AmericaSpace Launch Countdown

Next Launch SMAP on a Delta II 7320 rocket from Vandenberg AFB, CA
scheduled for:
30 Jan 15 14:20:42 GMT
30 Jan 15 6:20:42 PST
30 Jan 15 9:20:42 Eastern

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Crater obliteration stages

Fig. 3. Identified types of impact craters with various modification stages. Arrows indicate the illumination direction in each image, while the scale applies to all images. Class 1: (A) fresh crater cluster with ejecta (black) and exposed ice (white). Class 2: (B) small sharp crater. (C) Sharp crater. (D) Sharp crater with some polygonal fractures on the rim and aeolian fill on the floor. (E) Sharp crater with extensive polygonal fractures (note the lack of fractures in the surrounding terrain). Class 3: (F) Well defined but smooth crater. (G) Smooth crater. Class 4 feature: (H) a pit, not necessarily an impact feature. Image and caption provided by Dr. Jarmo Korteniemi

Fig. 3. Identified types of impact craters with various modification stages. Arrows indicate the illumination direction in each image, while the scale applies to all images. Class 1: (A) fresh crater cluster with ejecta (black) and exposed ice (white). Class 2: (B) small sharp crater. (C) Sharp crater. (D) Sharp crater with some polygonal fractures on the rim and aeolian fill on the floor. (E) Sharp crater with extensive polygonal fractures (note the lack of fractures in the surrounding terrain). Class 3: (F) Well defined but smooth crater. (G) Smooth crater. Class 4 feature: (H) a pit, not necessarily an impact feature. Image and caption provided by Dr. Jarmo Korteniemi

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