Secchi (lunar crater)
Secchi is a small lunar impact crater formation on the northwest edge of Mare Fecunditatis. It was named after the 19th-century Italian astronomer Angelo Secchi.[1] To the northeast is the crater Taruntius. The western rim is joined with a section of the minor Montes Secchi range. The rim of this crater has been opened in the northern and southern ends, leaving two curved ridges facing each other across the crater floor. To the south is a pair of rilles designated the Rimae Secchi. These lie near the edge of the mare, and have a combined length of about 40 kilometers.
 Apollo 15 mapping camera image | |
| Coordinates | 2.4°N 43.5°E |
|---|---|
| Diameter | 25 km |
| Depth | 1.9 km |
| Colongitude | 317° at sunrise |
| Eponym | Angelo Secchi |
Northeastern Secchi at low sun angle, from Apollo 11
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Secchi.
| Secchi | Coordinates | Diameter, km |
|---|---|---|
| A | 3.26°N 41.47°E | 4.9 |
| B | 3.66°N 41.52°E | 5.2 |
| G | 3.94°N 44.57°E | 6.7 |
| K | 0.17°S 45.5°E | 6.0 |
| U | 1.08°N 42.19°E | 4.9 |
| X | 0.77°S 43.67°E | 4.7 |
Oblique view of Rima Messier from Lunar Orbiter 5, also showing Secchi X above center and Secchi K at lower right.jpg.webp)
Oblique view of Secchi K satellite crater by Apollo 10. The double ray of Messier A crater is visible in the upper left.
Satellite craters of Secchi
References
- "Secchi (lunar crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
- Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
- 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.
- Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 978-0-304-35469-6.
- Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
- Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
- 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.
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