The Details
Object
NGC 246 in Cetus
Optics
Celestron C-14 at f/6.9
Platform
Astro-Physics 1200 GTO
Camera
SBIG ST-8XE
Filters
SBIG LRGB filter set
Date
11 September 2002
Location
Figueroa Mountain Lookout, Santa Barbara County, CA
Exposure
L 7 x 300 sec 1x1 bin; RG 2 x 300 sec, B 2 x 480 sec 2x2 bin
Software
Maxim DL/CCD, Registar, Photoshop CS
Orientation
Field of View: 11’40" x 07’52" centered on RA 00h47m20s
DEC -11°51’04”. North angle 181.17 °; east 90° CCW from north
Notes
This seldom imaged planetary nebula in Cetus is 1800 light years from earth. Notice in the above image that the central star of this nebula seems to be elongated in the 2:30 o'clock position. In actuality, the central star is known to be one component of a binary system based on the observed common proper motion and radial velocity of the two stars. The secondary star has been captured on the above image as that noted elongation. Designated as CUD 1 for its discoverer, Kyle M. Cudworth of UC Santa Cruz, the following details were determined by him using the Lick 36" refractor in 1973 and published in the PASP, Vol. 85, page 401, August 1973.
Vm Primary = 11.9
Vm Secondary = 14.3
PA = 129°
Angular separation = 3.8"
Actual separation = 1640 astronomical units.

The delicate structure and beautiful color of this planetary make it one of my favorite deep sky objects.

 

 

 

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