NGC 339
| NGC 339 | |
|---|---|
 NGC 339 imaged by theHubble Space Telescope | |
| Observation data (J2000.0epoch) | |
| Class | ~VIII |
| Constellation | Tucana |
| Right ascension | 00h57m45.0s |
| Declination | −74° 28′ 20″[1] |
| Distance | 186 ± 4 kly (57 ± 1 kpc[2]) |
| Apparent magnitude(V) | 12.12[3] |
| Apparent dimensions(V) | 2.2 arcminutes[1] |
| Physical characteristics | |
| Mass | 5.7×104[3]M☉ |
| Radius | 119 ± 3 ly (36.5 ± 0.7 pc[4]) |
| Estimated age | 6.30±0.50Gyr[3] |
| Other designations | ESO 029-SC 02[2] |
NGC 339is aglobular clusterin the constellationTucanatheToucan.It is located both visually and physically in theSmall Magellanic Cloud,being only about 10,000 ± 12,000 light years (3,000 ± 3,000 parsecs) closer than the cloud. It is rather prominent, being the brightest cluster in the southern reaches of the cloud. It was discovered byJohn Herschelon September 18, 1835.[1]It was observed in 2005 by theHubble Space Telescope.Its apparent V-band magnitude is 12.12, but at this wavelength, it has 0.19 magnitudes ofinterstellar extinction.[3]
NGC 339 is about 6.3 billion years old. Its estimated mass is5.7×104M☉,and its total luminosity is7.2×104L☉,leading to a mass-to-luminosity ratio of 0.79M☉/L☉.[3]All else equal, older star clusters have higher mass-to-luminosity ratios; that is, they have lower luminosities for the same mass.[3]
References
[edit]- ^abcSeligman, Courtney."NGC 0339".cseligman.Retrieved9 May2015.
- ^ab"NED search results for NGC 339".NASA/IPAC Extragalactic Database.NASA.Retrieved9 May2015.
- ^abcdefSong, Ying-Yi; Mateo, Mario; Bailey, John I.; Walker, Matthew G.; Roederer, Ian U.; Olszewski, Edward W.; Reiter, Megan; Kremin, Anthony (2021)."Dynamical masses and mass-to-light ratios of resolved massive star clusters – II. Results for 26 star clusters in the Magellanic Clouds".Monthly Notices of the Royal Astronomical Society.504(3): 4160–4191.arXiv:2104.06882.doi:10.1093/mnras/stab1065.
- ^"Angular Size calculator".1728.org.Retrieved9 May2015.
External links
[edit]
Media related toNGC 339at Wikimedia Commons
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