LPOD Feb 10, 2008

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image by Howard Eskildsen

As soon as I started seriously observing the full moon, I noticed this strange, bright-albedo feature east of Arzachel and wondered what possibly could have caused it. It is stands out at high sun angles, even at low power views of the full moon, and I was surprised that I had never seen it mentioned before. Later, I ran across a couple of references that suggest that it is a lunar swirl associated with a magnetic anomaly. It appears to have been first described as the "Airy Swirl" in a short 2006 paper by Hughes, Blewett, Hawke, and Richmond. White arrows on the labeled photo point to the bright margins of the swirl and the dark arrow points to the dark lane between the bright features. This area is truly intriguing and deserves further study.

Howard Eskildsen

Technical Details
Dec 21, 2007, 23:49 UDT, Meade 6" f/8 refractor, 2X Barlow, Orion StarShoot II, Seeing 5/10, Clarity 4/6
Argelander D is the small bright crater near the center of the image.

Related Links
Rükl plates 55 & 56

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