Xi1 Capricorni
Star in the constellation Capricornus
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Xi1 Capricorni, Latinized from ξ1 Capricorni, is an orange-hued star in the constellation Capricornus. Its name is a Bayer designation that is Latinized from ξ1 Capricorni, and abbreviated Xi1 Cap or ξ1 Cap. With an apparent visual magnitude of +6.34,[3] it is near the lower limit of brightness for stars that can be seen with the naked eye. Based upon an annual parallax shift of 5.32 mas as seen from Earth,[2] this system is located approximately 614 light-years (188 pc) 620 light-years distant from the Sun.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus[1] |
| Right ascension | 20h 11m 57.898s[2] |
| Declination | −12° 23′ 32.65″[2] |
| Apparent magnitude (V) | +6.34[3] |
| Characteristics | |
| Spectral type | K0 III[4] |
| B−V color index | +1.21[3] |
| Variable type | Constant[1] |
| Astrometry | |
| Radial velocity (Rv) | +0.9[5] km/s |
| Proper motion (μ) | RA: −8.251 mas/yr[2] Dec.: −18.278 mas/yr[2] |
| Parallax (π) | 5.3163±0.0275 mas[2] |
| Distance | 614 ± 3 ly (188.1 ± 1.0 pc) |
| Absolute magnitude (MV) | +0.56[1] |
| Details | |
| Mass | 1.55[6] M☉ |
| Radius | 18.88+0.72 −0.95[7] R☉ |
| Luminosity | 139±2[7] L☉ |
| Surface gravity (log g) | 1.48±0.10[8] cgs |
| Temperature | 4,439±42[6] K |
| Metallicity [Fe/H] | −0.18±0.11[8] dex |
| Age | 3.35[6] Gyr |
| Other designations | |
| ξ1 Cap, 1 Cap, BD−12°5664, GC 28026, HD 191753, HIP 99529, HR 7712, SAO 163328[9] | |
| Database references | |
| SIMBAD | data |
It is an evolved K-type giant star with a stellar classification of K0 III.[4] With an age of 3.35 billion years, this star has an estimated 1.55[6] times the mass of the Sun and is radiating 139[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,439 K.[6]