Secchi (lunar crater)

Secchi

Apollo 15 mapping camera image
Coordinates	2°24′N 43°30′E / 2.4°N 43.5°E / 2.4; 43.5Coordinates: 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	P. Angelo Secchi

Secchi is a small lunar crater formation on the northwest edge of Mare Fecunditatis. 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.

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.

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