Globular cluster
47 Tucanae (NGC104)
In Tucana (Tuc) • Magnitude 4.1 • 32 arcminutes
Open the free AstroPlanner with 47 Tucanae pre-selected, scored against your telescope, location, and the live cloud forecast.
Second-brightest globular cluster, in Tucana.
47 Tucanae at a glance
| Catalog IDs | N 104 |
| Type | Globular cluster |
| Constellation | Tucana (Tuc) |
| Right ascension | 00h 24m 05s |
| Declination | -72° 04' 53" |
| Apparent magnitude | 4.10 |
| Surface brightness | 20.2 mag/arcsec² |
| Angular size | 31.8 × 31.8 arcmin |
| Max altitude at 45°N | Below horizon |
| Best imaging months | Sep, Oct, Nov, Dec |
How to image 47 Tucanae
47 Tucanae sits in the constellation Tucana at right ascension 00h 24m 05s and declination -72° 04' 53". 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.