| 词条 | The Helmet (Oceanus Procellarum) |
| 释义 |
The Helmet is an informal term for a highland mass within southern Oceanus Procellarum on the near side of the Moon, southeast of the crater Herigonius. The astronauts of Apollo 16 used the term to refer to the feature during the mission.[1] The name derives from the roughly semicircular shape of the border of the feature, resembling a helmet. The feature is topographically higher and of a higher albedo than the surrounding mare lava plain. Two mountains within The Helmet are informally named Herigonius Eta (η) and Herigonius Pi (π). Eta is the larger mountain on the northern edge of the Helmet, and Pi is along the southwest edge. The selenographic coordinates of this feature are 16.8° S, 31.6° W. External links
References1. ^Apollo 16 Preliminary Science Report (NASA SP-315), 1972. Chapter 28, Observations and Impressions from Lunar Orbit. [https://www.hq.nasa.gov/alsj/a16/a16psr.html PDF file] {{DEFAULTSORT:Helmet}}{{moon-stub}} 1 : Geological features on the Moon |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。