| NGC 1783 | |
|---|---|
 Hubble Space Telescope image of NGC 1783[1] | |
| Observation data (J2000epoch) | |
| Constellation | Dorado[2] |
| Right ascension | 04h 59m 08.6s[3] |
| Declination | −65° 59′ 15.8″[3] |
| Distance | 160Kly[4] (49kpc[4]) |
| Apparent magnitude(V) | 10.93[5] |
| Apparent dimensions(V) | 5.3′ × 4.7′[3] |
| Physical characteristics | |
| Mass | 9.8×104[5] M☉ |
| Estimated age | 1.70±0.05 Gyr[5] |
| Other designations | ESO 85-SC29 |
| See also:Globular cluster,List of globular clusters | |
NGC 1783 (also known asESO 85-SC29) is aglobular cluster within theDorado constellation and part of theLarge Magellanic Cloud, a satellite dwarf galaxy of theMilky Way. At an aperture of 50 arcseconds, its apparent V-band magnitude is 10.39,[5] making it one of the brightest globular clusters in the LMC as viewed from Earth. It was discovered in 1835 byJohn Herschel. The compiler of theNew General Catalogue,John Louis Emil Dreyer, described this cluster as "considerably bright, large, round, very gradually pretty much brighter middle, mottled but not resolved."[2]
NGC 1783 is about 1.7 billion years old. Its estimated mass is9.8×104 M☉, and its total luminosity is3.77×105 L☉, leading to a mass-to-luminosity ratio of 0.26M☉/L☉.[5] All else equal, older star clusters have higher mass-to-luminosity ratios; that is, they have lower luminosities for the same mass.[5]
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