Hyginus (crater)

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Hyginus crater 4097 h1.jpg
Coordinates7°48′N 6°18′E / 7.8°N 6.3°E / 7.8; 6.3Coordinates: 7°48′N 6°18′E / 7.8°N 6.3°E / 7.8; 6.3
Diameter11 km
Depth0.8 km
Colongitude354° at sunrise
EponymC. Julius Hyginus

Hyginus is a lunar caldera located at the east end of the Sinus Medii. It was named after ancient Roman astronomer Gaius Julius Hyginus.[1] Its rim is split by a 220 kilometer-long rille, Rima Hyginus, that branches to the northwest and to the east-southeast. The crater is deeper than the rille, and lies at intersection of the rille's branches. Together, the crater and the rille form a prominent feature in an otherwise flat surface. Smaller craters along the length of the rille may have been caused by the collapse of an underlying structure.[citation needed]

Hyginus is one of the few craters on the Moon that was not created as a result of an impact, and is instead believed to be volcanic in origin. It lacks the raised outer rim that is typical with impact craters.[citation needed] Hyginus was considered a possible landing site during the Apollo Program, because it was thought to be a site of potentially active volcanism.[2]


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 Hyginus.

Hyginus Latitude Longitude Diameter
A 6.3° N 5.7° E 8 km
B 7.6° N 5.1° E 6 km
C 7.7° N 8.3° E 5 km
D 11.4° N 4.3° E 5 km
E 8.7° N 8.5° E 4 km
F 8.0° N 8.6° E 4 km
G 11.0° N 6.0° E 4 km
H 6.0° N 7.0° E 4 km
N 10.5° N 7.4° E 11 km
S 6.4° N 8.0° E 29 km
W 9.7° N 7.7° E 22 km
Z 8.0° N 9.5° E 28 km


  1. ^ "Hyginus (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
  2. ^ To a Rocky Moon: A Geologist's History of Lunar Exploration. Don E. Wilhelms, University of Arizona Press (1993), Chapter 10. ISBN 978-0816510658

External links[edit]