Zone 2 spans selenographic longitude 30°E to 50°E
sights best observed two or three days after the new or full Moon.
Lunar 100 objects that have not yet been photographed.
Lunar 100 objects that have been photographed.
Other objects that have been photographed.
The Lunar 100 list is from "Introducing the Lunar 100"
by Charles A. Wood (Sky &
Telescope, Sky Publishing Corp., April 2004,
Vol. 107, No. 4, pp. 113-120).
All rights remain with Sky Publishing Corp.
I (MSS) have transcribed this list for my personal use
and any errors are mine.
Unless stated otherwise, all photographs will be oriented
such that north is up and lunar west to the left.
02:00 UTC January 7, 2006
1/8 sec - f4.9 - ISO 100
25.0 mm eyepiece with barlow (291.8×)
This is an average of eight color and eight B&W images. Before combining
the color with B&W, the red-green-blue components in the color image
were aligned. After combination, the contrast enhanced slightly and
an unsharp mask (3.0; 1.0; 0) was applied.
Proclus is the source of L12 (N18), its "oblique-impact rays".
Note how the rays, the streaks of lighter material, radiate from
Proclus to the north, east and south but not to the west. This
implies something interesting happened here. The most likely cause
is an asteroid striking at a very shallow, or oblique, angle from
the southwest. But then why is the Proclus crater round and not
elongated from the southwest to the northeast?
Strangely enough, models indicate this is what should happen.
The asteroid is moving so fast that the surface material at the
point of impact can't get thrown out of the way. Instead, the
energy of the impact heats the surface material which explodes
outward creating a round crater. Only only on the periphery can
the sufrace material be thrown out, preferentially "splashing"
material away in the direction the asteroid was traveling.
02:38 UTC April 1, 2004
1/4 sec - f4.9 - ISO 400
12.5 mm eyepiece (300x)
Messier and Messier A are the small, white pair of craters, near
the center of the picture, in Mare Foecunditatis with the pair
of rays extending to the west-southwest. This is considered a
ricochet-impact pair. The rays are brighter material lying under
Mare Foecunditatis which was excavated by the impacts and preferentially
scattered in one direction. And yes, these craters are named for
Charles Messier, author of the famed Messier catalog of deep-sky
01:12 UTC April 15, 2005
1/15 sec - f4.9 - ISO 400
12.0 mm eyepiece (312x)
This is an average of two images with
an unsharp mask (5.0; 0.5; 0) applied.
Janssen Rille lies in Janssen
crater. The illumination is not optimal
here but one can just make out the valley extending northward and
slightly west of the central peak of the crater, then looping back
to the east towards the smaller overlapping crater, Fabricius.
To the northeast is Rheita Valley. Not a valley as we normally
think of it, Rheita is actually believed to
be a chain of closely spaced, overlapping craters.
04:33 UTC January 13, 2006
1/60 sec - f4.9 - ISO 100
12.0 mm eyepiece (312x)
This is a combination of eight B&W photos. I enhanced the contrast and
applied an unsharp mask (3.0; 1.0; 0.0) to each. I averaged the individual
images and, again, applied an unsharp mask (3.0; 1.0; 0.0) and enhanced
the contrast. The shadowing in the corners is vignetting. The camera is
seeing to the edge of the eyepiece. Move the cursor over the image to
see individual mountains labelled.
The name Leibnitz Mountains is not an officially sanctioned name but
has been in common use for many years. The two peaks at the edge of the
Moon's disk are designated M4 and M5 and are estimated to be 9,100 m
(30,000 ft) in height. A little inward from the edge are two more peaks
casting shadows towards the edge. These are M1 and M3 and are 4,600 and
7,600 m (15,000 and 25,000 ft) respectively. Some of this information
comes from the
Lunar 100 entry on the Leibnitz Mountains by Mike Tyrrell and
the Lunar Libration Zones" by Alexander Vandenbohede.
Last modified: 2009-04-25