The Gruithuisen Domes Delta and Gamma

Sketching and Equipment:
For this sketch, I used black Strathmore 400 Artagain paper 8” x 12”, white and
black Conte’ pastel pencils and blending stumps white Pearl eraser.
Telescope: 10 inch f/5.7 Dobsonian riding on an equatorial platform and 4mm eyepiece (362x) and 6mm ortho. eyepiece (241x)
Date: 10-17-2021, time: 03:24 -05:00 UT
Temperature: 27° C (80° F)
Clear, calm
Seeing: Average - Antoniadi III
Transparency: 4/5
Colongitude: 40.6 °
Lunation: 10.4 days
Illumination: 86 %

Frank 5817