Open cluster
NGC 2451 (NGC2451)
In Puppis (Pup) • Magnitude 9.5 • 38 arcminutes
Open the free AstroPlanner with NGC 2451 pre-selected, scored against your telescope, location, and the live cloud forecast.
Bright open cluster in Puppis.
NGC 2451 at a glance
| Catalog IDs | N 2451 |
| Type | Open cluster |
| Constellation | Puppis (Pup) |
| Right ascension | 07h 45m 15s |
| Declination | -37° 58' 03" |
| Apparent magnitude | 9.50 |
| Angular size | 37.5 × 37.5 arcmin |
| Max altitude at 45°N | 7° |
| Best imaging months | Dec, Jan, Feb |
How to image NGC 2451
NGC 2451 sits in the constellation Puppis at right ascension 07h 45m 15s and declination -37° 58' 03". 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.