[AZ-Observing] Re: Comet 17/PHolmes - Swan Band filter
- From: Chris Schur <comets133@xxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Fri, 26 Oct 2007 11:04:45 -0700 (PDT)
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
>
> --
> See message header for info on list archives or
> unsubscribing, and please
> send personal replies to the author, not the list.
>
>
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
--
See message header for info on list archives or unsubscribing, and please
send personal replies to the author, not the list.
Other related posts:
