The Details
Object
M51 The Whirlpool Galaxy in Canes Venatici
Optics
12.5" RCOS Ritchey-Chretien at f/6.9
Platform
Astro-Physics 1200 GTO
Camera
SBIG ST-10XME
Filters
Tru-Balance LRGB Filter
Date
17, 18 and 19 April 2009
Location
Mount Wilson Observatory, Mount Wilson CA
Exposure
L 42 x 600 sec 1x1 bin, RGB 6 x 600 sec 1x1 bin each
Software
Maxim DL/CCD, CCDStack, Photoshop CS4
Orientation
Field of View: 16'47"' x 13'13" centered on RA 13h29m54s
DEC+47°12’34” (2000.0) . North angle 91.23 °; east 90° CCW from north
Notes

M51 is located about 31 million lights years from earth. This beautiful face-on spiral and its companion, NGC 4199 are gravitationally bound and locked in a deep space dance. Lord Rosse observed this object with his 72 inch speculum reflector from Birr Castle, Ireland in 1845 and was the first to report it having a spiral structure.

The total exposure time for the above image was 10 hours.

 

 

 

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No reproduction of these images are permitted without prior approval of the author.