Crater Classification

From The Moon
Jump to: navigation, search


(glossary entry)

In the unpublished catalog

Wood, C.A. and Andersson, L.E. (1978) Lunar & Planetary Laboratory Catalog of Lunar Craters: Part 1: Nearside. NASA TM 79328 (in press)

every crater was classified according to its morphology. This had rarely been attempted before and the LPL Catalog offered valuable new information. Fresh craters were classified into 5 different morphologies:

  • ALC- bowl-shaped craters with smooth rims, diameters up to 20 km; prototype Albategnius C
  • BIO - flat-floored craters with similar morphology and diameter range as ALC but with a flat floor having a clear break in slope at the contact with the crater wall; prototype Biot
  • SOS - relatively shallow craters with broad flat floors and terrace-free narrow walls, diameters 5-35 km; prototype Sosigenes
  • TRI - scalloped-walled craters typically 15-50 km in diameter, with sub-angular or scalloped outline; broad often roughly concentric slump masses in wall with flat floor partially or completely obscured by slumped material; prototype Triesnecker
  • TYC - craters with multiple tiers of teraces, crenulated rim crest, large flat floor, diameters 30 - 175 km; prototype Tycho.

image from LPOD Sept 23, 2004.

Degraded craters had additional classifications including ABU, CAP, GAM, and UNC - these will be described later.

Because the LPL Catalog was never published the classification information remains unavailable 30 years later. Classifications are on a partial copy of the LPL Catalog and they will be added, slowly, to the Moon Wiki. None of the farside craters had been classified so skilled visitors to the Moon Wiki can examine images of those craters and add classifications to the Additional Information sections of page; when approved each will be transfered to the data block at top.

- tychocrater Feb 24, 2008


Additional Information

LPOD Articles

A New/Old Catalog of Lunar Craters
Lunar Crater Types