| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h26m 00.04169s[1] |
| Declination | –50° 38′ 00.6417″[1] |
| Apparent magnitude (V) | 5.21[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| B−V color index | +1.05[2] |
| Astrometry | |
| Radial velocity (Rv) | +17.3[4] km/s |
| Proper motion (μ) | RA: +13.45[1] mas/yr Dec.: +8.36[1] mas/yr |
| Parallax (π) | 7.16 ± 0.40 mas[1] |
| Distance | 460 ± 30 ly (140 ± 8 pc) |
| Absolute magnitude (MV) | –0.58[5] |
| Details | |
| Radius | 14[6] R☉ |
| Surface gravity (log g) | 2.3[5] cgs |
| Temperature | 4,950[5] K |
| Metallicity [Fe/H] | –0.3[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Arae (κ Ara, κ Arae) is the Bayer designation for a single[8] star in the southern constellationofAra. Based upon parallax measurements, it is approximately 460 light-years (140 parsecs) distant from Earth, give or take a 30 light-year margin of error.[1] With an apparent visual magnitude of 5.21,[2] this star is faintly visible to the naked eye.
This is a giant star with a stellar classification of G8 III;[3] its outer envelope has expanded to about 14 times the radius of the Sun.[6] It is radiating energy into space at an effective temperature of 4,950 K.[5] This is hot enough for it to shine with the golden-hued glow of a G-type star.[9]
It has two 14th magnitude optical companions that are at an angular distance of 25 and 30 arcseconds.[citation needed]
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