NGC 416

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
NGC 416 by Hubble Space Telescope
Observation data (J2000 epoch)
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]
Associations
Constellation	Tucana
See also: Open cluster, List of open clusters

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]

See also

• List of NGC objects (1–1000)