Hortensius (crater)

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Hortensius crater 4133 h1.jpg
Lunar Orbiter 4 image
(Note also lunar dome at top center)
Coordinates6°30′N 28°00′W / 6.5°N 28.0°W / 6.5; -28.0Coordinates: 6°30′N 28°00′W / 6.5°N 28.0°W / 6.5; -28.0
Diameter15 km (9 mi)
Depth2.9 km (1.8 mi)
Colongitude28° at sunrise
EponymMartin van den Hove
Image of lunar domes north of Hortensius, from Lunar Reconnaissance Orbiter

Hortensius is a small, bowl-shaped lunar impact crater that is located in the northern part of the Mare Insularum. It lies some distance to the west-southwest of the prominent crater Copernicus. Hortensius is circular and cup-shaped, with a small floor at the midpoint of the sloping interior walls. The interior has a higher albedo than the surrounding lunar mare, despite traces of ray material from Copernicus.

To the north of this feature is a collection of six lunar domes, many having a tiny craterlet at the summit. These are shield volcanoes that were formed by a highly viscous type of lava. The domes are generally circular in form, with a diameter of 6–8 kilometers (4–5 mi), and rising as high as 400 meters (1300 ft). Four of the six have Greek letters including Hortensius Sigma, Hortensius Tau west of it, Hortensius Phi to the north and Hortensius Omega to the southwest which is due north of Milichius crater. They are formed of the same material as the surrounding mare, although from a different process.

Apollo 12 Hasselblad image from film magazine 51/R - Orbital depicting the view of Hortensius above the Moon which is nearly on the mid-left of the photo

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 Hortensius.

Hortensius Latitude Longitude Diameter (km) Diameter (mi)
A 4.4° N 30.7° W 10 km 6 mi
B 5.3° N 29.5° W 6 km 4 mi
C 6.0° N 26.7° W 7 km 4 mi
D 5.4° N 32.3° W 6 km 4 mi
E 5.2° N 25.4° W 15 km 9 mi
F 7.1° N 25.6° W 6 km 4 mi
G 8.1° N 26.1° W 4 km 2½ mi
H 5.9° N 31.1° W 6 km 4 mi


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