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Lat: 2.8°N, Long: 17.3°E, Diam: 18 km, Depth: 1.2 km,
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LPOD Photo Gallery
Lunar Orbiter Images
Two extraordinary close-ups of
, made by Lunar Orbiter 5, are seen
(frames 080 and 083). One of them,
, shows also the little craterlet between
, which is an interesting target for those who want to test their telescope's optics (source: the dedicated moon-observer Antoine van der Jeugt). Research Lunar Orbiter 5 photographs: Danny Caes.
is quite an easy target during Full Moon, and an exquisite example of a High-Albedo crater whose unique system of dark rays were overlooked for hundreds of years, until reported in 1965 by
Leonardo and Miguel
shows an interesting photograph of the Waxing Crescent Moon, with earthshine, and also the remarkably distinct looking bright crater
in it (beyond the western "coast" of
). The cause of its distinct appearance (of
) is perhaps the system of dark rays around it, which makes
some kind of "popping out" crater, especially during "full moon" circumstances.
Feb 8, 2014
DIONYSIUS.--This crater, 13 miles in diameter, is one of the brightest spots on the lunar surface. It stands on the W. border of the Mare, about 30 miles W.N.W. of
. A distinct crater-row runs round its outer border on the E., and ultimately, as a delicate cleft, strikes across the Mare to the W. side of
. Both crater-row and cleft are easy objects in a 4 inch achromatic under morning illumination.
Depth data from
Kurt Fisher database
Westfall, 2000: 1.2 km
Viscardy, 1985: 2.7 km
Cherrington, 1969: 2.52 km
Inner wall scarp a steep 46° (
ALPO list of bright ray craters
is a good target to observe possible reflected light on its shadowed inner slopes (a couple of days after local sunrise, or a couple of days before local sunset).
Apr 27, 2009
High-Albedo inner slopes and reflected light
TSI = 20, CPI = 5, FI = 20; MI =45
Smith and Sanchez, 1973
Dionysius the Areopagite
), a little known saint who
reports observed a solar eclipse when Christ was crucified. Along with the saintly trio
, one of the few craters named for a religious person (other than the
of the 1600-1700s).
(p. 212), this name was introduced (in the form
(on Riccioli's map as
), although he used it for the crater now called
. Whitaker doesn't explain who moved the name to its present location.
Dionysius Dark Rays
, an interesting unofficial name printed on page 37 (chart 12) in the
21st Century Atlas of the Moon
How Deep is that Hole?
: Unusual & rare dark rays.
Remote Sensing Studies
of the Dionysius Region of the Moon. Giguere and others (2005) LPSC 36, #1092.
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