Astronomy:NGC 416
| NGC 416 | |
|---|---|
 NGC 416 by Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Tucana |
| Right ascension | 01h 07m 58.5s[1] |
| Declination | −72° 21′ 18″[1] |
| Distance | 199,000 ± 9,800 ly (61,000 ± 3,000 pc)[1] |
| Apparent magnitude (V) | 11.42[2] |
| Apparent dimensions (V) | 1.2′ × 1.2′[3] |
| Physical characteristics | |
| Mass | 8.0×104[2] M☉ |
| Estimated age | 6.60±0.80 Gyr[2] |
| Other designations | ESO 029-SC 032.[1] |
NGC 416 is a globular cluster located in the constellation Tucana. It was discovered on September 5, 1826, by James Dunlop. It was described by Dreyer as "faint, pretty small, round, gradually brighter middle".[3] At a distance of about 199,000 ± 9,800 ly (61,000 ± 3,000 pc), it is located within the Small Magellanic Cloud.[3] At an aperture of 31 arcseconds, its apparent V-band magnitude is 11.42, but at this wavelength, it has 0.25 magnitudes of interstellar extinction.[2]
NGC 416 is about 6.6 billion years old. Its estimated mass is 8.0×104 M☉, and its total luminosity is 1.12×105 L☉, leading to a mass-to-luminosity ratio of 0.72 M☉/L☉.[2] All else equal, older star clusters have higher mass-to-luminosity ratios; that is, they have lower luminosities for the same mass.[2]
References
- ↑ 1.0 1.1 1.2 1.3 "NASA/IPAC Extragalactic Database". Results for NGC 0416. http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+416&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Song, 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. doi:10.1093/mnras/stab1065.
- ↑ 3.0 3.1 3.2 "New General Catalog Objects: NGC 400 - 449". Cseligman. http://cseligman.com/text/atlas/ngc4.htm#416.
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