Archimedes' Shadow

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Archimedes' Shadow

Postby Aratus » Sun May 15, 2016 11:06 pm

On Saturday 15th May I tried to take some close ups of some lunar features using a barlow lens. As expected the results were rather patchy as the seeing during such close ups disrupts the imaging.
Here is one reasonable image of the crater Archimedes. (Diameter 52 miles) The sun shining on the rim of the crater casts a shadow on the flat crater floor. The shape of the shadow gives some idea of the features that might be found on the rim.

With a bit of processing to straighten out the shadow - and making a negative image, it gives some idea of what the rim would look like to an observer standing outside the crater.

Incidentally, the crater in the top right hand corner, Aristillus, shows 5 of its peaks in a circle. Better telescopes than mine have shown up to 7 peaks.
I use an 11" reflector (Celestron CPC 1100) and a 3" refractor, (Sky-Watcher ST80) mounted on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI 120MM, ZWO ASI1600MC and Canon 1300D for imaging.
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