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Lunar - X

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#1 Heidescoper

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Posted 07 April 2014 - 01:33 AM

hi all,

3-8-2014, 20:30 UT
6" Dobson, f/6 , Bino V 175x

Bye
Christian

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#2 Tamas Bognar

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Posted 07 April 2014 - 01:35 AM

Excellent sketch !

#3 CarlosEH

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Posted 07 April 2014 - 04:20 AM

Christian,

An excellent capture and rendering of the elusive Lunar-X (25.3°S, 0.9°E) clair-obscur (or Chiaroscuro; contrast effect between light and dark regions) optical feature on the Moon that forms a letter X on the rims of the craters Blanchinus, La Caille, and Purbach. It may be observed (depending upon the sun angle) for approximately four hours around the lunar First Quarter.

Links;
https://the-moon.wik...ces.com/Lunar X
http://www.universet...ng-the-lunar-x/

Regards,
Carlos

#4 niteskystargazer

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Posted 07 April 2014 - 03:25 PM

Christian,

Nice sketch of the Lunar "X" :).

CS,KLU,

:thanx:,

Tom

#5 frank5817

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Posted 07 April 2014 - 08:39 PM

Christian,

This is an excellent capture of the Famous X.

Frank :)

#6 Uwe Pilz

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Posted 08 April 2014 - 12:18 AM

I never saw lunar X and I am still waiting for an clear evening with the right lunar illumination. Thank you for sharing it!

#7 geminijk

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Posted 08 April 2014 - 10:38 PM

Great job!

John

#8 Heidescoper

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Posted 09 April 2014 - 06:01 AM

hi all,
thank You for the compliments.
Carlos:
thank You for the explanation ;).I forgot...

Bye
Christian

#9 Chuck Hastorf

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Posted 09 April 2014 - 07:23 AM

Nice sketch, Thanks for posting,

Chuck

#10 kraterkid

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Posted 10 April 2014 - 12:27 PM

Excellent sketch Christian! You had to work quickly to capture this in the rapidly changing light at the terminator. Well done.






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