NGC 6633
| NGC 6633 | |
|---|---|
| Observation data (J2000.0 epoch) | |
| Right ascension | 18h 27.7m |
| Declination | 6° 34′ |
| Distance | 1.04 kly |
| Apparent magnitude (V) | 4.6 |
| Apparent dimensions (V) | 27′ |
| Physical characteristics | |
| Estimated age | 660 million years |
| Other designations |
NGC 6633, De Cheseaux No. 3 H VIII.72, Melotte 201, Collinder 380 |
NGC 6633 is an open cluster, in the constellation Ophiuchus, that was, according to the Webb Society Deep-Sky Observer's Handbook, Volume 3 (Open and Globular Star Clusters), p. 3, discovered in 1745-46 by Philippe Loys de Chéseaux. It was independently rediscovered by Caroline Herschel, and been included in her brother's catalog as H VIII.72.
This cluster is nearly as large as the full moon, and contains 30 stars which make it shine at a total magnitude of 4.6; the brightest star is of mag 7.6. Its age was estimated at 660 million years.
External links
- http://messier.seds.org/xtra/ngc/n6633.html
- NGC 6633 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
