NGC 2244
NGC 2244 | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Monoceros |
Right ascension | 6h 31m 54s[1] |
Declination | +4° 56′[1] |
Distance | 5.2 kly |
Apparent magnitude (V) | 4.8[1] |
Apparent dimensions (V) | 24′ |
Physical characteristics | |
Radius | 18 ly[2] |
Other designations | Caldwell 50, Satellite Cluster,[3] NGC 2239,[4] Cr 99 |
NGC 2244 (also known as Caldwell 50 or the Satellite Cluster) is an open cluster in the Rosette Nebula, which is located in the constellation Monoceros. This cluster has several O-type stars, super hot stars that generate large amounts of radiation and stellar wind.
The age of this cluster has been estimated to be less than 5 million years. The brightest star in the cluster is , a foreground K-class giant. The two brightest members of the cluster are of spectral class O4V, 400,000 times brighter than the Sun, and approximately 50 times more massive, and , whose spectral type is O5V, has a luminosity 450,000 time larger than that of our star, and is up to 60 times more massive, but it may actually be a double star.[5]
References[]
- ^ a b c "NGC 2244". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-04-20.
- ^ distance × sin( angular diameter / 2 )
- ^ "The Rosette Nebula In Hubble Palette". Sky & Telescope. Retrieved 2020-06-23.
- ^ "Notes on the NGC objects, particularly those missing, misidentified, or otherwise unusual (ngcnotes.all)". Historically-aware NGC/IC Positions and Notes. Retrieved 2019-08-11.
- ^ A quantitative study of O stars in NGC 2244 and the Monoceros OB2 association, Martins, F.; Mahy, L.; Hillier, D. J.; Rauw, G., Astronomy and Astrophysics 538, pp. A39, Bibcode:2012A&A...538A..39M, doi:10.1051/0004-6361/201117458.
External links[]
- Media related to NGC 2244 at Wikimedia Commons
- NASA – photo and information on NGC 2244
- Spitzer Space Telescope site – Photo of NGC 2244
- NGC 2244 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Categories:
- Open clusters
- Monoceros (constellation)
- NGC objects
- Caldwell objects