Galaxy
NGC 891 (NGC891)
In Andromeda (And) • Magnitude 10.0 • 14 arcminutes
Open the free AstroPlanner with NGC 891 pre-selected, scored against your telescope, location, and the live cloud forecast.
A spectacular edge-on spiral in Andromeda with a prominent dust lane.
NGC 891 at a glance
| Catalog IDs | N 891, C 23 |
| Type | Galaxy |
| Constellation | Andromeda (And) |
| Right ascension | 02h 22m 37s |
| Declination | +42° 21' 00" |
| Apparent magnitude | 10.00 |
| Surface brightness | 14.2 mag/arcsec² |
| Angular size | 13.5 × 2.8 arcmin |
| Max altitude at 45°N | 87° |
| Best imaging months | Oct, Nov, Dec, Jan |
How to image NGC 891
NGC 891 sits in the constellation Andromeda at right ascension 02h 22m 37s and declination +42° 21' 00". 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 891 needs the darkest skies you can find: surface brightness, not just apparent magnitude, drives whether it will lift out of the gradient.