Clausius Lunar Light Ray

Initial Reports

Date/Time: 2003/2/13, ~2:30 to 7:25 UT
Location: ASH Naylor Observatory, 670 Observatory Drive, Lewisberry, PA,
USA
Instrument: 17" f/15 classical Cassegrain
Magnifications: 162, 202, 216, 259, 381, 404, and 432x
Conditions: Clear to partly cloudy, windy, dome temperature - 20 degrees
Fahrenheit, relative humidity - 56%
Seeing: Variable
While observing the moon on Wednesday night, 2003/2/12 at ~9:30 p.m. EST (20003/2/13 at ~2:30 UT), I happened to notice a possible lunar sunrise ray in an area west of the crater Clausius in Lacus Excellentiae. The ray, located at approximately 46 degrees W and 37 degrees S, was a moderately narrow triangle when I first saw it. By the time I last looked at the moon at ~2:25 a.m. EST (~7:25 UT) the ray had broadened to the point that it was no longer recognizable as such.
Dave Mitsky
Harrisburg, PA
The Initial Predictions, Using Data in Original Reporting

Using the coordinates of the ASH Naylor Observatory, and the times given, we have:

Site Longitude = +76.880
Site Latitude = +40.150


Feature = Near Clausius
Feature Longitude: = -46.000
Feature  Latitude: = -37.000

Reproducing Lighting For: 2003/2/13 at 02:30 U.T.

Desired Solar Altitude =  +1.859(Rising),  Azimuth = +90.480
Average Co-longitude =  48.328

Crater Description:

Clausius, -555,-600: Although this crater is only 8 miles in diameter, it is conspicuous, and has a craterlet on the south crest with another on the northern. There is a small central hill on the interior. To the northwest is a heart-shaped crater, B, a striking object, with a crater on its north-west rim, and another on the inner north-east. To the northwest of B is a smaller crater, C, while on the west of B, beyond two craterlet chains, is the large ring, F, with three craterlets in a row on its interior. South of Clausius is crater D, which overlaps another to the south (Wilkins and Moore, The Moon, 1955, Faber & Faber Ltd)

crater map crater image


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