| Names | Inner SOlar system CHRONogy |
|---|---|
| Mission type | Lunar sample-return |
| Operator | NASA |
| Start of mission | |
| Launch date | 2025 (proposed)[1] |
| Moon lander | |
| Landing site | South of Aristarchus plateau[1][2] |
| Sample mass | 150 g (5.3 oz)[1] |
ISOCHRON (Inner SOlar system CHRONogy) is a proposed lunar sample-return mission that would retrieve samples of the youngest lunar mare basalt.
This robotic mission was proposed in July 2019 to NASA's Discovery Program.[1][2] It was not shortlisted.
Overview
ISOCHRON would address fundamental questions about the composition of the lunar crust and the time-stratigraphy of lunar volcanic processes, with implications for all of the terrestrial planets.[2] There is a stretch of nearly 2 billion years of lunar history that planetary scientists have not been able to date because the Apollo missions did not retrieve any young rocks.[1] Lunar mare basalts formed through partial melting of the mantle, thus serve as probes of the structure and composition of the interior.[2] The stated scientific objective of the mission is: "[To] make high-precision radiometric age measurements on these relatively young basalts to fill the existing gap in age-correlated crater size-frequency distributions (CSFDs), thereby greatly improving this widely-used tool for estimating the ages of exposed surfaces on rocky bodies."[2]
The proposed ISOCHRON mission concept would have a robotic lander land just south of Aristarchus plateau and retrieve about 150 g (5.3 oz) of a basalt sample estimated to be 1.5 to 2.0 billion years old.[2] The sample would be placed in a small container, launched to Earth, and it would be curated at NASA's Lunar Sample Laboratory Facility.
The Principal Investigator is Dave Draper, at NASA's Johnson Space Center in Texas.[1]
Location
The sample would be obtained from the Aristarchus plateau, located in the midst of the Oceanus Procellarum, a large expanse of lunar mare. This is a tilted crustal block, about 200 km across, that rises to a maximum elevation of 2 km above the mare in the southeastern section.[3]
See also
References
- 1 2 3 4 5 6 Meghan Bartels (March 25, 2019) NASA Needs Fresh Moon Rocks. This Sample-Return Mission Could Get Them. Space.
- 1 2 3 4 5 6 D. S. Draper, R. L. Klima, S. J. Lawrenc1, B. W. Denevi, and the ISOCHRON Team (2019). "The Inner Solar System Chronology (ISOCHRON) Discovery Mission: Returning Samples of the Youngest Lunar Mare Basalts" (PDF). 50th Annual Lunar and Planetary Science Conference. 50th Lunar and Planetary Science Conference (2132): 1110. Bibcode:2019LPI....50.1110D.
{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) Poster - ↑ "Aristarchus Region: Multispectral Mosaic of the Aristarchus Crater and Plateau". Lunar and Planetary Institute. Retrieved 2006-08-08.
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