[AZ-Observing] Re: Comet Kushida Last Night
- From: Chris Schur <comets133@xxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 2 Feb 2009 19:15:05 -0800 (PST)
Stan, those are the blades of the iris with t he lens stopped down to f/ 5.6.
They cause more spikes on the stars than a telescope which has up to 4 vanes.
Chris
--- On Mon, 2/2/09, stanlep@xxxxxxxxxxxxx <stanlep@xxxxxxxxxxxxx> wrote:
From: stanlep@xxxxxxxxxxxxx <stanlep@xxxxxxxxxxxxx>
Subject: [AZ-Observing] Re: Comet Kushida Last Night
To: az-observing@xxxxxxxxxxxxx
Date: Monday, February 2, 2009, 7:59 PM
Sure is a small thing.
You probably explained this in the past, but why do the stars have 8
spikes each, that widen radially away from the center of the star images?
It is quite a large widening, more than I have seen in telescopes I have
looked through.
Stan
> HI all,
>
> Youll like this shot, the comet was at its brightest and smack dab right
> in the exact center of the Hyades star cluster! What a stunning sight
> despite the first quarter moon being near by and some occasional strong
> winds. While the comet is without a tail, its striking green color really
> sets of off from the yellow and red star cluster members. What do you
> think?
>
> http://www.schursastrophotography.com/xtiastro/kushida020109.html
>
> Chris
>
>
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>
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