Kitt Peak Nightly Observing Program
Splendors of the Universe on YOUR Night!
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Copernicus is a large, conspicuous crater located in the Oceanus Procellarum (Ocean of Storms). It has extensive rays of ejecta spanning hundreds of kilometers from the rim of the crater. This crater is likely to be only hundreds of millions of years old—young for a lunar crater.
Gassendi is a large, 110 km wide, easy to recognize crater on the northern rim of the Mare Humorum. Gassendi and smaller crater Gassendi A together form a sort of ring-with-gemstone shape, making it easy to pick out the pair amongst all the other craters in the SW quadrant of the Moon. The floor of Gassendi is not very deep, and heavily fractured. Its central peaks are easy to see.
Mare Humorum is one of the smaller mare on the near side of the Moon. It is situated on the western hemisphere, south of Oceanus Procellarum. It is estimated to be about 3.9 billion years old, and is the site of one fo the Moon’s mascons. Mascons, short for mass concentrations) have slightly higher gravity than the are around them. Mare Humorum has some striking ridges and rilles. A prominant crater, Gassendi interupts the northern “coast” of Mare Humorum—its floor cracked with many rilles. Yet another, smaller crater interupts Gassendi’s northern rim—creating a memorable figure of a ring with gemstone.
The Mare Imbrium Impact Basin formed when a large object crashed into the Moon 3.9 billion years ago. subsurface lava rose to flood the giant crater, eventually solidifying into a younger, smoother terrain. Prominent features of Mare Imbrium include the crater Plato to the north, with a dark crater floor; Sinus Iridum (meaning Bay of Rainbows) to the northwest, with the Montes Jura mountain range forming a distinct C-shaped knob on the edge of the mare; and the 3 mountain ranges—Montes Alpes, Caucasus, and Apenninus—that mark the eastern edge of the mare.
Also known as a twilight zone, a terminator is where the shadow of night and the light of day come to meet on a planetary body. At the edge of where the Sun’s light reaches, the terminator is constantly moving as the Moon rotates. When observing the Moon, many features are best observed when they are near the terminator, where shadows are long and plentiful. The shadows provide higher contrast between surface features.
West of the Montes Caucasus, in the Mare Imbrium, is the lonely Mons Piton. Though Mons Piton is a part of the Montes Teneriffe lunar mountain range, it is far seperated form the rest of the peaks in this range.
On the eastern bank of the Mare Humorum lie a trio a satisfyingly concentric rilles.
The web page for the program in which you just participated is at
Nightly Observing Program. Most of the above images were taken as
the Overnight Telescope Observing Program. For more information on this unique experience please visit Overnight Telescope Observing Program.
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