Galaxy
NGC 2903 (NGC2903)
In Leo (Leo) • Magnitude 8.9 • 12 arcminutes
Open the free AstroPlanner with NGC 2903 pre-selected, scored against your telescope, location, and the live cloud forecast.
Barred spiral galaxy in Leo.
NGC 2903 at a glance
| Catalog IDs | N 2903 |
| Type | Galaxy |
| Constellation | Leo (Leo) |
| Right ascension | 09h 32m 10s |
| Declination | +21° 30' 03" |
| Apparent magnitude | 8.90 |
| Surface brightness | 23.0 mag/arcsec² |
| Angular size | 11.9 × 5.3 arcmin |
| Max altitude at 45°N | 67° |
| Best imaging months | Feb, Mar, Apr, May |
How to image NGC 2903
NGC 2903 sits in the constellation Leo at right ascension 09h 32m 10s and declination +21° 30' 03". 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 2903 needs the darkest skies you can find: surface brightness, not just apparent magnitude, drives whether it will lift out of the gradient.