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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