Caldwell 10
Star cluster in Cassiopeia · 8,600 light-years
🔭 Explore Caldwell 10 in the 3D map →View Caldwell 10 images →| Type | Star cluster |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 1h 46m 16s |
| Declination | +61° 13′ |
| Object distance | 8,600 light-years |
| Apparent magnitude | 7.1 |
| Apparent size | 6′ (arc-minutes) |
| Approx. true diameter | 15 light-years across |
| Also known as | C10 · NGC 663 |
Caldwell 10 is a star cluster (NGC 663) in Cassiopeia — a family of stars bound by gravity. It appears as number 10 in the Caldwell catalogue, Sir Patrick Moore's 1995 list of 109 bright deep-sky objects for amateur astronomers. It spans roughly 6 arc-minutes on the sky. At about magnitude 7.1, it is a rewarding binocular and small-telescope target.
Although it appears about 6′ wide on the sky, its real span is roughly 15 light-years — the difference is a measure of how far away it lies.
Observing Caldwell 10
Caldwell 10 lies in the constellation Cassiopeia and is best placed in the evening sky around October. Its maximum altitude above the horizon depends on your latitude. It sits far enough north to be circumpolar from mid-northern latitudes, and never rises for most of the southern hemisphere. It is a comfortable target for binoculars and small telescopes.
See Caldwell 10 in Universe Finder
Open the interactive 3D map to fly to Caldwell 10 and see it in context among the real stars around it. Launch the 3D view →
Sources
- Position, magnitude and angular size from the OpenNGC catalogue (Mattia Verga).
- Object identity cross-referenced with SIMBAD (CDS, Strasbourg).
- Image credits and the original observation source are linked with each photograph.
Related objects
- Pleiades — star cluster
- Hercules Cluster — star cluster
- Small Sgr Star Cloud — star cluster
- Messier 25 — star cluster
- Messier 103 — star cluster