Open cluster
NGC 6633 (NGC6633)
In Ophiuchus (Oph) • Magnitude 4.6 • 12 arcminutes
Open the free AstroPlanner with NGC 6633 pre-selected, scored against your telescope, location, and the live cloud forecast.
Open cluster in Ophiuchus.
NGC 6633 at a glance
| Catalog IDs | N 6633 |
| Type | Open cluster |
| Constellation | Ophiuchus (Oph) |
| Right ascension | 18h 27m 15s |
| Declination | +06° 30' 30" |
| Apparent magnitude | 4.60 |
| Angular size | 12.0 × 12.0 arcmin |
| Max altitude at 45°N | 52° |
| Best imaging months | Jun, Jul, Aug |
How to image NGC 6633
NGC 6633 sits in the constellation Ophiuchus at right ascension 18h 27m 15s and declination +06° 30' 30". 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.