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Michael A. Stecker
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Head Nebula with Askar103APO
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 M101 galaxy (version 1) M101, the Pinwheel Galaxy, is a large face-on spiral galaxy located 21 million light-years from Earth in the constellation Ursa Major. M101 with a diameter of 252,000 light-years is larger than our MKilky Way (diameter of 87,400 light-years) and has around one trillion stars compared to about 300 billion for the Milky Way. This LRGB-Ha cropped photo is ajoint project of James Foster and Michael Stecker using my Celestron 11-inch Schmidt Cassegrain telescope at f/7.5. Exposures were: L= 224min,, H-alpha= 205min RGB= 223min. with a total exposure time of 712-min or 11.86-hours. Stacked subs were 160-seconds each, except 300-sec for Hydrogen-alpha. file: M101-LRGB&Ha4b-orig-crsm.jpg Click here for full resolution image Photographic Data Date: March, 2026 Telescope: Celestron C11 11-inch SCT at f/7.5 aperture: 2,794 mm, focal ratio with Starizona reducer: f/7.5. reduced focal length: 2,095 mm Mount: iOptron CEM60 with off-axis guiding Imaging Camera: ZWO ASI6200MC-Pro full frame monochrome astrocamera Exposures: LRGB-Ha cropped photo. Exposures were: L=224min,Ha=205min,Color=283min, total Exp=712 min or 11.86hrs. All subs were 160-seconds, except 300-seconds for Hydrogen-alpha. .photographic site: James Foster observatory at Pinon Pines Estates (Frazier Park) California (Bortle 4 at 5,500 ft elevstion)  M101 galaxy (version 2) file: M101-LRGB&Ha4b-orig-cryc2crsm.jpg Click here for full resolution image |
