The Lunar 100 (continued)
L	Feature Name	Significance	Lat. (°)	Long. (°)	Diam. (km)	Rükl Chart
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
Chart numbers refer to Antonín Rükl's Atlas of the Moon.

For additional details, see my article "Introducing the Lunar 100" in the April 2004 Sky & Telescope. If you don't have that issue handy, the article is also available in the S&T Magazine Archive on ProQuest as a half-megabyte PDF. The PDF can be downloaded for free by archive subscribers and for a nominal fee otherwise. To read the PDF, you'll need Adobe Reader, which is available at no cost for most computers.

For the convenience of observers, the Lunar 100 is also available on Sky & Telescope's 9-by-12-inch Lunar 100 Card, which has a map on one side and a table on the other. It comes in two versions: unlaminated ($3.95) and laminated ($4.95).