Kappa Capricorni
Star in the constellation Capricornus
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Kappa Capricorni is a solitary[10] star in the constellation Capricornus. Its name is a Bayer designation that is Latinized from κ Capricorni, and abbreviated Kappa Cap or κ Capricorni. This star is visible to the naked eye with an apparent visual magnitude of +4.73.[2] Based upon an annual parallax shift of 11.09 mas as seen from the Earth,[1] the star is located about 305 light-years (93 pc) from the Sun. It is drifting closer with a line of sight velocity of −3 km/s.[5] The star is positioned sufficiently close to the ecliptic that it is occasionally subject to lunar occultation.[11]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 42m 39.508s[1] |
| Declination | −18° 51′ 58.76″[1] |
| Apparent magnitude (V) | +4.73[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | G8 III[4] |
| U−B color index | +0.51[2] |
| B−V color index | +0.88[2] |
| Astrometry | |
| Radial velocity (Rv) | −2.87±0.18[5] km/s |
| Proper motion (μ) | RA: +146.354 mas/yr[1] Dec.: −8.343 mas/yr[1] |
| Parallax (π) | 10.6991±0.1277 mas[1] |
| Distance | 305 ± 4 ly (93 ± 1 pc) |
| Absolute magnitude (MV) | −0.023[6] |
| Details[7] | |
| Mass | 2.43±0.21 M☉ |
| Radius | 13.28±0.47 R☉ |
| Luminosity | 106.8±5.9 L☉ |
| Surface gravity (log g) | 2.59±0.06 cgs |
| Temperature | 5,096±57 K |
| Metallicity [Fe/H] | −0.39±0.10 dex |
| Rotational velocity (v sin i) | 0.0[5] km/s |
| Age | 1.19[8] Gyr |
| Other designations | |
| κ Cap, 43 Cap, BD−19°6152, HD 206453, HIP 107188, HR 8288, SAO 164593[9] | |
| Database references | |
| SIMBAD | data |
This is a yellow-hued, evolved, G-type giant star with a stellar classification of G8 III.[4] There is a 91% probability that it is currently on the horizontal branch, rather than the red giant branch.[7] As such, it is a red clump[3] giant with an estimated 2.43 times the mass of the Sun and has expanded to 13.28 times the radius of the Sun.[7] The star is about 1.2[8] billion years old and has a projected rotational velocity that is too small to be measured.[5] It radiates 107 times the solar luminosity from its photosphere at an effective temperature of 5,096 K.[7]