Secchi (lunar crater)

Secchi
	Apollo 15 mapping camera image
Coordinates	2°24′N 43°30′E / 2.4°N 43.5°E
Diameter	25 km
Depth	1.9 km
Colongitude	317° at sunrise
Eponym	Angelo Secchi

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.

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°16′N 41°28′E / 3.26°N 41.47°E / 3.26; 41.47 (Secchi A)	4.9
B	3°40′N 41°31′E / 3.66°N 41.52°E / 3.66; 41.52 (Secchi B)	5.2
G	3°56′N 44°34′E / 3.94°N 44.57°E / 3.94; 44.57 (Secchi G)	6.7
K	0°10′S 45°30′E / 0.17°S 45.5°E / -0.17; 45.5 (Secchi K)	6.0
U	1°05′N 42°11′E / 1.08°N 42.19°E / 1.08; 42.19 (Secchi U)	4.9
X	0°46′S 43°40′E / 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

^ "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.
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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.

[1] "Secchi (lunar crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.

[1]

Apollo 15 mapping camera image
Coordinates	2°24′N 43°30′E / 2.4°N 43.5°E / 2.4; 43.5
Diameter	25 km
Depth	1.9 km
Colongitude	317° at sunrise
Eponym	Angelo Secchi