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

Chris, I hope you can get something to show up.  I won't have time tonight,
but may give it another try tomorrow night.  Maybe my backyard or a little
north of aurora Phoenicis.

Clear skies and good imaging,
aj

----- Original Message ----- 
From: "Chris Schur" <comets133@xxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Friday, October 26, 2007 11:04 AM
Subject: [AZ-Observing] Re: Comet 17/PHolmes - Swan Band filter


Aj, I have a 48mm swan band filter, Ill try to get
images of the comet with the CCD and well see whats
out there!

Chris
--- AJ Crayon <acrayon@xxxxxxx> wrote:

> In response to Frank Uralic's request for anyone
> using this kind of filter I can respond to a yes I
> have and did so last night, Thursday.  Steve Coe, a
> full moon, some bright yard lights and I were out
> north of Scottsdale, AZ with my 8" SCT at about
> 145X.  Without the filter this is a magnificent, yet
> mysterious, comet.  Don't know what I can supply for
> an observation that hasn't been said before.  Yes it
> does have obvious planetary nebula like features.
> It is round, large, bright with an extremely
> brighter coma and a stellar nucleus that is offset
> from the coma.  I didn't attempt to measure its
> position.  With the Swan Band there is a much
> fainter fan shaped halo of about 1/2 again larger
> than the entire comet.  A surprise to me as this
> hasn't shown up in Jeremy Perez's excellent drawings
> nor any of the astroimages.  The comet was at about
> the focus of the halo, which is about where one
> would be expected.  Unfortunately I didn't try to
> measure the position angle so can't sa
>  y much about that.
> The Swan Band filter is supposed to make comets that
> consist mostly of gas brighter and those mostly of
> dust fainter.  So my suspicion is there is a little
> more gas than dust.  Yet, other than the halo, never
> did we see any hint of a tail.
>
> Hope this helps.
>
> Clear skies,
> AJ Crayon
>
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>


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