Difference between revisions of "May 30, 2007"

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=Two Views in One=
 
=Two Views in One=
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<p>[[File:Pepel_svet_copy1.jpg|pepel_svet_copy1.jpg" height="680" width="1024]]<br />
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<p>[[File:Pepel_svet_copy1.jpg|pepel_svet_copy1.jpg" height="680" width="1024]]<br />
 
 
<em>image by [mailto:www@yarmarka-ryazan.ru Yuri Gilev], Ryazan, Russia</em></p>
 
<em>image by [mailto:www@yarmarka-ryazan.ru Yuri Gilev], Ryazan, Russia</em></p>
 
<p>The Moon ranges in brightness more than most other astronomical bodies and hence is difficult to image all of it at any one time. One of the greatest brightness ranges occurs when the Moon is a thin crescent - a sliver of brightness bordered by a faint roundness of Earthshine. Typically, a short exposure captures the Sun-illuminated crescent against a blackness of the rest of the Moon. Or a long exposure brings out the Earthshine, making the rest an over-exposed crescentic blob. Yuri, in the midst of a public observing session, took 14 frames, half exposed for the crescent and the rest for the Earthshine. By clever digital darkrooming he merged them at the terminator to produce a realistic but impossible view. I wonder what the greatest phase is where there is still enough Earthshine to image the dark portion of the Earth-facing Moon.</p>
 
<p>The Moon ranges in brightness more than most other astronomical bodies and hence is difficult to image all of it at any one time. One of the greatest brightness ranges occurs when the Moon is a thin crescent - a sliver of brightness bordered by a faint roundness of Earthshine. Typically, a short exposure captures the Sun-illuminated crescent against a blackness of the rest of the Moon. Or a long exposure brings out the Earthshine, making the rest an over-exposed crescentic blob. Yuri, in the midst of a public observing session, took 14 frames, half exposed for the crescent and the rest for the Earthshine. By clever digital darkrooming he merged them at the terminator to produce a realistic but impossible view. I wonder what the greatest phase is where there is still enough Earthshine to image the dark portion of the Earth-facing Moon.</p>
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<div align="center">Don’t forget to add yourself - as I have done - to the growing list of lunatics at [http://www.lpod.org/?m=20070509 Frappr LPOD]!
 
<div align="center">Don’t forget to add yourself - as I have done - to the growing list of lunatics at [http://www.lpod.org/?m=20070509 Frappr LPOD]!
 
<p><em>LPOD earns a commision when you buy ANY book from Amazon thru [[LPOD]] Have you bought a book lately?</em><div>
 
<p><em>LPOD earns a commision when you buy ANY book from Amazon thru [[LPOD]] Have you bought a book lately?</em><div>
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===COMMENTS?===  
 
===COMMENTS?===  
 
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.
 
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.

Revision as of 18:53, 4 January 2015

Two Views in One

pepel_svet_copy1.jpg" height="680" width="1024
image by Yuri Gilev, Ryazan, Russia

The Moon ranges in brightness more than most other astronomical bodies and hence is difficult to image all of it at any one time. One of the greatest brightness ranges occurs when the Moon is a thin crescent - a sliver of brightness bordered by a faint roundness of Earthshine. Typically, a short exposure captures the Sun-illuminated crescent against a blackness of the rest of the Moon. Or a long exposure brings out the Earthshine, making the rest an over-exposed crescentic blob. Yuri, in the midst of a public observing session, took 14 frames, half exposed for the crescent and the rest for the Earthshine. By clever digital darkrooming he merged them at the terminator to produce a realistic but impossible view. I wonder what the greatest phase is where there is still enough Earthshine to image the dark portion of the Earth-facing Moon.

Chuck Wood

Technical Details:
19 may 2007 during international sidewalk astronomy night action in Ryazan, Russia. SkyWatcher 80ED + Canon 350D. 7 frames @ 1/15s + 7 frames @ 8s, ISO100. Stacking in IRIS, HDR in Photoshop.

Related Links:
An earlier merger
Maximum Earthshine

Don’t forget to add yourself - as I have done - to the growing list of lunatics at Frappr LPOD!

LPOD earns a commision when you buy ANY book from Amazon thru LPOD Have you bought a book lately?

COMMENTS?

Click on this icon File:PostIcon.jpg at the upper right to post a comment.

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