[AZ-Observing] Re: Comet 17/PHolmes - Swan Band filter
- From: "Kolb, George (MCOE)" <George.Kolb@xxxxxxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Fri, 26 Oct 2007 11:45:07 -0700
I got some images of the comet last night. First I tried a webcam but
had much trouble focusing. Contrast was very poor with the milky bright
sky from the moon. Next I tried my DSLR. Better results but nothing to
brag about. Last, I tried my DSI that I use for guiding. It gave the
best results. Again nothing to brag about but it did show some
interesting features of the comet from the 11 to the 3 o'clock position
in the image that I could not see visually through my TEC 140. Has
anyone noticed these chunks during their observations? George
http://www.pbase.com/geokolb/image/87898223/original
http://www.pbase.com/geokolb/image/87898298/original
=20
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of AJ Crayon
Sent: Friday, October 26, 2007 11:27 AM
To: az-observing@xxxxxxxxxxxxx
Subject: [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 -----=20
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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> send personal replies to the author, not the list.
>
>
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