Emission nebula
Rosette Nebula (NGC2237)
In Monoceros (Mon) • Magnitude 9.0 • 1.3 degrees
Open the free AstroPlanner with Rosette Nebula pre-selected, scored against your telescope, location, and the live cloud forecast.
Iconic winter emission nebula in Monoceros surrounding open cluster NGC 2244.
Rosette Nebula at a glance
| Catalog IDs | N 2237 |
| Type | Emission nebula |
| Constellation | Monoceros (Mon) |
| Right ascension | 06h 31m 48s |
| Declination | +04° 58' 12" |
| Apparent magnitude | 9.00 |
| Surface brightness | 14.5 mag/arcsec² |
| Angular size | 80.0 × 60.0 arcmin |
| Max altitude at 45°N | 50° |
| Best imaging months | Nov, Dec, Jan, Feb |
How to image Rosette Nebula
Rosette Nebula sits in the constellation Monoceros at right ascension 06h 31m 48s and declination +04° 58' 12". 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 an emission nebula, Rosette Nebula responds very well to dual-narrowband filters under city skies.