NGC 2403 is a prominent spiral galaxy located in the constellation Camelopardalis, approximately 10 million light-years from Earth. As a member of the M81 Group, NGC 2403 shares similarities with the nearby Andromeda Galaxy (M31), including its spiral structure and rich star-forming regions. This galaxy is noted for its numerous H II regions, which are large clouds of ionized hydrogen where new stars are born, making it a vibrant and active site of stellar formation.

One of the most striking features of NGC 2403 is its well-defined spiral arms, which are adorned with clusters of young, hot stars and bright nebulae. These features make NGC 2403 an excellent subject for studying the processes of star formation and the dynamics of spiral galaxies. Additionally, NGC 2403 has been the site of several supernovae, most notably SN 1954J and SN 2004dj, providing valuable data on the life cycles of stars and the chemical enrichment of galaxies. Its relative proximity and brightness allow astronomers to study its properties in great detail, enhancing our understanding of spiral galaxy evolution.

Instrument or lens: SkyWatcher 200/1000 BLACK DIAMOND                                                        Atik 460 EX Mono                                                                                                                                   SkyWatcher NEQ6 Pro Goto Guidance                                                                                              ZWO OPTICAL DIVIDER Reducer / focal corrector                                                                  SkyWatcher Coma Corrector II                                                                                                      Astronomik RGB, Baader Ha 7nm, Astrnomik CLS-CC Access -s                                                  Astrnomik CLS-CCD: 104x300 "-10C bin 1x1Baader Ha 7nm: 140x300" bin 1x1 Astronomik RGB: 48x150 "bin 1x1                                                                                                                                     Integration: 22.3 Hours Darks: ~ 50Flats / PLU: ~ 11Bias / offset: ~ 1001Astrometry.net job                 AD: 7h 36 '52 "DEC center: + 65 ° 36' 10" Pixel scale: 0.468 arcsec / pixel Orientation: 179.532 degrees Field radius: 0.450 Source data: Backyard

Copyright: Rémi Méré