M81 and M82 Wide Field in Ursa Major


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Description: M81 is the larger spiral galaxy on the right and M82, also known at the "exploding Galaxy" is on the right.  The spiral galaxy at the lower right is NGC3077 and just below M81, is a faintly visible irregular galaxy called Holmberg IX.  Your monitor may have to be adjusted to show this object.
Exposure Data: 4/24/2003.  LRGB: 20x2m, 6x2m, 6x2m, 6x2m. RGB binned 2x2. -10C, 2.65 arc-sec./pixel
Processing: Acquired via Sequencer and CCDSoft, reduced and aligned, gradient correction in Mira, combined with Sigma Reject plug-in,  RGB combined 1.32:1.0:1.57 in Maxim, LLRGB assembly, curves, levels, mild USM other processing in Photoshop.
Optical System: FSQ-106 @ F/5, ST-10XME NABG/CFW-8A CCD camera, unguided with Paramount ME mount.
Comments: Increased sensitivity of the ST-10XME allowed short exposures, but still well above the readout noise limit.  This was one of my targets early in CCD imaging.  Here is the older version.