NGC 2403 (Camelopardalis)

Fig. 1 - Clumpy appearance due to foreground stars and an abundant amount of H II regions within the object itself: The spiral galaxy NGC 2403 in the constellation Camelopardalis, photographed with an 8-inch f/5 Newtonian reflector on a ZWO AM5 mount.

Fig. 1 - Clumpy appearance due to foreground stars and an abundant amount of H II regions within the object itself: The spiral galaxy NGC 2403 in the constellation Camelopardalis, photographed with an 8-inch f/5 Newtonian reflector on a ZWO AM5 mount.


Object name:Constellation:Coordinates:Apparent size:Visual brightness:
NGC 2403Camelopardalis07h37m / +65°36'21.9' x 12.3'8.2 mag


The spiral galaxy NGC 2403 ("Caldwell 7") in the constellation Camelopardalis. It is an outlying member of the M81 Group. The galaxy is approximately 8 million light-years from Earth, 50,000 light-years in diameter and contains numerous star-forming H II regions. NGC 2403 was discovered by British astronomer William Herschel in 1788. (source: Wikipedia).

Eighty-seven 3-minute exposures (261 minutes total exposure) at gain 100 and -10°C, taken on December 28 / 29, 2024, were added for this shot with Astro Pixel Processor (APP) software and the final image processing was done in Photoshop. Darks, flats, bias and darkflats were used.

Equipment: Cooled ASI 2600MC Pro camera, TeleVue Paracorr Type II coma corrector, 8" f/5 "ONTC" Newtonian telescope riding on a ZWO AM5 Strain Wave Mount, ZWO OAG-L off axis system, ASI 174MM Mini guide camera, ASIAIR Plus.

Fig. 2 - Search chart for NGC 2403. Copyright 2025 'The Mag-7 Star Atlas Project', www.siaris.net.

Fig. 2 - Search chart for NGC 2403. Copyright 2025 'The Mag-7 Star Atlas Project', www.siaris.net.