Date: 19 Jul 03 Time: approx 0900 - 0920 hrs UT Location: Kingston, Ontario, Canada Instrument: 102 mm F/9.8 achromatic refractor with Sirius Optics MV-1 filter Magnification: 100 X to 165 X Seeing: 5/6
Details: observed a prominent sunset ray across the floor of
Catharina. Ray oriented approximately SE to NW.Appeared, to visual
observation, to be aligned with a prominent but narrow dark break in the
illuminated eastern rim of Catharina. When first detected the ray spanned
approximately 75% of the width of Catharina, shrinking to approximately 50%
by the end of the observation.
Clear Skies!
James Greengrass
The longitude and latitude of Kingston, Ontario are: 76o 30' W and 44o 16' N , respectively
Starting Date = 2003/7/1 at 00:00 U.T.
Site Longitude = +76.500
Site Latitude = +44.270
Feature = CATHARINA
Feature Longitude: = +23.600
Feature Latitude: = -18.000
Reproducing Lighting For: 2003/7/19 at 09:00 U.T.
Desired Solar Altitude = +2.170(Setting), Azimuth = +272.154
Average Co-longitude = 154.119
In the Time column, D=Daylight, T=Twilight
---- Moon's ---- -- Earth's --
Topocentric Topocentric -------- Sun's --------
UT Date Time Alt° Semi-Diam'' Long° Lat° Colong° Lat° Azim°
2003/07/19 09:00T +42.956 917.38 +4.814 +5.961 153.670 +1.377 +272.154
Catharina - +378,-310: A great but somewhat irregular walled-plain, about 55 miles in diameter, with broad walls torn by explosions and much deformed by depressions (the largest of which lies on the inner north-west slope, but still attaining 16,000 feet in places. A very prominent valley runs down the inner west slope and is, in part, a crater-chain. The outer north-west slope is altogether deformed by valleys and a mass of depressions, intruding upon wah other. The crest of the wall on the south-east and south is disturbed by small craters; on the outer slopes, among numerous craters, is the ring C connected to Polybius by a ridge and to Catharina by a valley. - Wilkins and Moore, The Moon, Faber & Faber, 1955