Lunar Orbiter IV-168-h2
Partially seen in this frame is the rim of a large unnamed crater which is surrounding the much smaller dark crater Cruger in an eccentric way.
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Concentric Crater number 42 in C.A.Wood's list (published in 1978) must be one of the tiny craterlets between Cruger and Cruger E east-southeast of it. On the Hi-Res scan of Lunar Orbiter 4's photograph LOIV-168-h2 there is indeed something noticeable which looks like a Concentric Crater (immediately east of Cruger). See: LOIV-168-h2, near the frame's lower right corner.
Research: Danny Caes
(IAU Directions) CRUGER.--A regular ring-plain W. of Fontana, 30 miles in diameter, with a dark floor, without detail, and comparatively low bright walls. There is a smaller but very conspicuous ring-plain (Cruger a) on the E. of it, to which runs a branch of the great Sirsalis cleft.
- Depth data from Kurt Fisher database
- Westfall, 2000: 0.53 km
- Viscardy, 1985: 0.49 km
- Cherrington, 1969: 1 km
- Four small pyroclastic deposits (area = 5, 50, 120 & 760 km^2). Gaddis, L. (1999) Lunar Pyroclastic Volcanism Project.
- Crüger G, an 8 km crater SW of Crüger, has excavated thru Orientale ejecta and brought up anorthosite. (Hawke et al (1988) Remote Sensing Studies of the Crüger Region of the Moon, LPSC 19.
- Concentric Crater immediately east of Cruger (which is number 42 in C.A.Wood's list of Concentric Craters, published in 1978).
Peter Crüger or Krüger (1580—1639) was a mathematician, astronomer and polymath. Krüger published treatises on many scientific subjects and contributed to the progress of trigonometry, geography and astronomy, also with the development of astronomical instruments.
L52: Possible volcanic caldera.
Wood, C.A. 7/2006. False Volcanoes on the Moon. S&T 112:(1):66-67