September 29, 2013

ALMOST MICROGEOLOGY

LPOD-Sept29-13.jpg
image by George Tarsoudis, Greece

It used to be that there were professional astronomers and amateurs. But now, with this image and others that LPOD has featured recently,
there is only excellent imaging, whether from a giant telescope, a backyard one or an orbiting camera. I am amazed to see a terrestrial image
of this scale and quality. The dramatic lighting highlights the ejecta from Theophilus, with the smooth impact melt ponds just north of the
crater's rim. Also very conspicuous is a small rille that looks like a twig with branches at the top end. This has been imaged before but it is
more distinctive here.
LPOD-Sept29b-13.jpg
The rille also crosses a circular rise that George proposes is a
megadome similar to the Valentine Dome. The dome (outlined
in red) is undetectable in the image due to the distractions of
Theophilus' ejecta, but using LRO QuickMap elevations George
found that it is roughly 85 km wide and 300-400 m high. The
existence of the dome may explain the location of the rille. Few
rilles occur in this area, but a rille does cross the Valentine
Dome so this may be a similar feature.

Chuck Wood

Technical Details
Sept 25, 2013, 00:38:33 UT. Telescope SkyWatcher 14 inch
@f/4.5, camera Unibrain Fire-i 785, filter red.

Related Links
21st Century Atlas chart 7.
George's website

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