M109 in Ursa Major


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Description: M109 is a barred spiral that is around 55 million light years distant.
Exposure Data: 5/1,2/2003.  LRGB: 15x10m, 6x10m, 6x10m, 6x10m, RGB 2x2. -20C, 0.49 arc-sec./pixel.
Processing: Acquired via Sequencer and Maxim, reduced and aligned, gradient correction in Mira, combined with Sigma Reject plug-in, L: 20xRL in AIP4WIN, RGB combined 1.27:1.00:1.69 in Maxim, LRGB assembly, curves, levels, USM other processing in Photoshop.
Optical System: 12.5 Ritchey-Chretien RCOS Truss @ F/9, ST-10XME NABG/CFW-8A CCD camera, L: AO-7 guided, RGB: autoguided with Paramount ME mount.
Comments: Seeing was around 2.5 arc-sec.  The image deconvolved to 1.6 arc-sec.  Here is a version with a 10" RC truss and ST-10XME and here is a version with a 10" RC truss and ST-8E.