Kitt Peak Nightly Observing Program
Splendors of the Universe on YOUR Night!
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Because of its very smooth, dark floor, Plato is a very distinct crater, seen just north of Mare Imbrium. Plato is 101 km across, and the peaks of the rim rise 2,000 meters above the floor.
Pythagoras is a large crater located nearly all the way to the western limb of the near side of the Moon. Because of our oblique viewing angle from Earth, it appears as a very elongated elliptical crater, but is infact circular. Its terraced walls and central peak are best viewed when near the terminator.
Tycho is a prominent crater on the Moon—but it doesn’t stand out because of its size. At 85 km in diameter it is one of thousands of craters on the Moon its size and larger. Tycho stands out because of its rays. Crater rays are formed by ejecta—dust and debris ejected from the surface during and impact event, that spreads upwards and outwards, and eventually settles back down on the surface to leave behind radial spikes around newly formed craters. Prominent and extensive rays suggest that a crater is fresher, or more recently formed. Tycho may be as young as 108 million years old. That may sound old, but craters on the Moon can remain for billions of years.
Mare Crisium is distinctly seperated from all of the other maria on the near side of the Moon, making it easy to distinguish. This round feature on the Moon is nearing the eastern limb, and so, is severly foreshortened—meaning, we are not looking at it straigh on, but at an angle.
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.
Your Telescope Operator and Guide. Thank you for joining me this evening! See you soon!!
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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