De Sitter

(current IAU name; formerly Euctemon J)

Lat: 80.1°N, Long: 39.6°E, Diam: 64 km, Depth: 3.68 km, Rükl: 5, Nectarian

Images

Depth data from Kurt Fisher database
- Cherrington, 1969: 3.68 km
Central peak height
- Sekiguchi, 1972: 0.4 km "A long dyke runs through the floor in north-south direction, on whose central part, stands a central peak." - fatastronomer

Named for Willem de Sitter (May 6, 1872 – November 20, 1934), a Dutch mathematician, physicist and astronomer. He made major contributions to the field of physical cosmology.
The name Euctemon J was inserted into the original IAU nomenclature of Named Lunar Formations as Catalog Number 999c, where it is noted that Franz called the feature Euctemon i.
The replacement name De Sitter was proposed by Arthur and Whitaker in the Rectified Lunar Atlas (1963) and approved by IAU in 1964.

- In Mysterious Universe, a handbook of astronomical anomalies (1979) :

Page 612: Was there really a Big Bang? (G.Burbidge, Nature, 1971).
Page 670: Aether Drift Detected At Last (Michael Rowan-Robinson, Nature, 1977).