| Coordinates: | -36.1°N -151.8°W |
| Diameter: | 537 km[1] |
| Colong: | 161 |
| Eponym: | Project Apollo |
Apollo, also called the Apollo basin, is an enormous impact crater located in the southern hemisphere on the far side of the Moon. This formation dwarfs the large crater Oppenheimer that is located next to the western rim. The crater Barringer lies across the northern wall. To the southeast is the crater Anders, and Kleymenov is just to the east of the rim.
Apollo is a double-ringed walled plain (or basin) whose inner ring is roughly half the diameter of the outer wall. Both the outer wall and the interior have been heavily worn and eroded by subsequent impacts, so that significant parts of the outer and inner walls now consist of irregular and incised sections of mountainous arcs.
The interior floor is covered in a multitude of craters of various sizes, some of which have been named for people associated with the Apollo program or other NASA projects.
Sections of Apollo's interior have been resurfaced with lava, leaving patches of the floor with a lower albedo than the surroundings. There is a large patch of this lunar mare in the middle part of the inner ring, which contains some ray system markings. A long stretch of the mare lies along the southern part of the crater. There is also a smaller section near the western rim.
Prior to formal naming in 1970 by the IAU,[2] the crater was known as Basin XVI.[3]
Three craters are named after the crew of Apollo 8. In the southeast part of Apollo is Borman crater, named after commander Frank Borman. Near the southeastern margin of Apollo is Anders crater, named after William Anders. On the eastern margin is Lovell crater, named after Jim Lovell.
Many craters within and adjacent to the Apollo impact have been named to honor deceased NASA employees.
Dryden is attached to the west-northwestern exterior of the inner ring. Chaffee is a similar-sized crater that lies partly across the southwest section of the inner ring. Inside the inner ring are the craters Resnik, McAuliffe and Onizuka, and the Jarvis–McNair crater pair. The crater Smith lies across the northern part of the inner ring.
In 2006 the IAU approved a proposal to name seven interior craters to honor the astronauts killed in the Space Shuttle Columbia disaster.[4] [5]
| Crater | Coordinates | Diameter | Name source | |
|---|---|---|---|---|
| Chawla | -42.8°N -147.5°W | 15 km | Kalpana Chawla | |
| D. Brown | -42°N -147.2°W | 15 km | David McD. Brown | |
| Husband | -40.8°N -147.9°W | 29 km | Richard D. Husband | |
| L. Clark | -43.7°N -147.7°W | 16 km | Laurel B. S. Clark | |
| McCool | -41.7°N -146.3°W | 21 km | William C. McCool | |
| M. Anderson | -41.6°N -149°W | 17 km | Michael P. Anderson | |
| Ramon | -41.6°N -148.1°W | 17 km | Ilan Ramon |
Three of the crater names include the respective astronaut's first initials to distinguish them from the existing craters called Anderson, Brown and Clark.
China launched the Chang'e 6 robotic mission on 3 May 2024, which seeks to return the first lunar sample from the Apollo Basin on the far side of the Moon.[6] This is China's second lunar sample return mission, the first was the Chang'e 5 mission that returned lunar samples from the near side of the Moon four years earlier.[7] The Chang'e 6 lander also carried a rover named Yidong Xiangji which conducted infrared spectroscopy of the landing site and imaged the Chang'e 6 lander on the lunar surface.[8] The lander-ascender-rover combination separated from the orbiter and returner before landing in the southern mare of the Apollo basin on 1 June 2024 at 22:23 UTC; its precise landing location is near lunar coordinates [9] [10] [11] [12] After the probe collected far-side regolith samples and placed it on the ascender, the latter probe segment launched back into lunar orbit on 3 June 2024 at 23:38 UTC. The ascender docked with the Chang'e 6 service module (the orbiter) in lunar orbit at 06:48 UTC on 6 June 2024 and subsequently completed the transfer of the sample container to the Earth return module at 07:24 UTC on the same day.[13] The orbiter left lunar orbit on 20 June 2024 with the atmospheric re-entry module that landed in Inner Mongolia with the collected samples on 25 June 2024.