46 Capricorni
Star in the constellation Capricornus
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46 Capricorni is a solitary[7] star located around 780 light years away from the Sun in the southern constellation of Capricornus, near the northern border with Aquarius. It is visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of +5.10.[2] 46 Cap is also known by its Bayer designation of c Capricorni (c Cap), and occasionally as c1 Capricorni to distinguish it from the nearby star c2 Capricorni.[8] It is moving closer to the Earth with a heliocentric radial velocity of −15.5 km/s.[3]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 45m 00.25467s[1] |
| Declination | −09° 04′ 56.7396″[1] |
| Apparent magnitude (V) | 5.10[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[1] |
| Spectral type | G8Iab[3] or G7.5II-IIICN0.5[4] |
| B−V color index | 1.108±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | −15.52±0.15[3] km/s |
| Proper motion (μ) | RA: +13.438[1] mas/yr Dec.: −1.900[1] mas/yr |
| Parallax (π) | 4.1906±0.0858 mas[1] |
| Distance | 780 ± 20 ly (239 ± 5 pc) |
| Absolute magnitude (MV) | −1.81[2] |
| Details | |
| Mass | 4.64±0.53[5] M☉ |
| Radius | 32.6±2.3[3] R☉ |
| Luminosity (bolometric) | 627[5] L☉ |
| Surface gravity (log g) | 2.00[3] cgs |
| Temperature | 4,837±18[3] K |
| Metallicity [Fe/H] | +0.01[3] dex |
| Other designations | |
| c1 Cap, 46 Cap, BD−09°5829, GC 30448, HD 206834, HIP 107382, HR 8311, SAO 145637, PPM 205561, GSC 05788-01167[6] | |
| Database references | |
| SIMBAD | data |
This star has received a stellar classification of G8Iab,[3] which suggests it is a G-type supergiant star, as well as G7.5II-IIICN0.5,[4] which instead indicates a luminosity class between a giant and a bright giant. Abundance analysis suggests the star has not yet passed the first dredge-up.[3] It has 4.6[5] times the mass of the Sun and has expanded to 33[3] times the Sun's radius. The star is radiating 627[5] times the luminosity of the Sun from its photosphere at an effective temperature of 4,837 K.[3]