St. John is an eroded lunar impact crater on the Moon's far side. This crater is situated to the northeast of the huge walled plain Mendeleev, and southwest of the crater Kohlschütter. To the east of St. John is the small crater Mills.
 Lunar Reconnaissance Orbiter image. | |
| Coordinates | 10°12′N 150°12′E / 10.2°N 150.2°E |
|---|---|
| Diameter | 68 km |
| Depth | Unknown |
| Colongitude | 187° at sunrise |
| Eponym | Charles E. St. John |
This is a heavily worn and eroded crater formation that is now little more than an uneven depression in the surface. It is scarcely distinguishable from the surrounding terrain, except from the shadows cast by the outer rim. The interior floor is uneven and marked by a chain of three small craterlets near the midpoint.
The crater is named after Charles Edward St. John, an American astronomer.
Satellite craters
editBy convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to St. John.
| St. John | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 12.4° N | 150.5° E | 16 km |
| M | 7.5° N | 150.1° E | 16 km |
| W | 12.6° N | 147.0° E | 18 km |
| X | 13.9° N | 147.4° E | 30 km |
| Y | 13.8° N | 149.0° E | 21 km |
References
edit- Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
- Blue, Jennifer (July 25, 2007). "Gazetteer of Planetary Nomenclature". USGS. Retrieved 2007-08-05.
- Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.
- Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 978-0-936389-27-1.
- McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24.
- Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186. Bibcode:1971SSRv...12..136M. doi:10.1007/BF00171763. S2CID 122125855.
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- Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revised ed.). Dover. ISBN 978-0-486-20917-3.
- Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6.
- Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.