O'Day (crater)

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O'Day
O'Day crater 2075 h3.jpg
Coordinates 30°36′S157°30′E / 30.6°S 157.5°E / -30.6; 157.5 Coordinates: 30°36′S157°30′E / 30.6°S 157.5°E / -30.6; 157.5
Diameter 71 km
Depth Unknown
Colongitude 203° at sunrise
Eponym Marcus O'Day
Oblique view from Apollo 17 O'Day crater AS17-M-1559.jpg
Oblique view from Apollo 17
Map of O'Day crater O'Day lunar crater.jpg
Map of O'Day crater

O'Day is a prominent lunar impact crater that is located on the far side of the Moon. It intrudes into the northwestern edge of Mare Ingenii, and the rim is lower on that side. To the northwest is the crater pair of Holetschek and Sierpinski. Southwest of O'Day lies the crater Seidel. It is named in honour of the American physicist Marcus O'Day.

Contents

The crater rim of O'Day remains sharp-edged, and the inner wall is terraced, especially in the northwestern half away from the mare. A small crater lies across the southern rim, and a tiny craterlet is located in the low inner rim between the crater and the mare. The floor is rough and irregular, with a double-peak at the midpoint.

Due to its prominent rays, O'Day is mapped as part of the Copernican System. [1]

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 O'Day.

O'DayLatitudeLongitudeDiameter
B29.1° S158.0° E16 km
M31.7° S157.1° E16 km
T30.4° S154.4° E24 km

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References

  1. The geologic history of the Moon, 1987, Wilhelms, Don E.; with sections by McCauley, John F.; Trask, Newell J. USGS Professional Paper: 1348. Plate 11: Copernican System (online)