Science Fair Project Encyclopedia
Ammonius (crater)
Ammonius is a bowl-shaped lunar impact crater with a slightly raised rim. It is located on the floor of the walled-plain Ptolemaeus, about 30 kilometers northeast of the crater mid-point. In the past this crater was identified as 'Ptolemaeus A', before being named by the IAU.
Just to the north on the lava-flooded floor of Ptolemaeus crater is a relatively prominent "ghost" crater: the discernable buried rim of a pre-existing crater. The diameter of this ghost crater is nearly double that of Ammonius, and is currently identified as Ptolemaeus B.
Last updated: 05-09-2005 21:09:20
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details