Ash Observatory Lunar 100 1-50

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