[NatureNS] Pluto

From: David & Alison Webster <dwebster@glinx.com>
To: naturens@chebucto.ns.ca
References: <720167EECD5947A88CC068B13C633CD6@D58WQPH1>
Date: Mon, 27 Jul 2015 21:17:18 -0300
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Thanks for the key word & URL Patrick.

----- Original Message ----- 
From: "Patrick Kelly" <Patrick.Kelly@Dal.Ca>
To: <naturens@chebucto.ns.ca>
Sent: Monday, July 27, 2015 8:24 PM
Subject: Re: [NatureNS] Pluto


> 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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