[AZ-Observing] Re: Fun with M1

Paul, you may find this interesting:

http://www.schursastrophotography.com/ccdimagepages/m1polarized.html

Chris
--- L Knauth <Knauth@xxxxxxx> wrote:

> While out observing at Hovatter North Tuesday night,
> I observed M1 through clip-on polarized sun glasses
> that I would swing back and forth at 90 degrees. 
> The Crab is emitting polarized light from
> synchrotron radiation, so parts of it blink at you
> when doing this trick.  I have shown this to people
> for years through my 12.5", but the polaroids eat up
> so much of the light that some couldn't see it very
> well.  Through my 25" Obsession, it is easy.  I
> think you could see it with a 10" at  dark sky site,
> especially if you cover yourself in a dark cloth to
> keep ambient light reflections off the polaroids.
> Try it sometime.  
> The normally elongated blur becomes nearly circular
> through the polaroids (outer region light loss) and
> the brightest "blinking" occurs on one side
> perpendicular to the axis of elongation. I think it
> is the north side.  Too bad there is no rotating
> polaroid holder that would make this easier.
> 
> Paul Knauth
> 
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