M81 - SPIRAL GALAXY IN URSA MAJOR (Grayscale) - Cetin BAL - GSM: +90 05366063183

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M81 Galaxy

URSA MAJOR - SPIRAL GALAXY - MAGNITUDE 7.9

M81 - SPIRAL GALAXY IN URSA MAJOR (Grayscale)

About this Object:

M81 is a nice spiral galaxy in Ursa Major, the "big bear." Its size, as it appears from earth, is near the equivalent of our full moon; therefore, this is one of the larger galaxies in the night sky from our vantage point. Here, the majestic and sweeping spiral arms show an abundance of hot, star forming regions. Often seen in images with its famous pair 81, this galaxy is circumpolar for most of the United States meaning that M81 (and M82) rests very near the celestial pole, at least near enough that it never sinks below the horizon. M81 is also known as "Bode's Nebula."
For an image of M81 with M82, click <here>.

Location: Ballauer Observatory near Azle, Texas
Seeing: 5/10
Transparency: 4/10
Temperature: 50 degrees F, -25c at the camera
Date: March 7, 2005
Scope/Mount: 12.5" RCOS Ritchey-Chretien and Paramount ME mount
Camera: SBIG STL-6303e astro CCD camera
Exposure Info: Grayscale image; 240 minutes (5 minute subexposures unbinned)
Processing Information: Dark and flat frame calibration, registration, and DDP in MaxIm DL 4. Lucy-Richardson Deconvolution (2 iterations) in CCDSharp. Cropping, levels/curves, sharpening, and noise removal (despeckle) in Photoshop CS.

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