The Palus Epidemarium Double Ray

Initial Reports

Palus Epidemarium Double Ray (as reported by Akkana Peck)
8/20/99 at 10:30pm PDT, at the SJAA public star party at Houge Park, we were entranced by a lovely pair of rays in Palus Epidemiarum. I made this sketch with my VX102 refractor (then flipped it later to match with the map view), but in a nearby 10" reflector, interesting detail was visible, barely illuminated by the rays, on the floor of Palus Epidemiarum.

The Initial Predictions, Using Data in Original Reporting

Akkana's date and time reported was 8/20/99 @ 10:30PDT. This converts to 8/21/99 at 5:30 hours UT date and time. The initial predictions show the desired solar altitude was -3.198 rising. The initial predictions show:

Feature Longitude: = -28.200
Feature  Latitude: = -32.000

Reproducing Lighting For: 1999/8/21 at 05:30 U.T.

Desired Solar Altitude =  -3.198(Rising),  Azimuth = +91.524
Average Co-longitude =  24.428
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°

  1999/08/21  05:30   +13.640    897.06    -1.440  -4.626    024.680   +0.404  +91.524

Crater Description:

Epidemiarum Pallus, -380 -480 to -460 -580; A small dark plain to the east of Cichus, and transversed by the Ramsden cleft system, with many hills and craterlets on its surface. Mercator and Campanus limit it on the north, Capuanus and Elger on the south, and Cichus on the west. - Wilkins and Moore, The Moon, Faber and Faber, 1955

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