Lunar X

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File:Lunar-x.jpg
Lunar X formation taken January 30, 2012, the formation is off the center towards the right
File:LunarX-LunarV-29Mai2020-Hristina.jpg
Lunar X and Lunar V recorded on a Skywatcher 150/750 with a ASI294MC Pro on May 29, 2020, in Mainz, Germany

The Lunar X (also known as the Werner X) is a clair-obscur effect in which light and shadow creates the appearance of a letter 'X' on the rim of the Blanchinus, La Caille and Purbach craters of the Moon.[1]

The X is visible only for a few hours before the first quarter,[2][3] slightly below the lunar terminator. Near to the X, the Lunar V is also visible, formed by Ukert crater and several other small craters.[2]

File:Half waxing moon with inset closeup of point X.jpg
Half waxing moon with inset closeup of Lunar X, used by a 60mm refractor telescope

References

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External links

  • LPOD articles:
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  • APOD articles:
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    • Script error: No such module "citation/CS1". - also includes the Lunar V


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