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Lat: 16.04°N, Long: 46.82°E, Diam: 26.91 km, Depth: 1.9 km,
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Lunar Orbiter Images
shows an orbital high-sun look at
and its ray system. Research: David Woods (
Apollo 15 Flight Journal
image below - WAC No.
at the curved lunar horizon, captured by Apollo 10 in orbit around the moon (1969):
. Research Danny Caes
The most striking feature of Proclus is its non-continuous distribution of rays. A zone of avoidance to the east-south east is so pronouncedly dark that it Riccioli named it Palus Somni. Actually, Proclus formed by such an oblique impact, with the projectile coming from the east-southeast, that no rays were emplaced in the uprange direction, creating the Somni zone of avoidance.
PROCLUS.--One of the most brilliant objects on the moon's visible surface, and hence extremely difficult to observe satisfactorily. It is about 18 miles in diameter, with very steep walls, and, according to Schmidt, has a small crater on its west border, where Madler shows a break. It is questionable whether there is a central mountain. It is the centre of a number of radiating light streaks which partly traverse the
, and with those emanating from
, and other objects thereon, form a very complicated system.
Depth data from
Kurt Fisher database
Pike, 1976: 1.9 km
Westfall, 2000: 4.04 km
Viscardy, 1985: 2.4 km
Cherrington, 1969: 3.62 km
East rim slope 29° (
Exterior impact melt deposits most extensive to SW (
Hawke and Head, 1977
Thermal anomaly crater, implying youthful age -
Moore et al, 1980
ALPO list of bright ray craters
Proclus and its satellite craters A, D, G and J are on the
ALPO list of banded craters
Ejecta blanket with forbidden zone suggest impact angle of 10°-15°, and downrange rim height is 1 km compared to 250 m for uprange section (
Forsberg, Herrick & Bussey
Proclus is an interesting target to observe possible reflected light on its shadowed eastern inner slopes, this during the moon's
phase (one or two terrestrial days after the local sunrise at Proclus).
Apr 27, 2009
High-Albedo inner slopes and reflected light
TSI = 20, CPI = 5, FI = 20; MI =45
Smith and Hartnell, 1973
V.A. Firsoff noticed a sudden brightening of
on the 8th of September 1954 (about 20h U.T.), as observed through a blue Dufay tricolour separation filter (source:
The Old Moon and the New
, V.A. Firsoff, page 183).
(February 8, 412 – April 17, 485), surnamed "The Successor" or "Diadochos", a Greek Neoplatonist philosopher, one of the last major Greek philosophers. Also, an astronomer - he is reported to have made "the last astronomical observation in the ancient Greek world in AD 475." C. Freeman (2002)
The Closing of the Western Mind
, p. XIX.
Jul 26, 2007
(p. 196), this crater was labeled
; and later apparently labeled
(p. 203), who depicted it with a ring of peaks on his nomenclature map, but Hevelius seems to have repeated the same name to the south, near the northeast shore of the modern
, so it unclear exactly what he meant by it.
The present name was introduced on
's map (
, p. 214), and has continued unchanged since then.
is the site of the so-called
Also somewhere in this vicinity should be a couple of surface formations which were once called
. These two nicknames appeared in the article
Illusions that Trap Lunar Observers
by Leland S. Copeland;
Sky and Telescope
April 1956, pages 248-251. Research Danny Caes.
: Oblique-impact rays.
Mosaic image of
. Excerpt from the
USGS Digital Atlas of the Moon
"Bridge of O'Neill":
by H.P. Wilkins and P.Moore.
APOLLO OVER THE MOON; A VIEW FROM ORBIT, Chapter 5: Craters (
), Figure 147.
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