HD 166066
Star in the constellation Octans
From Wikipedia, the free encyclopedia
HD 166066 is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 8.10,[3] making it readily visible in binoculars, but not to the naked eye. The object is located 223 light years away from the Solar System,[2] but is drifting away with a poorly constrained radial velocity of about 1.14 km/s.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans[1] |
| Right ascension | 18h 38m 51.0741s[2] |
| Declination | −85° 42′ 32.2260″[2] |
| Apparent magnitude (V) | 8.10±0.01[3] |
| Characteristics | |
| Spectral type | G0 V[4] |
| B−V color index | +0.59[3] |
| Astrometry | |
| Radial velocity (Rv) | 1.14±2.01[2] km/s |
| Proper motion (μ) | RA: +147.318 mas/yr[2] Dec.: −43.097 mas/yr[2] |
| Parallax (π) | 14.5962±0.1186 mas[2] |
| Distance | 223 ± 2 ly (68.5 ± 0.6 pc) |
| Absolute magnitude (MV) | 4.09[1] |
| Details | |
| Mass | 1.13[5] M☉ |
| Radius | 1.39+0.07 −0.05[6] R☉ |
| Luminosity | 2.12[1] L☉ |
| Surface gravity (log g) | 4.25[5] cgs |
| Temperature | 6,054±80[5] K |
| Metallicity [Fe/H] | −0.03[5] dex |
| Rotational velocity (v sin i) | 5[7] km/s |
| Age | 7.0+2.5 −1.2[8] Gyr |
| Other designations | |
| CD−85°150, CPD−85°478, HD 166066, HIP 91434, GSC 09527-01174[9] | |
| Database references | |
| SIMBAD | data |
HD 166066 has a stellar classification of G0 V, indicating that it is a G-type main sequence star similar to the Sun.[4] However, the calcium H & K lines are narrow and weak for its class.[4] It has 113% the mass of the Sun[5] and 139% its radius, along with twice its luminosity.[1][6]
The iron abundance is 93% that of the Sun, and is slightly hotter, with an effective temperature of 6,054 K[5] compared to the Sun's 5,778 K. HD 166066 is significantly older, with an age of 7 billion years,[8] and rotates modestly with a projected rotational velocity of 5 km/s.[7]