HD 10800
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 01h 37m 55.5567s[1] |
| Declination | −82° 58′ 29.987″[1] |
| Apparent magnitude (V) | 5.87[2] |
| Characteristics | |
| Spectral type | G1 V[3] |
| U−B color index | +0.10[2] |
| B−V color index | +0.61[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.1±0.4[4] km/s |
| Proper motion (μ) | RA: +122.526 mas/yr[1] Dec.: +120.827 mas/yr[1] |
| Parallax (π) | 37.0128±0.229 mas[1] |
| Distance | 88.1 ± 0.5 ly (27.0 ± 0.2 pc) |
| Absolute magnitude (MV) | +3.69[5] |
| Orbit[6] | |
| Primary | Aa |
| Name | 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[6] | |
| Primary | A |
| Name | 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[7] M☉ |
| Radius | 1.1[8] R☉ |
| Luminosity | 1.82±0.04[9] L☉ |
| Surface gravity (log g) | 5[10] cgs |
| Temperature | 5,802[11] K |
| Metallicity [Fe/H] | −0.09±0.11[12] dex |
| Rotational velocity (v sin i) | 7[7] km/s |
| Age | 5.01±4.51[9] Gyr |
| Ab | |
| Mass | 0.64[13] M☉ |
| B | |
| Mass | 1±0.1[9] M☉ |
| Luminosity | 0.98+0.25 −0.20[9] L☉ |
| Temperature | 5,741[7] K |
| Age | 4.79+1.24 −0.98[9] Gyr |
| Other designations | |
| 3 G. Octantis[14], CPD−83°27, GC 2063, GJ 67.1, HD 10800, HIP 7601, HR 512, SAO 258271, WDS J01379-8259AB[15] | |
| 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,[2] allowing it to be faintly seen with the naked eye. The system is relatively close at a distance of 88.1 light years[1] but is drifting closer with a heliocentric radial velocity −1.1 km/s.[4]
The system has a blended spectral classification of G1 V,[3] 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.[6] HD 10800B has a class of G2 V,[9] the same spectral class as our own Sun. The AB pair take 1.7 years to orbit each other.[6]
