HD 116029 is a binary star system about 400 light-years away.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Coma Berenices |
Right ascension | 13h 20m 39.5422s[1] |
Declination | +24° 38′ 55.3099″[1] |
Apparent magnitude (V) | 7.89[2] |
Characteristics | |
Evolutionary stage | subgiant |
Spectral type | K1IV+M[3] |
B−V color index | 1.009[4] |
Astrometry | |
Radial velocity (Rv) | -6.42 km/s |
Proper motion (μ) | RA: -14.495 mas/yr Dec.: -52.193 mas/yr |
Parallax (π) | 8.0853 ± 0.0384 mas[5] |
Distance | 403 ± 2 ly (123.7 ± 0.6 pc) |
Orbit[3] | |
Primary | HD 116029 A |
Companion | HD 116029 B |
Semi-major axis (a) | 1.392" (171 AU) |
Details[3] | |
HD 116029 A | |
Mass | 1.445±0.094[2] M☉ |
Radius | 4.6±0.1[4] R☉ |
Luminosity | 11.7[6] L☉ |
Surface gravity (log g) | 3.40±0.06 cgs |
Temperature | 4894±36[2] K |
Metallicity | 0.12 ± 0.02[2] |
Rotational velocity (v sin i) | 1.0±0.6[2] km/s |
Age | 2.7±0.5[6] Gyr |
HD 116029 B | |
Mass | 0.26 M☉ |
Surface gravity (log g) | 5.033±0.019 cgs |
Other designations | |
Database references | |
SIMBAD | data |
The primary subgiant star HD 116029 A belongs to the spectral class K1. Its age is younger than the Sun`s at 2.7±0.5 billion years.[6] The primary star is slightly enriched by heavy elements, having 130% of solar abundance.[4] The primary star does not have detectable flare activity.[7]
In 2016 the co-moving binary stellar companion HD 116029 B was detected. It is a red dwarf star of visual magnitude 16.[8] The companion was confirmed orbiting the primary at a projected separation of 171 AU in 2017.[3]
Planetary system
In 2011 one superjovian planet, HD 116029 b, on a mildly eccentric orbit around star HD 116029 A was discovered utilizing the radial velocity method.[4] One more planet on a wider orbit was detected in 2016. The planets b and c are orbiting in a 2:3 orbital resonance.[9]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
HD 116029 A b | ≥2.1±0.2 MJ | 1.73±0.04 | 670.2±8.3 | <0.21 | — | — |
HD 116029 A c | ≥1.27±0.1 MJ | — | 907±30 | 0.038+0.127 −0.038 |
— | — |
References
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