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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.

HD 10800A

The primary (Aa) has 109% the mass of the Sun and a radius 1.1 times that of the Sun. It radiates at 1.82 times the luminosity of the Sun from its photosphere at an effective temperature of 5,802 K, giving a yellow hue. HD 10800A has a metallicity 81% that of the Sun, making it slightly metal deficient. At an age of 5 billion years, it spins with a projected rotational velocity of 7 km/s. The close companion (Ab) has a mass 69% that of the Sun.

HD 10800B

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. The object is only marginally older than the Sun at an age of 4.8 billion years.

References

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v t e Constellation of Octans
List of stars in Octans Octans in Chinese astronomy
Stars	Bayer α β γ γ γ δ ε ζ η θ ι κ λ μ μ ν ξ ο π π ρ σ (Polaris Australis) τ υ φ χ ψ ω Variable R BQ CK CW FT HR 47 512 525 4595 6837 6912 7698 7785 7812 8234 8380 8432 8526 8577 8786 8935 8957 8995 HD 142022 166066 212301 Other Gliese 877 LHS 475 TOI-4342 W2150AB
Exoplanets 2MASS J2126–8140 HD 142022 Ab HD 212301 b LHS 475 b
Galaxies	NGC 2573 7095 7098 Other PGC 10922
Category

• G-type main-sequence stars
• K-type stars
• Spectroscopic binaries
• Octans
• Gould objects
• Gliese and GJ objects
• Durchmusterung objects
• Henry Draper Catalogue objects
• Bright Star Catalogue objects
• Hipparcos objects
• Triple star systems