January 11, 2011

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Three Suns And Two Moons

LPOD-Jan11-11.jpg

solar images and composite by Peter Rosén, Stockholm, Sweden, and lunar eclipse image by Johannes Schedler

During the recent partial solar Peter Rosén

LPOD-Jan11b-11.jpg

Technical Details
Solar images: The eclipse of the sun started before sunrise but the sun did not emerge from behind the clouds until 8h16 UT. The 3 composited pictures of the eclipse make up a portrait of the transiting moon. Not much is missing. The first picture was taken at 8h23' UT, the second shows the crescent at the maximum of 85% at 8h41', just a little bellow the theoretical maximum of 86% visible in the north of Sweden. The 3rd picture was taken at 9h07' UT just before the clouds started coming back and completely obstructed the view a little later. I used a William Optics FLT-110 at f/6,5 with a solar filter and also a Canon Eos-40D for the eclipsed sun. To get the correct orientation of the moon, I made a simulation using Starry Night Pro Plus version 6.4.1. In making this composite I had to flatten the Moon to compensate for the atmospheric refraction of the low altitude sun, only 3.3° versus 18° for the eclipsed Moon.
Lunar eclipse image: Feb 21, 2008. TEC-140 with TEC flattener at f/7. Canon 40D: 4 x 3 sec at ISO 200 for eclipsed Moon.

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