October 27, 2014

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image by Carmelo Zannelli, Palermo, Sicily, Italy

Mare Undarum is a lunar "mare" located just on the lunar near side, between the crater Firmicus (near the center of this image) and the eastern limb and It's one of the many elevated lakes contained in the Crisium basin, surrounding Mare Crisium. The surrounding basin material is of the Nectarian Epoch, with the mare basalt being of the Imbrian epoch. Firmicus crater appears oval in shape due to foreshortening but It is, however, very nearly circular. The most notable aspect of Firmicus is the dark, flat floor. It has a similar albedo to the surface of Mare Crisium, to the north. The floor has suffered no significant impacts since it was created, although there are undoubtedly many minor impacts across its surface. Lacus Perseverantiae is a small lunar mare patch extending westward from the northwestern exterior of the crater Firmicus, with smaller extensions to the northeast and northwest at the eastern terminus. Its name is latin for Lake of Perseverance and it has a length of 70 km, but a maximum width of less than 15 km. The crater Dubyago, which here can be seen on the upper right edge of the mare, appears significantly foreshortened when viewed from the Earth. This crater has a somewhat worn outer rim which dips down to a low point along the northern rim, and has its maximum altitude along the eastern side. The most notable aspect of this crater, however, is the dark hue of the interior floor which matches the albedo of the mare to the northwest. Apollonius crater, lies to the west of Mare Undarum (here near the center-right of the image). The outer rim of Apollonius is somewhat worn and is overlain by a pair of small craters (including Apollonius E) across the western wall. The nearly flat interior floor has a low albedo and has been covered by lava. It lacks a central peak or notable small craters across the bottom.

Carmelo Zannelli

Technical Details
Celestron C14 StarBright ad F/22 – Baader FFC multiplier – Baader Ir-685nm filter – Basler ACA1300gm camera – Seeing max 5,5/10 in near IR band – site: Palermo city @ my personal "HolyLand Observatory"

Related Links
21st Century Atlas chart 2.
Mel's Facebook page and website

Yesterday's LPOD: Still Balmy After All These Years

Tomorrow's LPOD: Britannic Moon


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