Ross (lunar crater)

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Ross crater 4085 h2.jpg
Coordinates 11°42′N 21°42′E / 11.7°N 21.7°E / 11.7; 21.7Coordinates: 11°42′N 21°42′E / 11.7°N 21.7°E / 11.7; 21.7
Diameter 24 km
Depth 1.8 km
Colongitude 338° at sunrise
Eponym James C. Ross
Frank E. Ross

Ross is a lunar impact crater that is located in the northwest part of the Mare Tranquillitatis. It lies more than 90 km south-southwest of the crater Plinius, and more than 35 km northeast of the lava-flooded Maclear, also it is further east to the smaller Carrel crater. Further south is the faded crater known as Lamont located about 130 km south, the distance apart between Lamont and Ross craters of Mars is nearly the same with the two on the Moon.

This crater has a generally circular shape, but is not quite symmetrical. The inner walls slope down to a base of slumped material, before joining a relatively level interior floor. There is a low ridge to the west of the crater midpoint.

Ross crater and its satellite craters taken from Earth in 2012 at the University of Hertfordshire's Bayfordbury Observatory with the telescopes Meade LX200 14" and Lumenera Skynyx 2-1


The crater are named after both James Clark (British explorer) and Frank E. Ross (American explorer and optician). It was the location that earlier lunar cartographers had given the feature different names. Michael van Langren's 1645 map calls it "Fromondii" after a Fromond of the early 17th century.[1][2] And Johannes Hevelius called it "Apollonia Minor" of the ancient world.[3][4] When other lunar craters and other features were named by Giovanni Riccioli in 1651, the crater would be left unnamed for a few centuries.

Satellite craters[edit]

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Ross. Satellite craters B and C are in the northwest, D in the northeast, E, F and G in the southeast and H in the south.

Oblique view facing south from Apollo 15
Cross sections of Ross crater with different elevations of each direction. The elevations were of the 1960s as the modern elevation numbers are different today
Ross Latitude Longitude Diameter
B 11.4° N 20.2° E 6 km
C 11.7° N 19.0° E 5 km
D 12.6° N 23.3° E 9 km
E 11.1° N 23.4° E 4 km
F 10.9° N 24.2° E 5 km
G 10.7° N 24.9° E 5 km
H 10.2° N 21.8° E 5 km


  1. ^ Ewen A. Whitaker, Mapping and Naming the Moon (Cambridge University Press, 1999).
  2. ^ Langrenus map of the Moon (1645)
  3. ^ Ewen A. Whitaker, Mapping and Naming the Moon (Cambridge University Press, 1999), p. 204.
  4. ^ Hevelius map of the Moon (1647)


External links[edit]