[Atmob-discuss] [AAVSO-DIS] Comet Holmes tonight (10/30), jet embedded in fan area

[Mario Motta]

Hi Shawn, nice image.
Mine is North down, and west to left.
This "jet" has never moved all week, not rotating, so unlike Hale Bopp and
others where I and many others watched a rotating jet spin around, I think
we are just seeing a "tail" extending backwards, and foreshortened from our
perspective. (Comet moving directly away from us currently).

Mario Motta

On 11/1/07, Shawn Dvorak <sdvorak at rollinghillsobs.org> wrote:
>
>  Mario Motta wrote:
>
> This is a link to image of Holmes with minor processing with curves,
> shows a jet embedded in the fan area of the comet.
> 25 10 sec images stacked through the 32 inch telescope,
> Mario Motta
>
> http://www.atmob.org/gallery/showimage.php?id=719
>
> Mario E. Motta wrote:
>
>
>  This gets any bigger, I am gonna need a bigger CCD chip! Measures about
> 14 arc minutes now. Still growing.
> Taken at 11:30pm 11/30/07 with the 32 inch scope (4800mm focal length)
> and my SBIG STL 1001E camera. 25 10 sec exposures combined.  Link to image:
>
> http://www.atmob.org/gallery/showgallery.php?id=43
>
> Been said it looks like a planetary nebula. Tonight looking like a
> focault test mirror image, well undercorrected!
>
> Mario Motta
>
> _______________________________________________
> Atmob-discuss mailing list
> Atmob-discuss at atmob.orghttp://lists.atmob.org/mailman/listinfo/atmob-discuss
>
>
>      _______________________________________________
>
> Aavso-discussion mailing list
> Aavso-discussion at mira.aavso.orghttp://mira.aavso.org/mailman/listinfo/aavso-discussion
>
>
>    I finally got a somewhat clear night last night (it was looking like I
> was going to get shut out of the Comet Holmes fun) and saw much the same jet
> that Mario imaged.  This is a false-color composite of (31) 5-second
> unfiltered images with the 10" and SBIG ST-9:
> http://www.rollinghillsobs.org/images/P-Holmes.html.   North is at the top
> and east to the left and the field is 17' wide.
>
> The nucleus is the white area in the upper-right area at the center of the
> comet, while the "jet" trails off to the lower left.  Mario: what was the
> orientation on your image?   The jet in my image is orientated to the
> southwest of the nucleus, at approximately PA 135 degrees.  The comet is
> relatively symmetric radially, though there's a faint fan in the same
> direction as the jet (to the southwest).
>
> Using a 12" aperture and an 80" annulus immediately surrounding the
> aperture I measured the nucleus' brightness at CCDR ~ 9.7, using r ~ 9.4for  the comparison star TYC 3334-0180-1 (mV=
> 10.11, B-V=1.48).
>
> Shawn Dvorak
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.atmob.org/pipermail/atmob-discuss/attachments/20071101/4e7642ff/attachment.html