° and selected five preferred landing areas with the spatial probability of dust storm <3% for this mission.

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Section: Spatial‐temporal Safety Evaluation For Tianwen‐1 Landing Mismentioning

confidence: 99%

Section: Spatial‐temporal Safety Evaluation For Tianwen‐1 Landing Mismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluating the Dust Storm Probability in Isidis‐Elysium Planitia, a Tentative Landing Area of China's First Mars Mission (Tianwen‐1)

Yao

Wang

et al. 2020

Earth and Space Science

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“…Tianwen-1 mission is consisted of ve phases (Ye et al, 2017) Tianwen-1 and NASA Mars missions in 2020 have the homologous launch window. Assuming that Tianwen-1 will be launched in July 2020, the same time as NASA's Mars 2020, the EDL season of China's Mars mission is about April June 2021 (MY 36,, which is different from that of NASA's Mars 2020 (Ls=345°-25°).…”

Section: Dust Storm Probability During the Edl Seasonmentioning

confidence: 99%

“…The China's rst Mars probe mission (Tianwen-1) was launched in 2020 with the goals of "orbiting, landing and roving" (Ye et al, 2017). It will carry out detailed investigations of landing areas by rover patrolling exploration with a high accuracy and resolution.…”

Section: Introductionmentioning

confidence: 99%

Dust storm activity in Tianwen-1 mission’s tentative landing area (Chryse) ： MGS-MOC observations from Mars year 24-28

Yao

Zhang

et al. 2020

Preprint

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Dust storms, observed in all seasons, are among the most momentous Mars atmosphere activities. The Entry-Descent-Landing (EDL) activity of a Martian landing mission is influenced by local atmospheric conditions, especially the dust storm activity probability. It is of great significance to know well the dust storm situation that China's first Mars mission (Tianwen-1) may encounter in EDL season in the Chryse landing area, one of the tentative landing areas. Firstly, based on four Martian years’ Mars Orbiter Camera (MOC) Mars Daily Global Maps (MDGMs), 1172 dust storms were identified within Chryse’s 1600 km radius ring with their shape parameters extracted, including center, range and area. Secondly, the daily mean dust storm probability was calculated binned by 1° of solar longitude in the Chryse landing area during EDL season. Dust storm activity frequency was closely interrelated with the seasonal ebb and flow of the arctic polar ice cap, consequently, most of dust storms occurring in either the cap’s grow or the recession phase. The dust storm activity in the Chryse landing area mainly came from the northern polar cap region, Acidalia and Chryse, with some contribution from the southern hemisphere (Argyre and Bosporos) northward. Thirdly, we divided the Chryse landing area into many square grids of 0.5° and computed the average occurrence probability of dust storm in each grid during EDL season. The dust storm activity probability in space was also in-homogeneous, low in the west and south but high in the east and north, which was mainly affected by the origin and the path of dust storm sequence. Finally, according to the temporal and spatial probability of dust storm activity in the Chryse landing area during EDL season, we held that the preferred landing time of the Tianwen-1 mission in 2021 was in Ls=18°-65° and three preferred landing areas were selected with low dust storm probability.

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