File:Venus Transit Black Drop Effect with LG Lucid Droid 8366 (7158076495).jpg

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Hand-holding a Droid smartphone over an eyepiece is not the best way in the world to get an astrophoto, but it sometimes works!

This is almost precisely at Second Contact (complete ingress phase) of the Venus Transit of 2012. Notice how the edge of the sun and the adjacent edge of Venus seem to reach out and "grab" each other? That's called the black drop effect.

Historically, this effect was taken as "proof" that Venus has a thick atmosphere, however it is now generally thought to be an optical illusion due to contrast and optical system limitations.

Here's a drawing as depicted by Torbern Bergman in 1761 (from Wikipedia):

<a href="http://en.wikipedia.org/wiki/File:Venus_Black_Drop_effect.png" rel="nofollow">en.wikipedia.org/wiki/File:Venus_Black_Drop_effect.png</a>

The telescope was the 15" refractor at Comanche Springs Astronomy Campus and the filter was a Baader Turbo Solar Film 10" filter over the front aperture.
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Source Venus Transit Black Drop Effect with LG Lucid Droid 8366
Author Jeff Barton from Richardson, TX, USA

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This image was originally posted to Flickr by chipdatajeffb at https://flickr.com/photos/79653922@N00/7158076495 (archive). It was reviewed on 25 September 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

25 September 2018

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current08:32, 25 September 2018Thumbnail for version as of 08:32, 25 September 2018940 × 660 (38 KB)PlanetUser (talk | contribs)Transferred from Flickr via #flickr2commons

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