The Straight Wall
Sunrise on the 8-day moon, and the base of
the steeply sloped Rupes Recta fault (top, left
of center) is a boldly etched dark black
shadow, earning it the title "The Straight
Wall". As the sun rises higher, the shadows
are lost, but the feature will re-appear sixteen
days later (24 day moon), as the sun strikes
the face of the wall, this time transforming it
into a gleaming white scarp.
Many features are seen in greatest detail as
the terminator sweeps by, accentuating their
contours with the long shadows that are cast.
The northern stretch of the terminator was also imaged during this session, and spans the Mare Imbrium area.
These shots are from a single one-second ISO 100, 48-bit image that was taken on 09-Feb-2003 with an 8" Mak-Newt and Canon
D60 digital SLR through a stacked pair of TeleVue Powermates (2x and 4x). The original image is 3072 x 2048 pixels, these
images have been rotated 90 deg CW and reduced to 450 x 400 and 550 x 825 respectively.
Processing done in Images Plus and final polish with Adobe PhotoShop.
The cropped inset below reveals more detail
around the Wall, with wrinkle ridges in the
adjacent Mare completing a near perfect circle
with the surrounding highlands and hinting at
a possible early impact at the site. Abundant
smaller impacts occured later in the area's
development. The triple crater formation
Thebit lies on the Eastern wall, with yet
another smaller circular pattern extending to
the Wall, with Purbach H at the southernmost