The Details
Object
M81 in Ursa Major
Optics
12.5" RCOS Ritchey-Chretien at f/6.9
Platform
Astro-Physics 1200 GTO
Camera
SBIG ST-10XME
Filters
Tru-Balance LRGB filter set
Date
10 March 2005
Location
Red Cloud Road, Eastern Riverside County CA
Exposure
L 12 x 300 sec 1x1 bin; RGB 4 x 300 sec, 2x2 bin
Software
Maxim DL/CCD, Registar, Photoshop, Neat Image 4.4 Pro+
Orientation
Field of View: 18’10" x 12’30" centered on RA 09h55m47s
DEC 69°01’20”. North angle 88.15 °; east 90° CW from north
Notes
Discovered by Johann Bode on December 31, 1774. Also known as Bode's Nebula, this galaxy is 12 million light years distant. Its nearby neighbor, M82, also discovered by Johann Bode on the same night, is only 150,000 light years from M81 and has undergone structural deformation because of the gravitational attraction of its larger neighbor.

This image was the result of a collaborative effort between Dave Jurasevich and David Held , sharing data acquisition and processing tasks.

 

 

 

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