HD 116029

HD 116029 is a binary star system about 400 light-years away.

HD 116029

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
BD+25 26232, Gaia DR2 1446584503287858560, HD 116029, HIP 65117, TYC 1994-2335-1, 2MASS J13203954+2438555[1]
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]

The HD 116029 planetary system^[4][10]

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	—	—