Cup of nectar


Crater Bohnenberger in Eastern Mare Nectaris
From my location, this evening presented the best observing conditions since June
of last year. As the sun set in the west-northwest the crescent moon was riding
about 55° above the horizon, so I spent about hour looking for potential targets
to sketch. Crater Taruntius presented an interesting sketching target with its
central peak and unusual wall but I wanted to sketch closer to the terminator. I
finally settled on crater Bohnenberger just west of the Lunar Pyrenees Mountains
that define the eastern edge of the Sea of Nectar.

Bohnenberger is an old Pre-Imbrium crater 33 km diameter. Bohnenberger has a pair
of broad central peaks, a break in its northern wall and a crater on its western
floor. Crater Bohnenberger A about the same size (30 km) with a bright, shallow,
flat floor can be seen to the south with 12 km crater G between them. Some 100 km
to the west of Bohnenberger A, crater Rosse could be seen among the lunar ridges
in the Sea of Nectar. The high walls of Rosse were brightly lit against the dark
frozen lava of the mare. The dark shallow crater about the same size as Rosse at
the bottom of the sketch is crater Gaudibert H. Within the region of the sketch a
great deal more could be seen but was beyond my ability to record in a reasonable
time as the shadows and light continued to change.
  For this sketch I used: black Strathmore 400 Artagain paper 9”x12”, white and
  black Conte’ pastel pencils and a blending stump.
  Before submitting I changed slightly the contrast using Imageenhance software
  Telesccope: 10 inch f/ 5.7 Dobsonian and 6 mm eyepiece 241X
  Date: 4-22-2007 1:35-2:40 UT
  Temperature: 20° C (69° F)
  Clear, calm
  Seeing:  Antoniadi  I-II
  Colongitude 325.7 °
  Lunation 4.5 days
  Illumination 27.5 %
  Frank McCabe

2 thoughts on “Cup of nectar”

  1. Fantastic! the sensation of the lunar ridges, it seems like real ocean!
    I love it! Frank

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