The Pinwheel

It is my best rendition of this beautiful galaxy to date I think. It’s commonly, but unofficially called the Pinwheel Galaxy and is cataloged in the Messier catalog as M101. It is about 21 million light years away and is in Ursa Major near the end of the handle of the Big Dipper. It can be a difficult target because it has a low surface brightness, and the outer arms and “wispy bits” can be hard to capture and bring out.

This is my first image from a new remote setup that I am sharing with a couple of friends. One is hosting the location, and another and I have contributed bits of the gear we are using. It’s really quite nice to log in remotely to a location across the country that is under a dark sky and use a system ready to go! This image is 10 total hours of exposure time through colored filters and some “Luminance” (black and white) to boot. This is also the first time I’ve produced a deep sky image with a CMOS camera that I felt was on a par with CCD camera technologies. I’ve long maintained that people saying “CMOS is catching up to CCD” should note the important word “catching”, …as in not there yet. I think we are there finally, and we can stop saying that now. Of course, good cameras are still at a premium, and the one we are using is a ZWO 6200 Pro (monochrome). We are shooting binned 2×2 on an Esprit 150 in order to not be too over sampled. The full resolution version of this image is quite satisfactory to me (this is also cropped down a bit from the full frame image).

The Pinwheel Galaxy in Ursa Major