[AZ-Observing] Re: Comet 17/PHolmes - Swan Band filter

Odd that visually the OIII and Swan Band filter increased contrast  
given its apparent dust content.  What are your thought on this, Brian?

-FRANK


On Oct 26, 2007, at 11:44 AM, Brian Skiff wrote:

>      Thanks for showing us that spectrum (and taking it, Keith!).
> This is a completely bland solar spectrum.  If there were any emission
> to be detected visually, there would have to be a big broad
> C2 emission band around 5100A, just right of H-beta in Keith's
> spectrum.
>      The yellowish color that everyone has been seeing is
> indicative of a straight reflection spectrum; you'd expect reports
> of turquoise-blue/green if the comet was gassy.  This is consistent
> also with the outburst being basically a lot of dust coming from
> the comet; if it was a gassy event, I'm pretty sure the light
> distribution would be more nearly 1/radius (falling off smoothly
> in brightness) rather than having the more-or-less well-defined
> shells like we're seeing.
>
> \Brian
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