[AZ-Observing] Re: Comet 17/PHolmes - Swan Band filter
- From: Brian Skiff <bas@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Fri, 26 Oct 2007 11:44:14 -0700 (MST)
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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