the ring nebula

 

M57, also designated NGC 6720, or most commonly called the "Ring Nebula," is one of the most prominent examples of deep sky objects called planetary nebula.  M57 lies about 2,300 light-years from Earth in the constellation Lyra, and has a visual magnitude of 8.8.

http://en.wikipedia.org/wiki/Ring_Nebula

 

ABOUT THE IMAGE

 

DATE/TIME:  The evening of June 2nd and morning of the 3rd, 2009.

CAMERA:  Canon XSI, 450D

TELESCOPE:  Orion 100mm ED refractor @ F/18

ISO SETTING:  800

EXPOSURES:  40

EXPOSURE LENGTH:  5min.

TOTAL EXPOSURE LENGTH:  3hrs, 20min.

SUBTRACTIONS:  20 dark frames and 10 bias frames.

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3

 

 

 

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