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S
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873
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W
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25 km
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''Unknown''
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88
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is a small
Lunar Impact Crater that lies almost along the southwest limb of the
Moon . At this position the crater is ill-suited for observation from the
Earth as it is viewed almost from the side, and visibility is subject to
Libration effects. It lies to the west of the somewhat larger
Baade Crater , and south-southeast of
Graff Crater . This region of terrain is located in the outer southeastern part of the skirt of ''ejecta'' that surrounds the
Mare Orientale impact basin, and the nearby surface is rugged and streaky.
This is a somewhat irregular crater, although in general form it is circular. The rim is sharp-edged and displays little appearance of erosion. Sections of the inner wall appear to have slumped along the north and southeast, forming notches in the rim. The interior floor is rough and irregular, with no central peak of note.
Due west of Catalán, the satellite craters 'Catalán A' and the smaller 'Catalán B' form a joined pair, with each having a sharp rim and a bowl-shaped interior. To the northwest of 'Catalán A' is the nearly perfectly symmetrical, bowl-shaped 'Catalán U' crater.
By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Catalán crater.
