Galaxy
NGC 2403 (NGC2403)
In Camelopardalis (Cam) • Magnitude 8.4 • 20 arcminutes
Open the free AstroPlanner with NGC 2403 pre-selected, scored against your telescope, location, and the live cloud forecast.
Spiral galaxy in Camelopardalis, similar to M33.
NGC 2403 at a glance
| Catalog IDs | N 2403 |
| Type | Galaxy |
| Constellation | Camelopardalis (Cam) |
| Right ascension | 07h 36m 51s |
| Declination | +65° 36' 09" |
| Apparent magnitude | 8.40 |
| Surface brightness | 23.5 mag/arcsec² |
| Angular size | 19.9 × 10.1 arcmin |
| Max altitude at 45°N | 69° |
| Best imaging months | Dec, Jan, Feb |
How to image NGC 2403
NGC 2403 sits in the constellation Camelopardalis at right ascension 07h 36m 51s and declination +65° 36' 09". To frame and integrate it well, AstroPlanner will compute the optimal moonless window for tonight from your location, the field-of-view fit against your sensor and focal length, the suggested total integration time given your aperture and sky Bortle class, and a cloud-aware schedule that drops it from the plan if your nearest cloud forecast spike overlaps the best altitude window. As a galaxy, NGC 2403 needs the darkest skies you can find: surface brightness, not just apparent magnitude, drives whether it will lift out of the gradient.