2010 08 29 Rima Hyginus

2010 08 29, 0820 UT Rima Hyginus
PCW Memorial Observatory, OH, USA, Erika Rix
Zhumell 16”, 20mm TV, 5x Barlow, 450x mag, 13% T moon filter
Temp: 12.8C, >90% humidity, S: Antoniadi I
Sketch created scopeside with Rite in the Rain paper and charcoal.

Phase: 307.3°
Lunation: 19.38d
Illumination: 80.3%
Lib. Lat: -6°04’
Lib. Long: -6°03’
Az: 260°08’, Alt: 34°57’

Rima Hyginus: Linear Rille, 7° E, 7.5° N
Imbrian period (-3.8 billion yrs to –3.2 billion yrs)
Dimension: ~226 km, Height: unknown
Named after Caius Julius Hyginus, 2nd century BC Greek Astronomer

LPOD 2004-02-25, by Chuck Wood

“The key to understanding the origin of Hyginus is probably the small pit craters visible in the rille on the northwest (left) side of Hyginus. These pits almost certainly formed by collapse of the roof over a lava tube.”

A lot of the features were washed out surrounding the rille, but the flat floor of Hyginus was evident as well as its irregular shape. I could make out some of the pits to the northwest half of the rille and a couple hints of the craterlets (or pits) to the southeast half. The subtle variances in albedo were difficult to render, however, interesting to observe. If I remember correctly, the dark patch to the north of H consists of volcanic ash.

While searching for information on this rille, I came across yet another amazing image from Wes Higgins. The pits Chuck Wood wrote about in the article above are clearly shown. Rima Hyginus 2007-08-03, by Wes Higgins

Resources
Rukl plate 34
“The Modern Moon” by C. Wood pgs. 58-59
LPOD Thumbnails of Rima Hyginus
Virtual Moon Atlas

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~ by Erika Rix on August 29, 2010.

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