HD 10800
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 01h 37m 55.5567s |
| Declination | −82° 58′ 29.9867″ |
| Apparent magnitude (V) | 5.87 |
| Characteristics | |
| Spectral type | G1 V |
| U−B color index | +0.10 |
| B−V color index | +0.61 |
| Astrometry | |
| Radial velocity (Rv) | −1.1±0.4 km/s |
| Proper motion (μ) | RA: +122.526 mas/yr Dec.: +120.827 mas/yr |
| Parallax (π) | 37.0128±0.229 mas |
| Distance | 88.1 ± 0.5 ly (27.0 ± 0.2 pc) |
| Absolute magnitude (MV) | +3.69 |
| Orbit | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 19.371 d |
| Eccentricity (e) | 0.103±0.001 |
| Periastron epoch (T) | 2,456,938.6±0.02 JD |
| Argument of periastron (ω) (primary) | 243±0.4° |
| Semi-amplitude (K1) (primary) | 36.45±0.04 km/s |
| Semi-amplitude (K2) (secondary) | 43.32±0.05 km/s |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | 1.7486±0.0005 yr |
| Semi-major axis (a) | 7.823±0.047 mas |
| Eccentricity (e) | 0.191±0.002 |
| Inclination (i) | 47.6±0.5° |
| Periastron epoch (T) | 2,456,903.42±0.94 JD |
| Argument of periastron (ω) (primary) | 151.2±0.3° |
| Semi-amplitude (K1) (primary) | 9.1±0.03 km/s |
| Semi-amplitude (K2) (secondary) | 17.9±0.05 km/s |
| Details | |
| Aa | |
| Mass | 1.09 M☉ |
| Radius | 1.1 R☉ |
| Luminosity | 1.82±0.04 L☉ |
| Surface gravity (log g) | 5 cgs |
| Temperature | 5,802 K |
| Metallicity [Fe/H] | −0.09±0.11 dex |
| Rotational velocity (v sin i) | 7 km/s |
| Age | 5.01±4.51 Gyr |
| Ab | |
| Mass | 0.64 M☉ |
| B | |
| Mass | 1±0.1 M☉ |
| Luminosity | 0.98+0.25 −0.20 L☉ |
| Temperature | 5,741 K |
| Age | 4.79+1.24 −0.98 Gyr |
| Other designations | |
| 3 G. Octantis, CPD−83°27, GC 2063, GJ 67.1, HD 10800, HIP 7601, HR 512, SAO 258271, WDS J01379-8259AB | |
| Database references | |
| SIMBAD | data |
HD 10800, also known as HR 512 or Gliese 67.1, is a triple star located in the southern circumpolar constellation Octans. It has a combined apparent magnitude of 5.87, allowing it to be faintly seen with the naked eye. The system is relatively close at a distance of 88.1 light years but is drifting closer with a heliocentric radial velocity −1.1 km/s.
The system has a blended spectral classification of G1 V, indicating an ordinary G-type main-sequence star. The primary is a spectroscopic binary consisting of a G-type and K-type star circling around each other in 19 days. HD 10800B has a class of G2 V, the same spectral class as our own Sun. The AB pair take 1.7 years to orbit each other.