NGC2403 is an intermediate SAB(s)cd spiral 9.65 million light-years from Earth in constellation Camelopardalis and its is an outlying member of the M61 Group. NGC2403’s apparent magnitude is 8.9 and was discovered by William Hershel in November 1788. Edwin Hubble detected Cepheid variables in NGC2403 using the Hale Telescope, making it the first galaxy beyond the Local Group within which a Cepheid was discovered

NGC2403 bears a similarity to M33, containing numerous star-forming H II regions, but being a little bit larger at approximately 90,000 light-years in diameter compared to the 61,100 light-year diameter of M33. It is a flocculent spiral galaxy, with short, patchy arms.

The list below exhibits the number of subframes used with the exposure time for each filter. All the subframes were calibrated with Flats, Darks and Biases by PixInsight. Afterwards the subframes were combined and processed to the final image.

^* 2×2 binned

Total time for collecting data for this image is 12 hours.