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Index of Subjects Given that Delta Gem is a brighter star, I'm pretty sure that what you are seeing is an Airy disk, caused by the wave nature of light. https://en.m.wikipedia.org/wiki/Airy_disk Pat Sent from my iPad > On Jul 27, 2015, at 8:11 PM, "David & Alison Webster" <dwebster@glinx.com> wrote: > > Dear All & especially Astronomy fans, July 27, 2015 > While going through old National Geographic Magazines I came across a reproduction of Clyde W. Tombaugh's plate which led to his discovery of Pluto (N.G. 138 (Aug 1970):191). > > On this plate, Pluto is just a tiny dot but what caught my eye was a haze-free field concentric around a star (Delta Geminorum) and with a crisp perimeter encased in a relatively wide haze halo that gradually fades to background. > > I am wondering if this is some kind of artifact. If so how does it come about ? And if not what does it represent ? > > If anyone is prepared to look at this file let me know. > > Also is it legal to post copyrighted images, such as this, on internet sites without authorization ? > > Yt, Dave Webster, Kentville > > I have this image in a PDF file (only 555 kb) but am wary, for copyright reasons, of posting it on Flickr.
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