Re: [APML] OT: cat with a mane

["Richard Crisp" <rdcrisp@earthlink.net>]

thanks Rob, I just wish I could have had the nights of good seeing needed to 
capture the other emission lines

it may still happen but it is transiting about 9pm now so it is waning for 
sure.


----- Original Message ----- 
From: "Robert Gendler" <robgendler@worldnet.att.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, August 13, 2005 6:52 PM
Subject: Re: [APML] OT: cat with a mane


> Wow Richard, thats very impressive. Certainly well worth the time spent.
>
> Rob Gendler
> email: robgendler@att.net
> Web Site: http://www.robgendlerastropics.com
> ----- Original Message ----- 
> From: "Stuart Heggie" <Stuart.J.Heggie@sympatico.ca>
> To: "Richard Crisp" <rdcrisp@earthlink.net>; "Discussion of Film
> Astrophotography" <astro-photo@seds.org>
> Sent: Saturday, August 13, 2005 7:53 PM
> Subject: Re: [APML] OT: cat with a mane
>
>
> Richard, great detail! It is unfortunate that we'll have to wait for the
> finale but I know it will be worth it.
>
> Stuart
>  ----- Original Message ----- 
>  From: Richard Crisp
>  To: Discussion of Film Astrophotography
>  Sent: Saturday, August 13, 2005 7:49 PM
>  Subject: [APML] OT: cat with a mane
>
>
>  this is one of those projects I don't expect to complete this season due
> to the current sky positon of the Cat's eye (NGC6543)
>
>  Some time back I decided to attack this target with the mighty 18" f/12.6
> Cassegrain with the goal of taking a tricolor or quad color emission line
> image.
>
>  I don't think I am going to get the Ha and Sulfur data to finish up this
> very difficult target this season so I am going to post the [OIII] data I
> lready have.
>
>  For those of you that have tried to image the Cat's Eye Nebula (NGC6543)
> you  know that it has a bright core that is very tiny. What some may not
> realize is there's a spectacular outer halo surrounding it. I have only 
> seen
> one amateur image that caught it and it was from Stan Moore taken in dark
> skies using fast broadband filters. I am using a narrowband [OIII] so the
> problem is compounded significantly with the bright backyard sky and the
> slow focal ratio and the narrowband filter.
>
>  This was shot from my backyard using 10 minute exposures. any longer and 
> I
> would have saturated the core
>
>  I shot this at 5760mm focal length, at f/12.6 in the 18" cass.
>
>  The processing was very challenging primarily because I wanted to retain
> the integrity of the fine features of the core but at the same time wanted
> to show the enormous halo surrounding it. As a result the background in 
> the
> outer halo is rather grainy.
>
>  I have a total of 22 exposures of 10 minutes stacked. The exposures were
> binned 2x2 yielding an image scale of 0.64 arc-sec/pixel.
>
>  I expanded the image to 2x the linear size once captured for the
> processing.
>
>
> http://www.narrowbandimaging.com/ngc6543_cat_rdsc18_6303_ado3_22x10min_page.htm
>
>
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