01h26m 08.78637s[1]
+34° 34′ 46.9318″[1]
6.34[2]
Characteristics
F7 V + M2 V[3]
B−V color index
0.500±0.004[2]
Radial velocity (Rv)
19.08±0.14[1] km/s
Proper motion (μ)
RA: 236.271±0.030 mas/yr[1]
Dec.: −84.632±0.022 mas/yr[1]
Parallax (π)
124.5 ± 0.2 ly
(38.16 ± 0.05 pc)
Absolute magnitude (MV)
3.56[2]
Semi-major axis (a)
35–60 AU
Eccentricity (e)
< 0.5
Inclination (i)
75–85°
Details[4]
HD 8673 A
1.36±0.20 M☉
1.521±0.049 R☉
3.37+0.51
−0.44 L☉
Surface gravity (log g)
4.21 cgs
6,340 K
Metallicity [Fe/H]
0.15 dex
Rotational velocity (v sin i)
26.9 km/s
1.5+2.1
−0.6 Gyr
HD 8673 B
Database references
HD 8673 is a binary star in the northern constellationofAndromeda. It has an apparent magnitude and absolute magnitude of 6.34 and 3.56 respectively.[2] Based upon an annual parallax shiftof26.2 mas, the system is located around 124.5 light years away. The system is moving further from the Earth with a heliocentric radial velocity of +19 km/s.[1] A sub-stellar companion was detected in 2005; it could either be an exoplanet or a brown dwarf.
The primary component is an F-type main-sequence star with a stellar classification of F7 V.[3] It has 1.36 times the mass of the Sun and 1.52 times the Sun's radius. The star is around 1.5 billion years old and is spinning with a projected rotational velocity of 26.9 km/s. It is radiating 3.4 times the Sun's luminosity from its photosphere at an effective temperature of 6,340 K.[4]
Speckle interferometry measurements of this star between 2001 and 2008 showed a candidate stellar companion to this star, announced in 2011. It was unclear whether the pair formed a visual double or a binary system. The authors of the study estimated a class of K2 V, based upon a visual magnitude difference of 2.3±0.5.[6] Subsequent observations using adaptive options did not spot this companion and it was concluded this was a false detection. However, a low mass stellar companion was detected in a wide orbit. This red dwarf star has 0.33–0.45 times the mass of the Sun and is orbiting with a semimajor axisof35–60 AU.[3]
An orbiting sub-stellar companion with a minimum mass 14 times that of Jupiter in a high-eccentricity orbit was discovered in 2005 and confirmed in 2010. This object orbits at 3 AU away from the primary star with a period of 1,634 days and an eccentricity of 0.7.[7] In 2022, the inclination and true mass of HD 8673 Ab were measured via astrometry.[8]
The HD 8673 A planetary system[8]
Companion
(in order from star)
b
13.248+1.688
−1.416 MJ
2.970+0.147
−0.171
4.503+0.030
−0.043
0.730+0.042
−0.026
95.450+19.444
−8.816°
—
Other
Other
NGC
NGC
Numbered
Other