Ash Observatory Lunar 100 1-50

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CURRENT MOON

moon phases

The "Lunar 100" was described by Sky & Telescope in their April 2004 article by Charles Wood. The objects are arranged in order from the easiest to the most difficult to view. The table below the map describes each object and has image links to the ones which I have observed.

Lunar 100 Log      PDF version

Click image for full size

L
Feature Name
Significance
Latitude Deg's
Longitude Deg's
Diameter (km)
Rükl Chart
1
Moon
Large satellite
-
-
3,476
-
2
Earthshine
Twice reflected sunlight
-
-
-
-
 
3
Mare/highland dichotomy
Two material with distict 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, Cyrilus, 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 it
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
Schroters Valley
Gaint 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 garben
49.0N
3.0E
165

 
4

 

20

Posidonius

Floor-fractured crater

31.8N

29.9E

95

 
14

 

21

Fracastirius

Crater with subsided & fractured floor

21.5S

33.2E

124

 
58

22

Aristarchus Plateau

Mysterious uplifted mantled with pyrolastics

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 riochet-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

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 Orientate basin ejecta stripe

44.3S

55.3E

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

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

Area 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

Click image for full size

L
Feature Name
Significance
Latitude Deg's
Longitude Deg's
Diameter (km)
Rükl Chart

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