Umbral Shadow ... unveiled

Posted by ayiomamitis
on Tuesday, July 14, 2009

by Anthony Ayiomamitis

 

Although total lunar eclipses are stunning events, partial eclipses involving the earth's penumbra and umbra are often considered non-events and not worthy of observation since the minute changes in the apparent magnitude of the moon are barely visible to the ground-based observer. However, as indicated by this image (at eclipse maximum), even a partial eclipse can provide an impressive visual display and especially involving the umbral shadow and which represents the cone of shadow cast by earth into space which the partially eclipsed moon passed through on this particular occasions. Technical Details: Date: Aug 16-17, 2008 @ 22:30:00 - 01:50:00 UT+3 Location: Athens, Greece (38.2997° N, 23.7430° E) Equipment: AP 160 f/7.5 StarFire EDF, AP 1200GTO GEM, Canon EOS 300D Exposures: 9 x (1/250 - 1/30 sec), ISO 200, RAW image format, 3072x2048 image size, Manual Mode Further details: http://www.perseus.gr/Astro-Eclipses-2008-08-16b.htm

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