NGC7293 (also known as The Helix Nebula, or Caldwell 63) is a large planetary nebula located at a distince of about 700 light-years in the constellation Aquarius.  Discovered by Karl Ludwig Harding before 1824, this object is one of the closest to Earth's proximity of all the bright planetary nebulae.  It is similiar in appearance to the Ring Nebula (Messier 57,) whose size, age and physical characteristics are similiar to the Dumbell Nebula (Messier27) varying only in it's appearance due to it's relative proximity from the equatorial viewing angle.

 

ABOUT THE IMAGE

DATE/TIME:  The evening and early mornings of August 24th, 26th and 27th, 2011.

CAMERA:  Canon XSI, 450D modified

TELESCOPE:  Orion 100ED @ F/9

MOUNT:  Celestron CG-5GT.

ISO SETTING:  800

EXPOSURES:  38

EXPOSURE LENGTH:  600sec.

TOTAL EXPOSURE LENGTH:  6hrs 20min.

SUBTRACTIONS: 30 dark frames, 10 bias frames and 20 flat frames.

CAPTURE: MaximDL

STACKING/PRE-PROCESSING: Deep Sky Stacker

PROCESSING: Photoshop CS3

 

 

 

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