G ri rna Ed i 2005.Q4.22 16:32UT Age 14 days. 10-in f/E+fX+ToUcam (mosaic)

2005.94.22 -16:25 UT Age 13.8 days. 10-ln I/6 + 4X + ToUcam (mosaic)

Hevelius 67.60 W 2.20 N A walled plain with small central peak, 115 km in diameter. Its floor is cratered and crossed by an X-pattern of rilles (Rimae Hevelius, length 180 km).

Cavalerius 66.80 W 5.10 N A 57-km crater adjoining Hevelius, 3000 m in depth. It has a tiny central peak. The inner walls are terraced.

Lohrmann 67.20 W 0.50 S

A 30-km crater. It floor has several low hills.

Grimaldi 68.30 W 5.50 S

Grimaldi looks like a lava-flooded impact basin more than a crater. It is encircled by two concentric mountain rings, see Image T181A and the cross-section diagram in next page. The outer ring is partially ruined, about 400 km across. The inner ring is 200 km and the lava floor is 150 km. The nominal diameter of Grimaldi is 172 km. An inconspicuous system of rilles (Rimae Grimaldi, length 230 km) adjoins the south-east wall. A blade of dark shadow appears to cut along the northern rim. In T213, a dome with summit pits is found on the northern part of the floor; few smaller domes are also found under good seeing. Grimaldi contains a mascon which is probably the mantle uplift caused by sudden release of the impact pressure.

Cross-section of Grimaldi

Ejecta deposit (breccia)

Mantle uplift due to sudden release of impact pressure

Was this article helpful?

0 0

Post a comment