Lunar 100

/Lunar 100
Lunar 100 2017-09-12T13:10:23+00:00

This is my attempt at imaging all of the Lunar 100 as devised by Charles A. Wood in Sky and Telescope, May 2004.

Objects in the Lunar 100 are arranged from the easiest to view to the most difficult. This is more systematic than the haphazard approach that produced the Messier list. Indeed, just by knowing a feature’s Lunar 100 number, you have some idea of how easy or challenging it will be to see. For example, the Moon itself is L1, while L2 is earthshine and L3 is the light/dark dichotomy between lunar highlands and maria (“seas”).
Charles Wood
Planetary scientist Charles Wood’s Lunar 100 is a list of telescopic sights designed to ignite interest in the Moon and enhance understanding of its geology.

In many of these images I have chosen to use the “Auto Levels” setting in PhotoShop CS3, which seems to add “enhanced” colour to the image and brings out more contrast in the lunar materials. Although not an accurate representation of what you actually see on the Moon, it seems to me that it does help in identifying features of lunar geology – which is the whole point of the Lunar 100 after all. For example, in L18 Mare Serenitatis, the dark edges stand out significantly more in the “enhanced” picture.

Lunar100
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Items with links have been imaged.

L Feature Name Significance Lat. (°) Long. (°) Diam. (km)
1 Moon Large satellite 3,476
2 Earthshine Twice reflected sunlight
3 Mare/highland dichotomy Two materials with distinct compositions
4 Apennines Imbrium basin rim 18.9N 3.7W 70
5 Copernicus Archetypal large complex crater 9.7N 20.1W 93
6 Tycho Large rayed crater with impact melts 43.4S 11.1W 85
7 Altai Scarp Nectaris basin rim 24.3S 22.6E 425
8 Theophilus, Cyrillus, Catharina Crater sequence illustrating stages of degradation 13.2S 24.0E
9 Clavius Lacks basin features in spite of its size 58.8S 14.1W 225
10 Mare Crisium Mare contained in large circular basin 18.0N 59.0E 540
11 Aristarchus Very bright crater with dark bands on its walls 23.7N 47.4W 40
12 Proclus Oblique-impact rays 16.1N 46.8E 28
13 Gassendi Floor-fractured crater 17.6S 40.1W 101
14 Sinus Iridum Very large crater with missing rim 45.0N 32.0W 260
15 Straight Wall Best example of a lunar fault 21.8S 7.8W 110
16 Petavius Crater with domed & fractured floor 25.1S 60.4E 177
17 Schröter’s Valley Giant sinuous rille 26.2N 50.8W 168
18 Mare Serenitatis dark edges Distinct mare areas with different compositions 17.8N 23.0E N/A
19 Alpine Valley Lunar graben 49.0N 3.0E 165
20 Posidonius Floor-fractured crater 31.8N 29.9E 95
21 Fracastorius Crater with subsided & fractured floor 21.5S 33.2E 124
22 Aristarchus Plateau Mysterious uplifted region mantled with pyroclastics 26.0N 51.0W 150
23 Pico Isolated Imbrium basin-ring fragment 45.7N 8.9W 25
24 Hyginus Rille Rille containing rimless collapse pits 7.4N 7.8E 220
25 Messier & Messier A Oblique ricochet-impact pair 1.9S 47.6E 11
26 Mare Frigoris Arcuate mare of uncertain origin 56.0N 1.4E 1600
27 Archimedes Large crater lacking central peak 29.7N 4.0W 83
28 Hipparchus First drawing of a single crater 5.5S 4.8E 150
29 Ariadaeus Rille Long, linear graben 6.4N 14.0E 250
30 Schiller Possible oblique impact 51.9S 39.0W 180
31 Taruntius Young floor-fractured crater 5.6N 46.5E 56
32 Arago Alpha & Beta Volcanic domes 6.2N 21.4E 26
33 Serpentine Ridge Basin inner-ring segment 27.3N 25.3E 155
34 Lacus Mortis Strange crater with rille & ridge 45.0N 27.2E 152
35 Triesnecker Rilles Rille family 4.3N 4.6E 215
36 Grimaldi basin A small two-ring basin 5.5S 68.3W 440
37 Bailly Barely discernible basin 66.5S 69.1W 303
38 Sabine & Ritter Possible twin impacts 1.7N 19.7E 30
39 Schickard Crater floor with Orientale basin ejecta stripe 44.3S 55.3W 227
40 Janssen Rille Rare example of a highland rille 45.4S 39.3E 190
41 Bessel ray Ray of uncertain origin near Bessel 21.8N 17.9E N/A
42 Marius Hills Complex of volcanic domes & hills 12.5N 54.0W 125
43 Wargentin A crater filled to the rim with lava or ejecta 49.6S 60.2W 84
44 Mersenius Domed floor cut by secondary craters 21.5S 49.2W 84
45 Maurolycus Region of saturation cratering 42.0S 14.0E 114
46 Regiomontanus central peak Possible volcanic peak 28.0S 0.6W 124
47 Alphonsus dark spots Dark-halo eruptions on crater floor 13.7S 3.2W 119
48 Cauchy region Fault, rilles, & domes 10.5N 38.0E 130
49 Gruithuisen Delta & Gamma Volcanic domes formed with viscous lavas 36.3N 40.0W 20
50 Cayley Plains Light, smooth plains of uncertain origin 4.0N 15.1E 14
51 Davy crater chain Result of comet-fragment impacts 11.1S 6.6W 50
52 Crüger Possible volcanic caldera 16.7S 66.8W 45
53 Lamont Possible buried basin 4.4N 23.7E 106
54 Hippalus Rilles Rilles concentric to Humorum basin 24.5S 29.0W 240
55 Baco Unusually smooth crater floor & surrounding plains 51.0S 19.1E 69
56 Australe basin A partially flooded ancient basin 49.8S 84.5E 880
57 Reiner Gamma Conspicuous swirl & magnetic anomaly 7.7N 59.2W 70
58 Rheita Valley Basin secondary-crater chain 42.5S 51.5E 445
59 Schiller-Zucchius basin Badly degraded overlooked basin 56.0S 45.0W 335
60 Kies Pi Volcanic dome 26.9S 24.2W 45
61 Mösting A Simple crater close to center of lunar near side 3.2S 5.2W 13
62 Rümker Large volcanic dome 40.8N 58.1W 70
63 Imbrium sculpture Basin ejecta near & overlying Boscovich & Julius Caesar 11.0N 12.0E
64 Descartes Apollo 16 landing site; putative region of highland volcanism 11.7S 15.7E 48
65 Hortensius domes Dome field north of Hortensius 7.6N 27.9W 10
66 Hadley Rille Lava channel near Apollo 15 landing site 25.0N 3.0E
67 Fra Mauro formation Apollo 14 landing site on Imbrium ejecta 3.6S 17.5W
68 Flamsteed P Proposed young volcanic crater & Surveyor 1 landing site 3.0S 44.0W 112
69 Copernicus secondary craters Rays & craterlets near Pytheas 19.6N 19.1W 4
70 Humboldtianum basin Multi-ring impact basin 57.0N 80.0E 650
71 Sulpicius Gallus dark mantle Ash eruptions northwest of crater 19.6N 11.6E 12
72 Atlas dark-halo craters Explosive volcanic pits on the floor of Atlas 46.7N 44.4E 87
73 Smythii basin Difficult-to-observe basin scarp & mare 2.0S 87.0E 740
74 Copernicus H Dark-halo impact crater 6.9N 18.3W 5
75 Ptolemaeus B Saucerlike depression on the floor of Ptolemaeus 8.0S 0.8W 16
76 W. Bond Large crater degraded by Imbrium ejecta 65.3N 3.7E 158
77 Sirsalis Rille Procellarum basin radial rilles 15.7S 61.7W 425
78 Lambert R A buried “ghost” crater 23.8N 20.6W 54
79 Sinus Aestuum Eastern dark-mantle volcanic deposit 12.0N 3.5W 90
80 Orientale basin Youngest large impact basin 19.0S 95.0W 930
81 Hesiodus A Concentric crater 30.1S 17.0W 15
82 Linné Small crater once thought to have disappeared 27.7N 11.8E 2.4
83 Plato craterlets Crater pits at limits of detection 51.6N 9.4W 101
84 Pitatus Crater with concentric rilles 29.8S 13.5W 97
85 Langrenus rays Aged ray system 8.9S 60.9E 132
86 Prinz Rilles Rille system near the crater Prinz 27.0N 43.0W 46
87 Humboldt Crater with central peaks & dark spots 27.0S 80.9E 207
88 Peary Difficult-to-observe polar crater 88.6N 33.0E 74
89 Valentine Dome Volcanic dome 30.5N 10.1E 30
90 Armstrong, Aldrin & Collins Small craters near the Apollo 11 landing site 1.3N 23.7E 3
91 De Gasparis Rilles Area with many rilles 25.9S 50.7W 30
92 Gylden Valley Part of the Imbrium radial sculpture 5.1S 0.7E 47
93 Dionysius rays Unusual & rare dark rays 2.8N 17.3E 18
94 Drygalski Large south-pole region crater 79.3S 84.9W 162
95 Procellarum basin The Moon’s biggest basin? 23.0N 15.0W 3200
96 Leibnitz Mountains Rim of South Pole-Aitken basin 85.0S 30.0E
97 Inghirami Valley Orientale basin ejecta 44.0S 73.0W 140
98 Imbrium lava flows Mare lava-flow boundaries 32.8N 22.0W
99 Ina D-shaped young volcanic caldera 18.6N 5.3E 3
100 Mare Marginis swirls Possible magnetic field deposits 18.5N 88.0E