Image:Hun Kal crater on Mercury cropped.png

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Description
English: A fresh new crater in the center of an older crater basin provides a landmark for the tiny crater named Hun kal- the Mayan number 20 - which is the basis for positioning the longitudes on Mercury. By definition, the 20° meridian passes through the center of this small crater. Assuming that the spin axis of Mercury is perpendicular to its orbital plane, the latitude of Hun Kal is 0.23°S. This picture, which covers an area of 130 by 170 km ( 90 by 105 mi), was taken from a distance of about 20,700 km (12,860 mi), a half-hour before Mariner made its first close flyby of Mercury, March 1974.
Source

http://history.nasa.gov/SP-424/p112.htm
Date
Author

Mariner 10
Permission
(Reusing this image)

see below
Other versions uncropped original version

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Public domain
 This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

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Date/TimeDimensionsUserComment
current21:22, 9 April 2008330×330 (77 KB)Bryan Derksen ({{Information |Description={{en|A fresh new crater in the center of an older crater basin provides a landmark for the tiny crater named Hun kal- the Mayan number 20 - which is the basis for positioning the longitudes on Mercury. By definition, the 20° me)
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