Lunar 100

Description

The Lunar 100 list is an attempt to provide Moon lovers with something akin to what deep-sky observers enjoy with the Messier catalog: a selection of telescopic sights to ignite interest and enhance understanding. Presented here is a selection of the Moon's 100 most interesting regions, craters, basins, mountains, rilles, and domes. I challenge observers to find and observe them all and, more important, to consider what each feature tells us about lunar and Earth history.

(Note: Chuck Wood's Lunar 100 originated in his column in the popular astronomy magazine Sky and Telescope, and the primary reference describing it remains the 2004 S&T article cited at the end. Individual features on the list were described at length in subsequent columns.)


Lunar 100 List


L
Feature Name
Significance
Lat. (°)
Long. (°)
Diam. (km)
Rükl Chart
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
22
5
Copernicus
Archetypal large complex crater
9.7N
20.1W
93
31
6
Tycho
Large rayed crater with impact melts
43.4S
11.1W
85
64
7
Altai Scarp
Nectaris basin rim
24.3S
22.6E
425
57
8
Theophilus, Cyrillus, Catharina
Crater sequence illustrating stages of degradation
13.2S
24.0E

46, 57
9
Clavius
Lacks basin features in spite of its size
58.8S
14.1W
225
72
10
Mare Crisium
Mare contained in large circular basin
18.0N
59.0E
540
26, 27, 37, 38
11
Aristarchus
Very bright crater with dark bands on its walls
23.7N
47.4W
40
18
12
Proclus
Oblique-impact rays
16.1N
46.8E
28
26
13
Gassendi
Floor-fractured crater
17.6S
40.1W
101
52
14
Sinus Iridum
Very large crater with missing rim
45.0N
32.0W
260
10
15
Straight Wall
Best example of a lunar fault
21.8S
7.8W
110
54
16
Petavius
Crater with domed & fractured floor
25.1S
60.4E
177
59
17
Schröter's Valley
Giant sinuous rille
26.2N
50.8W
168
18
18
Mare Serenitatis dark edges
Distinct mare areas with different compositions
17.8N
23.0E
N/A
24
19
Alpine Valley
Lunar graben
49.0N
3.0E
165
4
20
Posidonius
Floor-fractured crater
31.8N
29.9E
95
14
21
Fracastorius
Crater with subsided & fractured floor
21.5S
33.2E
124
58
22
Aristarchus Plateau
Mysterious uplifted region mantled with pyroclastics
26.0N
51.0W
150
18
23
Pico
Isolated Imbrium basin-ring fragment
45.7N
8.9W
25
11
24
Hyginus Rille
Rille containing rimless collapse pits
7.4N
7.8E
220
34
25
Messier & Messier A
Oblique ricochet-impact pair
1.9S
47.6E
11
48
26
Mare Frigoris
Arcuate mare of uncertain origin
56.0N
1.4E
1600
2–6
27
Archimedes
Large crater lacking central peak
29.7N
4.0W
83
"12, 22"
28
Hipparchus
First drawing of a single crater
5.5S
4.8E
150
"44, 45"
29
Aridaeus Rille
"Long, linear graben"
6.4N
14.0E
250
34
30
Schiller
Possible oblique impact
51.9S
39.0W
180
71
31
Taruntius
Young floor-fractured crater
5.6N
46.5E
56
37
32
Arago Alpha & Beta
Volcanic domes
6.2N
21.4E
26
35
33
Serpentine Ridge
Basin inner-ring segment
27.3N
25.3E
155
24
34
Lacus Mortis
Strange crater with rille & ridge
45.0N
27.2E
152
14
35
Triesnecker Rilles
Rille family
4.3N
4.6E
215
33
36
Grimaldi basin
A small two-ring basin
5.5S
68.3W
440
39
37
Bailly
Barely discernible basin
66.5S
69.1W
303
71
38
Sabine & Ritter
Possible twin impacts
1.7N
19.7E
30
35
39
Schickard
Crater floor with Orientale basin ejecta stripe
44.3S
55.3W
227
62
40
Janssen Rille
Rare example of a highland rille
45.4S
39.3E
190
"67, 68"
41
Bessel ray
Ray of uncertain origin near Bessel
21.8N
17.9E
N/A
24
42
Marius Hills
Complex of volcanic domes & hills
12.5N
54.0W
125
"28, 29"
43
Wargentin
A crater filled to the rim with lava or ejecta
49.6S
60.2W
84
70
44
Mersenius
Domed floor cut by secondary craters
21.5S
49.2W
84
51
45
Maurolycus
Region of saturation cratering
42.0S
14.0E
114
66
46
Regiomontanus central peak
Possible volcanic peak
28.0S
0.6W
124
55
47
Alphonsus dark spots
Dark-halo eruptions on crater floor
13.7S
3.2W
119
44
48
Cauchy region
"Fault, rilles, & domes"
10.5N
38.0E
130
36
49
Gruithuisen Delta & Gamma
Volcanic domes formed with viscous lavas
36.3N
40.0W
20
9
50
Cayley Plains
"Light, smooth plains of uncertain origin"
4.0N
15.1E
14
34
51
Davy crater chain
Result of comet-fragment impacts
11.1S
6.6W
50
43
52
Crüger
Possible volcanic caldera
16.7S
66.8W
45
50
53
Lamont
Possible buried basin
4.4N
23.7E
106
35
54
Hippalus Rilles
Rilles concentric to Humorum basin
24.5S
29.0W
240
"52, 53"
55
Baco
Unusually smooth crater floor & surrounding plains
51.0S
19.1E
69
74
56
Australe basin
A partially flooded ancient basin
49.8S
84.5E
880
76
57
Reiner Gamma
Conspicuous swirl & magnetic anomaly
7.7N
59.2W
70
28
58
Rheita Valley
Basin secondary-crater chain
42.5S
51.5E
445
68
59
Schiller-Zucchius basin
Badly degraded overlooked basin
56.0S
45.0W
335
"70, 71"
60
Kies Pi
Volcanic dome
26.9S
24.2W
45
53
61
Mösting A
Simple crater close to center of lunar near side
3.2S
5.2W
13
43
62
Rümker
Large volcanic dome
40.8N
58.1W
70
8
63
Imbrium sculpture
Basin ejecta near & overlying Boscovich & Julius Caesar
11.0N
12.0E

34
64
Descartes
Apollo 16 landing site; putative region of highland volcanism
11.7S
15.7E
48
45
65
Hortensius domes
Dome field north of Hortensius
7.6N
27.9W
10
30
66
Hadley Rille
Lava channel near Apollo 15 landing site
25.0N
3.0E

22
67
Fra Mauro formation
Apollo 14 landing site on Imbrium ejecta
3.6S
17.5W

42
68
Flamsteed P
Proposed young volcanic crater & Surveyor 1 landing site
3.0S
44.0W
112
40
69
Copernicus secondary craters
Rays & craterlets near Pytheas
19.6N
19.1W
4
20
70
Humboldtianum basin
Multi-ring impact basin
57.0N
80.0E
650
7
71
Sulpicius Gallus dark mantle
Ash eruptions northwest of crater
19.6N
11.6E
12
23
72
Atlas dark-halo craters
Explosive volcanic pits on the floor of Atlas
46.7N
44.4E
87
15
73
Smythii basin
Difficult-to-observe basin scarp & mare
2.0S
87.0E
740
"38, 49"
74
Copernicus H
Dark-halo impact crater
6.9N
18.3W
5
31
75
Ptolemaeus B
Saucer like depression on the floor of Ptolemaeus
8.0S
0.8W
16
44
76
W. Bond
Large crater degraded by Imbrium ejecta
65.3N
3.7E
158
4
77
Sirsalis Rille
Procellarum basin radial rilles
15.7S
61.7W
425
"39, 50"
78
Lambert R
"A buried ""ghost"" crater"
23.8N
20.6W
54
20
79
Sinus Aestuum
Eastern dark-mantle volcanic deposit
12.0N
3.5W
90
33
80
Orientale basin
Youngest large impact basin
19.0S
95.0W
930
50
81
Hesiodus A
Concentric crater
30.1S
17.0W
15
54
82
Linné
Small crater once thought to have disappeared
27.7N
11.8E
2.4
23
83
Plato craterlets
Crater pits at limits of detection
51.6N
9.4W
101
"3, 4"
84
Pitatus
Crater with concentric rilles
29.8S
13.5W
97
54
85
Langrenus rays
Aged ray system
8.9S
60.9E
132
49
86
Prinz Rilles
Rille system near the crater Prinz
27.0N
43.0W
46
19
87
Humboldt
Crater with central peaks & dark spots
27.0S
80.9E
207
60
88
Peary
Difficult-to-observe polar crater
88.6N
33.0E
74
"4, II"
89
Valentine Dome
Volcanic dome
30.5N
10.1E
30
13
90
"Armstrong, Aldrin & Collins"
Small craters near the Apollo 11 landing site
1.3N
23.7E
3
35
91
De Gasparis Rilles
Area with many rilles
25.9S
50.7W
30
51
92
Gylden Valley
Part of the Imbrium radial sculpture
5.1S
0.7E
47
44
93
Dionysius rays
Unusual & rare dark rays
2.8N
17.3E
18
35
94
Drygalski
Large south-pole region crater
79.3S
84.9W
162
"72, VI"
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

"73, V"
97
Inghirami Valley
Orientale basin ejecta
44.0S
73.0W
140
61
98
Imbrium lava flows
Mare lava-flow boundaries
32.8N
22.0W

10
99
Ina
D-shaped young volcanic caldera
18.6N
5.3E
3
22
100
Mare Marginis swirls
Possible magnetic field deposits
18.5N
88.0E

"27, III"

Additional Information

The Lunar 101-200 (a list of 100 lunar surface formations of which each one is worthwile to observe through powerful amateur-telescopes) is not yet online, but could be an important guide for those who want to know much more about really bizarre shaped craterlets and hillocks on the moon's near side. The first one in the Lunar 101-200 list (Number 101) could be the partially buried craterlet at the southeastern slope of the hill Euler Gamma. See: Partially Buried Craters. - DannyCaes DannyCaes Dec 6, 2008
Number 102? Might be the triplet at Encke M (east of Encke).
Number 103? Might be the unnamed twin-craterlets west of NASA's Hill 305 (aka Fresnel Ridge near Rima Hadley).
Number 104? (??).
To be continued... (perhaps on a new page).

Other Observing Programs


LPOD Articles

LPOD LUNAR 100
Lunar 100

Lunar 100 Links

Kerry Astronomy Club, Ireland
Observing the Lunar 100, East Valley Astronomy Club, AZ
Lunar 100 Observing Club, Raleigh Astronomy Club, NC
George Tarsoudis, Greece

Bibliography

Chuck Wood (2004) The Lunar 100 -- original Sky and Telescope article (on-line)
Chuck Wood (2004) Lunar 100 Card



This page has been edited 51 times. The last modification was made by - JohnMoore2 JohnMoore2 on Mar 29, 2012 2:41 am