Secchi (lunar crater)

This article is about the crater on the Moon. For the crater on Mars, see Secchi (Martian crater).

Secchi

Apollo 15 mapping camera image
Coordinates	2.4°N 43.5°E / 2.4; 43.5
Diameter	25 km
Depth	1.9 km
Colongitude	317° at sunrise
Eponym	Angelo Secchi

Northeastern Secchi at low sun angle, from Apollo 11

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. 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.

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 / 3.26; 41.47 (Secchi A)	4.9
B	3.66°N 41.52°E / 3.66; 41.52 (Secchi B)	5.2
G	3.94°N 44.57°E / 3.94; 44.57 (Secchi G)	6.7
K	0.17°S 45.5°E / -0.17; 45.5 (Secchi K)	6.0
U	1.08°N 42.19°E / 1.08; 42.19 (Secchi U)	4.9
X	0.77°S 43.67°E / -0.77; 43.67 (Secchi X)	4.7

• 
  Oblique view of Rima Messier from Lunar Orbiter 5, also showing Secchi X above center and Secchi K at lower right
• 
  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

• 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.