HD 222060
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 23h 38m 23.88625s[1] |
| Declination | −76° 52′ 10.3567″[1] |
| Apparent magnitude (V) | 5.98±0.01[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[3] |
| Spectral type | K0 II/III[4] |
| U−B color index | +0.65[5] |
| B−V color index | +0.90[5] |
| Astrometry | |
| Radial velocity (Rv) | 2.3±0.5[6] km/s |
| Proper motion (μ) | RA: +83.519 mas/yr[1] Dec.: −25.064 mas/yr[1] |
| Parallax (π) | 6.0864±0.0294 mas[1] |
| Distance | 536 ± 3 ly (164.3 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.05[7] |
| Details[8] | |
| Mass | 3.20±0.10 M☉ |
| Radius | 12.6±0.2 R☉ |
| Luminosity | 102±3 L☉ |
| Surface gravity (log g) | 2.85±0.06 cgs |
| Temperature | 5,175±30 K |
| Metallicity [Fe/H] | +0.05±0.03 dex |
| Rotational velocity (v sin i) | 3.7±1[9] km/s |
| Age | 318+30 −40[1] Myr |
| Other designations | |
| 84 G. Octantis[10], CPD−77°1583, GC 32840, HD 222060, HIP 116653, HR 8957, SAO 258166[11] | |
| Database references | |
| SIMBAD | data |
HD 222060, also known as HR 8957, is a solitary, orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.98,[2] allowing it to be faintly visible to the naked eye. Based on parallax measurements from GAIA, the object is estimated to be 536 light years distant.[1] It appears to be slowly receding from the Solar System, having a heliocentric radial velocity of 2.3 km/s.[9]
This is an evolved giant star that is currently on the red giant branch,[3] fusing a hydrogen shell around a helium core. HD 222060 a stellar classification of K0 II/III,[4] a K-type star with the blended luminosity class of a giant and a bright giant. It has 3.2 times the mass of the Sun[8] and is currently 318 million years old.[9] Due to its high mass, the object has expanded to an enlarged radius of 12.6 R☉.[8] It radiates 102 times the luminosity of the Sun from its photosphere at an effective temperature of 5,175 K.[8] HD 222060 has a near solar metallicity[8] and spins modestly with a projected rotational velocity of 3.7 km/s.[9]
