(discontinued(?) IAU name)
Lat: 9.2°S, Long: 1.8°W, Length: 153 km, Depth: km, Rükl 44
LO-IV-108H Rima Ptolemaeus was the name used to describe the row of depressions on the western floor of Ptolemaeus, the large crater filling the frame on the right. It started to the southwest of Ptolemaeus L and terminated at the deep gouge-like crater to the east of Ptolemaeus E.
- The position and length listed in the IAU Planetary Gazetteer (and repeated in the title line of this page), seem a bit odd. The Rima Ptolemaeus I of the System of Lunar Craters was 40-50 km long, centered at 9.6°S, Long: 4.0°W
- This feature is catalog entry 2984 in Mary Blagg's Collated List, where it is described as Neison's Ptolemäus Phi.
- It entered the original IAU nomenclature of Named Lunar Formations as Ptolemaeus Ir, named after the crater within which it lies, Ptolemaeus.
- The name was Latinized to Rima Ptolemaeus I in the System of Lunar Craters, where it is plotted on the Quad Maps.
- It was not plotted on LAC 77 (1963), and there's nothing of it to see on Chart 69 in the Times Atlas of the Moon.
- The name Rima Ptolemaeus was apparently eliminated during the preparation of the IAU Planetary Gazetteer, where it is listed as "a Catena, not a Rima" with a drop date of "1985". No record of the name actually having been dropped exists in IAU Transactions XIXB, the volume for 1985.