Waxing Crescent Moon Tonight

January 20, 2010 20:14 by scibuff

Originally, I planned to continue my ISS above London series although now it would be renamed to ISS above Amsterdam. Unfortunately, I missed tonight’s fly over between 17:41:57 and 17:48:47 GMT when the ISS passed only a few degrees south of the Moon.

Fortunately, freezing out on the roof terrace wasn’t a complete waste of time as I managed to take the following shot of the crescent Moon [click to embiggen].

Waxing Crescent Moon tonight

Photo of waxing crescent Moon taken tonight through a refractor ATC Monar (D=70mm f/4.6) with Canon 450D, exp. 1/50s

In the photo above, 25% of the surface is illuminated. At the time, the Moon was at the distance of 400,438 km only a few hours after reaching the apogee (January 20, 2010 at 14:55 GMT). Chromatic aberration, caused by the failure of the primary lens to focus all colors to the same point due to different refractive index for different wavelengths of light, is noticeable on the edges (green in the bottom left, red in bottom right, and blue in top right) but quite obvious in the original (uncropped) image [~2mb] with the resolution of 4272px x 2848px.

As there is no need for colors in lunar images, I was quite happy to “correct” the chromatic aberration by setting the image [click to embiggen] to gray-scale:

Waxing Crescent Moon (Grayscale)

Grayscale photo of waxing crescent Moon taken tonight (eq and exp. details same as above)

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[…] (Compare the Moon with photos from January 25 and January 20) […]

queen of England

very bad need to improve alot

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