M 109 (also known as NGC 3992) is a spiral galaxy barred about 55
million light years, in the constellation Ursa Major.
It has an angular extension of about 7-8 arc minutes, an apparent
magnitude of 9.5 and a real diameter of about 130,000 light years.
Image obtained from my home terrace in conditions of strong light
Technical data Optic Celestron C9.25 Edge HD f/10 Mount Losmandy G11 with Ovision worm and FS2 Camera Atik 4000 with Starlight Xpress filter wheel 5 positions Filters Hutech Idas LPS-P2 50.8 unmounted Guiding system OAG LB Astro Proxima with Lodestar Exposure details L 52x600" bin1 -20C Total integration 8,7h Acquisition Maxim, PHD2 Processing Maxim, Photoshop CS5 SQM-L 18.2 Location Home terrace (Rescaldina, Italy) Date 5 February 2016, 10 March 2016