Astro-Drawings 2001

by Gerhard Niklasch

The Moon

Aristarchus area

Aristarchus area

with Aristarchus top left, Herodotus top center, Vallis Schröteri below it, Mons Herodotus just below and right of center, and Montes Agricola forming the diagonal ridge from bottom center to right center (Rükl chart 18). There is only a short time during each lunation with favorable illumination on Montes Agricola; soon after, the exceedingly bright inner walls of Aristarchus will drown out the entire area in their glare. Note Aristarchus Z (small crater on what appeared as a gentle hill N of Aristarchus) und Väisälä (an even smaller crater to the left of it). Rupes and Rimae Toscanelli were not seen (and/or didn't attract my attention), nor Dorsum Niggli which should be just S of the largest hill of Montes Agricola. Aristarchus was visibly gaining in brightness while I was sketching.

Compare this drawing to the one made in evening light later during the same lunation.

Drawn 2001 August 2, 01:00-01:50 MEST (August 1, 23:00-23:50 UT), JD2452123.46
Moon age: 12.15 days, sunrise longitude 299°22', subsolar latitude +0°54'
Libration: long.+4°13', lat.+1°05', limb angle 284°30', tilt 4°.348

Instrument: 8" f/5 Newton, Powermate 2.5× Baader ND0.9 filter; Meade UWA 8.8mm and Takahashi LE 7.5mm (magnification c.283× and 320×, respectively - using the LE in 0".965 mode decreases the Powermate's magnification a little)

G. Niklasch / Fri, 17 Aug 2001 06:05:19 MEST