Kappa Arae
Template:Location mark The location of κ Arae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.200±0.009[2] |
| Characteristics | |
| Evolutionary stage | Giant[3] |
| Spectral type | G8 III[4] |
| B−V Template:Engvar | +1.03±0.01[2] |
| Astrometry | |
| Radial velocity (Rv) | +17.8±0.1[5] km/s |
| Proper motion (μ) | RA: +13.004 mas/yr[1] Dec.: +7.554 mas/yr[1] |
| Parallax (π) | 7.5862±0.0741 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.49±0.06[2] |
| Details[2] | |
| Mass | 3.23±0.24 Template:Solar mass |
| Radius | 18.22±0.60 Template:Solar radius |
| Luminosity | 166.1±8.9 Template:Solar luminosity |
| Surface gravity (log g) | 2.56±0.15 cgs |
| Temperature | 4,855±48 K |
| Metallicity [Fe/H] | −0.058±0.037 dex |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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Kappa Arae is a single[8] star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from κ Arae, and abbreviated Kappa Ara or κ Ara. With an apparent visual magnitude of 5.20,[2] this star is faintly visible to the naked eye. Based upon parallax measurements, it is approximately Script error: No such module "convert". distant from Earth, give or take a 4 light-year margin of error.[1] It is receding from the Sun with a radial velocity of +17.8 km/s.[5]
This is a giant star with a stellar classification of G8 III,[4] having exhausted the hydrogen at its core and evolved away from the main sequence. With 3.2 times the mass of the Sun, its outer envelope has expanded to about 18 times the Sun's radius. It is radiating 166 times the luminosity of the Sun from its photosphere at an effective temperature of 4,855 K.[2] This is hot enough for it to shine with the golden-hued glow of a G-type star.[9] It is a source for coronal X-ray emission and has been reported as a mild barium star, although the latter is questionable.[10]
Kappa Arae has two 14th magnitude optical companions that are at an angular distance of 25 and 30 arcseconds.[11]
References
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