From: Martin Shough <parcellular.nul>
Date: Sat, 19 May 2012 16:20:43 +0100
Archived: Sat, 19 May 2012 12:05:46 -0400
Subject: Re: Unusual Craft Over Reading, England


>From: William Treurniet <wtreurniet.nul>
>To: post.nul
>Date: Fri, 18 May 2012 20:03:54 -0400
>Subject: Unusual Craft Over Reading, England

<snip>

>This object seems to be at a relatively low altitude, and is
>somewhat spherical in shape. There appears to be a black band
>separating two whitish hemispheres. Occasionally, the white
>changes to a cyan color.

<snip>

>I posted the clip at the following location:

>http://tinyurl.com/d6lboud

>Can anyone identify this object?

One possibility is a drifting soap bubble.

A transparent bubble typically shows an "upright" reflection of
the environment in one hemisphere and an "inverted" reflection
of the same scene in the other. The reflection is an extremely
wide angle or fish-eye type image, like an all-sky camera.
Against a bright sky you will often see two such reflections of
the sky separated by a darker band which is the horizon (check
Google images for "soap bubble reflection").

If you can find the pointing angle of the camera relative to the
local horizon you might be able to prove this to your
satisfaction by ray tracing, or you could ask your friend to try
photographing a detergent bubble in the same location and
conditions.

Further, with some camera data such as angular FOV and lens
hyperfocal distance, and local weather records, you could put
some limits on distance, angular size, angular rate, true rate
and direction that would help to test the hypothesis.


Martin Shough




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