Thor's Helmet (NGC 2359)

Here is Thor's helmet (NGC 2359), an emission nebula in Canis Major, discovered by William Herschel in 1785. The star in the center of the nebula is a Wolf-Rayet star WR7 (HD 56925), that contributes to the filamentous aspect of the nebula as it interacts with a nearby molecular cloud. The oxygen atoms present in the gas cloud are the source of the blue emissions.
Techkies: Telescope: Esprit 100DE, Camera: ToupTek 26mp Sony Imx571 1.8" Aps-c CMOS Sensor, Mount: SkyWatcher eq6-R pro, Astronomik filters: LRGB and HSO 6nm filters. Integration: Approximately 20 photos each of red, green, and blue filters at 60 seconds each, and approximately 55 HSO narrowband filter at 300 seconds each. Total integration time of approximately 6 hours (plus calibration frames).