Lunar 100 overview

The Lunar 100 list was created by Charles A. Wood and published in Sky & Telescope 2004. The objects in the list are arranged in order of difficulty to observe — with increasing number the objects tend to become smaller and located closer to the lunar limb (where libration becomes a factor). Together with Maurice J. S. Collins, Wood has also edited an excellent moon atlas.

A logbook compiled by Peter Argenziano & Thomas Watson can be found here.

Photographs of all the Lunar 100 objects, captured with a cell phone camera (!), can be found at Arno van Werven’s Lunar Planetarium. Images of most of the objects can also be found at the Astrospider site. Other excellent sources for everything lunar is The-Moon wiki and the Cloudy Nights Lunar forum.

Links in the list leads to sketches published on the blog. So far I have observed and sketched 46 out of 100.

No Feature Name Significance
1 Moon Large satellite
2 Earthshine Twice reflected sunlight
3 Mare/highland dichotomy Two materials with distinct compositions
4 Apennines Imbrium basin rim
5 Copernicus Archetypal large complex crater
6 Tycho Large rayed crater with impact melts
7 Altai Scarp Nectaris basin rim
8 Theophilus, Cyrillus, Catharina Crater sequence illustrating stages of degradation
9 Clavius Lacks basin features in spite of its size
10 Mare Crisium Mare contained in large circular basin
11 Aristarchus Very bright crater with dark bands on its walls
12 Proclus Oblique-impact rays
13 Gassendi Floor-fractured crater
14 Sinus Iridum Very large crater with missing rim
15 Straight Wall Best example of a lunar fault
16 Petavius Crater with domed & fractured floor
17 Schröter’s Valley Giant sinuous rille
18 Mare Serenitatis dark edges Distinct mare areas with different compositions
19 Alpine Valley Lunar graben
20 Posidonius Floor-fractured crater
21 Fracastorius Crater with subsided & fractured floor
22 Aristarchus Plateau Mysterious uplifted region mantled with pyroclastics
23 Pico Isolated Imbrium basin-ring fragment
24 Hyginus Rille Rille containing rimless collapse pits
25 Messier & Messier A Oblique ricochet-impact pair
26 Mare Frigoris Arcuate mare of uncertain origin
27 Archimedes Large crater lacking central peak
28 Hipparchus First drawing of a single crater
29 Ariadaeus Rille Long, linear graben
30 Schiller Possible oblique impact
31 Taruntius Young floor-fractured crater
32 Arago Alpha & Beta Volcanic domes
33 Serpentine Ridge Basin inner-ring segment
34 Lacus Mortis Strange crater with rille & ridge
35 Triesnecker Rilles Rille family
36 Grimaldi basin A small two-ring basin
37 Bailly Barely discernible basin
38 Sabine & Ritter Possible twin impacts
39 Schickard Crater floor with Orientale basin ejecta stripe
40 Janssen Rille Rare example of a highland rille
41 Bessel ray Ray of uncertain origin near Bessel
42 Marius Hills Complex of volcanic domes & hills
43 Wargentin A crater filled to the rim with lava or ejecta
44 Mersenius Domed floor cut by secondary craters
45 Maurolycus Region of saturation cratering
46 Regiomontanus central peak Possible volcanic peak
47 Alphonsus dark spots Dark-halo eruptions on crater floor
48 Cauchy region Fault, rilles, & domes
49 Gruithuisen Delta & Gamma Volcanic domes formed with viscous lavas
50 Cayley Plains Light, smooth plains of uncertain origin
51 Davy crater chain Result of comet-fragment impacts
52 Crüger Possible volcanic caldera
53 Lamont Possible buried basin
54 Hippalus Rilles Rilles concentric to Humorum basin
55 Baco Unusually smooth crater floor & surrounding plains
56 Australe basin A partially flooded ancient basin
57 Reiner Gamma Conspicuous swirl & magnetic anomaly
58 Rheita Valley Basin secondary-crater chain
59 Schiller-Zucchius basin Badly degraded overlooked basin
60 Kies Pi Volcanic dome
61 Mösting A Simple crater close to center of lunar near side
62 Rümker Large volcanic dome
63 Imbrium sculpture Basin ejecta near & overlying Boscovich & Julius Caesar
64 Descartes Apollo 16 landing site; putative region of highland volcanism
65 Hortensius domes Dome field north of Hortensius
66 Hadley Rille Lava channel near Apollo 15 landing site
67 Fra Mauro formation Apollo 14 landing site on Imbrium ejecta
68 Flamsteed P Proposed young volcanic crater & Surveyor 1 landing site
69 Copernicus secondary craters Rays & craterlets near Pytheas
70 Humboldtianum basin Multi-ring impact basin
71 Sulpicius Gallus dark mantle Ash eruptions northwest of crater
72 Atlas dark-halo craters Explosive volcanic pits on the floor of Atlas
73 Smythii basin Difficult-to-observe basin scarp & mare
74 Copernicus H Dark-halo impact crater
75 Ptolemaeus B Saucerlike depression on the floor of Ptolemaeus
76 W. Bond Large crater degraded by Imbrium ejecta
77 Sirsalis Rille Procellarum basin radial rilles
78 Lambert R A buried “ghost” crater
79 Sinus Aestuum Eastern dark-mantle volcanic deposit
80 Orientale basin Youngest large impact basin
81 Hesiodus A Concentric crater
82 Linné Small crater once thought to have disappeared
83 Plato craterlets Crater pits at limits of detection
84 Pitatus Crater with concentric rilles
85 Langrenus rays Aged ray system
86 Prinz Rilles Rille system near the crater Prinz
87 Humboldt Crater with central peaks & dark spots
88 Peary Difficult-to-observe polar crater
89 Valentine Dome Volcanic dome
90 Armstrong, Aldrin & Collins Small craters near the Apollo 11 landing site
91 De Gasparis Rilles Area with many rilles
92 Gylden Valley Part of the Imbrium radial sculpture
93 Dionysius rays Unusual & rare dark rays
94 Drygalski Large south-pole region crater
95 Procellarum basin The Moon’s biggest basin?
96 Leibnitz Mountains Rim of South Pole-Aitken basin
97 Inghirami Valley Orientale basin ejecta
98 Imbrium lava flows Mare lava-flow boundaries
99 Ina D-shaped young volcanic caldera
100 Mare Marginis swirls Possible magnetic field deposits

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