Galaxy
M110 (M110)
In Andromeda (And) • Magnitude 8.9 • 17 arcminutes
Open the free AstroPlanner with M110 pre-selected, scored against your telescope, location, and the live cloud forecast.
The largest and brightest satellite galaxy of Andromeda, orbiting our nearest large spiral neighbour. Unusually for a dwarf elliptical galaxy, M110 shows signs of recent star formation — possibly triggered by Andromeda's gravity squeezing its gas clouds and forcing stars to be born.
M110 at a glance
| Catalog IDs | M110, N 205 |
| Type | Galaxy |
| Constellation | Andromeda (And) |
| Right ascension | 00h 40m 23s |
| Declination | +41° 41' 24" |
| Apparent magnitude | 8.92 |
| Surface brightness | 13.9 mag/arcsec² |
| Angular size | 17.0 × 10.0 arcmin |
| Max altitude at 45°N | 87° |
| Best imaging months | Jun, Jul, Aug |
How to image M110
M110 sits in the constellation Andromeda at right ascension 00h 40m 23s and declination +41° 41' 24". 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, M110 needs the darkest skies you can find: surface brightness, not just apparent magnitude, drives whether it will lift out of the gradient.