Galaxy
IC 10 (IC10)
In Cassiopeia (Cas) • Magnitude 10.3 • 6.8 arcminutes
Open the free AstroPlanner with IC 10 pre-selected, scored against your telescope, location, and the live cloud forecast.
Nearby starburst irregular galaxy in Cassiopeia.
IC 10 at a glance
| Catalog IDs | I 10 |
| Type | Galaxy |
| Constellation | Cassiopeia (Cas) |
| Right ascension | 00h 20m 18s |
| Declination | +59° 18' 14" |
| Apparent magnitude | 10.30 |
| Surface brightness | 24.5 mag/arcsec² |
| Angular size | 6.8 × 6.0 arcmin |
| Max altitude at 45°N | 76° |
| Best imaging months | Sep, Oct, Nov, Dec |
How to image IC 10
IC 10 sits in the constellation Cassiopeia at right ascension 00h 20m 18s and declination +59° 18' 14". 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, IC 10 needs the darkest skies you can find: surface brightness, not just apparent magnitude, drives whether it will lift out of the gradient.