Mare Humboldtianum

Sketching and Equipment:
For this sketch I used: black 6” x 8” sketch pad, white and black Conte’
Pastel pencils and a blending stump , White Pearl eraser.
Telescope: 10 inch f/ 5.7 Dobsonian and 6mm eyepiece 241x and an equatorial platform
Date: 12-01-2019 1.10 - 2:30 UT
Temperature: 13°C (55°F)
Clear, calm
Seeing: Antoniadi III
Transparency: 4/5
Lunation: 4.13 days
Illumination: 18.4%
Libration in Longitude +04° 58’
Frank