| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h45m 00.25455s[1] |
| Declination | −09° 04′ 56.7478″[1] |
| Apparent magnitude (V) | 5.10[2] |
| Characteristics | |
| 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: +12.80[5] mas/yr Dec.: −1.31[5] mas/yr |
| Parallax (π) | 4.1489 ± 0.1673 mas[1] |
| Distance | 790 ± 30 ly (241 ± 10 pc) |
| Absolute magnitude (MV) | −1.81[2] |
| Details | |
| Mass | 4.64±0.53[6] M☉ |
| Radius | 32.6±2.3[3] R☉ |
| Luminosity (bolometric) | 627[6] 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[7] | |
| Database references | |
| SIMBAD | data |
46 Capricorni is a solitary[8] star located around 790 light years away from the Sun in the southern constellationofCapricornus, 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 designationofc Capricorni (c Cap), and occasionally as c1 Capricorni to distinguish it from the nearby star c2 Capricorni.[9] It is moving closer to the Earth with a heliocentric radial velocity of −15.5 km/s.[3]
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[6] times the mass of the Sun and has expanded to 33[3] times the Sun's radius. The star is radiating 627[6] times the luminosity of the Sun from its photosphere at an effective temperature of 4,837 K.[3]
This star, along with β Aqr (Sadalsuud) and ξ Aqr (Bunda), were Saʽd al Suʽud (سعد السعود), the Luck of Lucks.[10][11]
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