Emission nebula
NGC 604 (NGC604)
In Triangulum (Tri) • Magnitude 99.0 • 1.9 arcminutes
Open the free AstroPlanner with NGC 604 pre-selected, scored against your telescope, location, and the live cloud forecast.
Giant H II region in M33.
NGC 604 at a glance
| Catalog IDs | N 604 |
| Type | Emission nebula |
| Constellation | Triangulum (Tri) |
| Right ascension | 01h 34m 33s |
| Declination | +30° 47' 06" |
| Apparent magnitude | 99.00 |
| Angular size | 1.9 × 1.2 arcmin |
| Max altitude at 45°N | 76° |
| Best imaging months | Oct, Nov, Dec, Jan |
How to image NGC 604
NGC 604 sits in the constellation Triangulum at right ascension 01h 34m 33s and declination +30° 47' 06". 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, NGC 604 responds very well to dual-narrowband filters under city skies.