Caldwell 47
Star cluster in Delphinus · 52,000 light-years
🔭 Explore Caldwell 47 in the 3D map →View Caldwell 47 images →| Type | Star cluster |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 34m 11s |
| Declination | +7° 24′ |
| Object distance | 52,000 light-years |
| Apparent magnitude | 9.8 |
| Apparent size | 5.4′ (arc-minutes) |
| Approx. true diameter | 81.7 light-years across |
| Also known as | C47 · NGC 6934 |
Caldwell 47 is a star cluster (NGC 6934) in Delphinus — a family of stars bound by gravity. It appears as number 47 in the Caldwell catalogue, Sir Patrick Moore's 1995 list of 109 bright deep-sky objects for amateur astronomers. It spans roughly 5.4 arc-minutes on the sky. At about magnitude 9.8, it shows up in a small backyard telescope.
Although it appears about 5.4′ wide on the sky, its real span is roughly 81.7 light-years — the difference is a measure of how far away it lies.
Observing Caldwell 47
Caldwell 47 lies in the constellation Delphinus and is best placed in the evening sky around July. Its maximum altitude above the horizon depends on your latitude. Lying near the celestial equator, it can be seen from both hemispheres. A small backyard telescope will show it; binoculars may hint at it under dark skies.
See Caldwell 47 in Universe Finder
Open the interactive 3D map to fly to Caldwell 47 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