Catalog of Planetary Maps
#495

Lyot, Bernard · Dollfus, Audouin

Planisphere of Mercury, summarizing the spots observed on 10 composite photographs obtained in 1942 and 1944.

Mercurymap

1961

Upper row: 1942, Lyot - 25 drawings, 36 inch refractor, 300-500x magnification.

Lower row: 1950, A Dollfus, 60-inch refractor, 750-900x magnification

picdumidi-mercury2picdumidi-mercury

Lyot and Camichel, 1942:  Map from 12 composites. 23 markings were measured.

Source: A. Dollfus: Visual and photographic studies off planets at the Pic du Midi. In: Planets and Satellites, GP Kuiper and B Middlehurst, eds. Chicago Univ Press 543-571.