Extensive field, within an area of about 200km x 300 km of low volcanic domes west of the crater Marius. It is best seen at low illumination and near the terminator (~ 4 days after first or last quarter) (See Rükl photo 30)

Origin: Volcanic   Diameter: 200x300 km   Rukl: 29, 28    Type: Domes

Objects: Marius, Marius Hills, Reiner, Rima Marius, Rima Galilaei

Observation 1:
Location: Home

Date: 2024-06-19
Time: 10:20 PM AST
Equipment: 10" Meade SCT
Eyepiece: 10 mm eyepiece

Magnification: x250 
Seeing: Very Good (4)
Transparency: Good (3)

RI: Marius was a round crater with a low rim, flat floor. Marius Hills and Domes not seen in this session.
R2: Reiner was located SW of Marius; it was oval shaped and appeared to be deeper than and about half the size of Marius.

C1: The central peak in Reiner was elongated and actually in the centre.

C2: Rimae Marius was not observed.

C3: Rima Galilaei was not identified.


Observation 2:
Location: Home

Date: 2025-11-02
Time: 8:36 PM ADT
Equipment: 10" Meade SCT
Eyepiece: 10 mm eyepiece

Magnification: x250 
Seeing: Very Good (2)
Transparency: Very Good (2)

R1: Marius was seen as an oval-shaped crater with two craters - one in its NE floor and the other on the outer border of its SE wall. There was also an associated Crater E seen among the numerous hills and domes to its west. 

C1: Rimae Marius was seen to the north of Marius, looking like a wide "M" or a suspension bridge span. It seemed to make an artificial border between he hills and Oceanus Procellarum.

C3: Rima Galilaei was not identified.