Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Octans |
Right ascension | 01h 37m 55.5567s [1] |
Declination | −82° 58′ 29.9867″ [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 |
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 [6] | |
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 [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 | |
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]
The primary (Aa) has 109% the mass of the Sun [7] and a radius 1.1 times that of the Sun. [8] It radiates at 1.82 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 5,802 K, [11] giving a yellow hue. HD 10800A has a metallicity 81% that of the Sun, making it slightly metal deficient. [12] At an age of 5 billion years, [9] it spins with a projected rotational velocity of 7 km/s. [7] The close companion (Ab) has a mass 69% that of the Sun. [13]
HD 10800B, the slightly distant companion, has the same mass of the Sun but is slightly cooler (37 K difference) and dimmer, with a luminosity 98% that of the Sun. [9] The object is only marginally older than the Sun at an age of 4.8 billion years. [9]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Octans |
Right ascension | 01h 37m 55.5567s [1] |
Declination | −82° 58′ 29.9867″ [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 |
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 [6] | |
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 [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 | |
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]
The primary (Aa) has 109% the mass of the Sun [7] and a radius 1.1 times that of the Sun. [8] It radiates at 1.82 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 5,802 K, [11] giving a yellow hue. HD 10800A has a metallicity 81% that of the Sun, making it slightly metal deficient. [12] At an age of 5 billion years, [9] it spins with a projected rotational velocity of 7 km/s. [7] The close companion (Ab) has a mass 69% that of the Sun. [13]
HD 10800B, the slightly distant companion, has the same mass of the Sun but is slightly cooler (37 K difference) and dimmer, with a luminosity 98% that of the Sun. [9] The object is only marginally older than the Sun at an age of 4.8 billion years. [9]