May 28, 2011

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Changing Color

images by Tamás Ábrahám, Zsámbék, Hungary

Continuing our considerations of the colorfastness of the Moon, note how its brightness and hue change as it rises. This effect, of course, is due to absorption of light by the atmosphere, which is densest at the horizon because of the long path length, and thins and has less effect as the Moon rises higher in the sky. And in Tamás' images, clouds, not just the transparent atmosphere, also degrade the Moon's brightness and color. As shown yesterday, the color of surfaces varies depending on the actual nature of a surface, observing conditions and data processing. Astronomers have long known this and are very careful to standardize observing conditions and analysis to achieve accurate and consistent results. As amateurs we can be more free to depict the Moon and the rest of the universe accurately or not. Tamás' images are probably quite accurate renditions of the changing appearance of the Moon, but not the actual color and brightness of the Moon. And that is OK.

Chuck Wood

Technical Details
05.18.2011, 20:04 - 20:22 (UT). 8" newtonian reflector (F/5) + Canon EOS 400D camera. The photos were taken from Tamás' backyard.

Related Links
Tamás' website

Yesterday's LPOD: From Lavas To Wagtails

Tomorrow's LPOD: A Wetter Moon


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