HD 126614
Multiple star system in the constellation Virgo
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HD 126614 is a trinary star[15] system in the equatorial constellation of Virgo. The primary member, designated component A, is host to an exoplanetary companion. With an apparent visual magnitude of 8.81,[1] it is too faint to be seen with the naked eye. The system is located at a distance of 239 light years from the Sun based on parallax measurements,[2] but is drifting closer with a radial velocity of −33 km/s.[9]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Virgo[1] |
| HD 126614 A | |
| Right ascension | 14h 26m 48.27949s[2] |
| Declination | −05° 10′ 40.0131″[2] |
| Apparent magnitude (V) | 8.81±0.03[3] |
| LP 680-57 | |
| Right ascension | 14h 26m 45.83640s[4] |
| Declination | −05° 10′ 19.4279″[4] |
| Apparent magnitude (V) | 16.68±0.20[3] |
| Characteristics | |
| A | |
| Evolutionary stage | subgiant[2] |
| Spectral type | G8IV[5] |
| Apparent magnitude (B) | 9.620[1] |
| Apparent magnitude (J) | 7.470±0.021[1] |
| Apparent magnitude (H) | 7.160±0.042[1] |
| Apparent magnitude (K) | 7.060±0.036[1] |
| B−V color index | 0.810±0.004[1] |
| C | |
| Evolutionary stage | main sequence[6] |
| Spectral type | M[7] |
| B | |
| Evolutionary stage | main sequence[8] |
| Spectral type | M5.5V[6] |
| Astrometry | |
| HD 126614 A | |
| Radial velocity (Rv) | −32.897±0.0042[9] km/s |
| Proper motion (μ) | RA: −149.760±0.023 mas/yr[2] Dec.: −145.837±0.018 mas/yr[2] |
| Parallax (π) | 13.6633±0.0166 mas[2] |
| Distance | 238.7 ± 0.3 ly (73.19 ± 0.09 pc) |
| Absolute magnitude (MV) | 4.52[1] |
| LP 680-57 | |
| Radial velocity (Rv) | −29.45±5.52[4] km/s |
| Proper motion (μ) | RA: −147.861±0.038 mas/yr[4] Dec.: −149.118±0.034 mas/yr[4] |
| Parallax (π) | 13.6050±0.0316 mas[4] |
| Distance | 239.7 ± 0.6 ly (73.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 12.02[7] |
| Orbit[10] | |
| Primary | HD 126614 A |
| Name | HD 126614 C |
| Period (P) | 59.979+4.696 −5.059 yr |
| Semi-major axis (a) | 15.229+0.984 −1.094 AU |
| Eccentricity (e) | 0.056+0.017 −0.018 |
| Inclination (i) | 16.294+0.881 −0.771° |
| Longitude of the node (Ω) | 284.664+2.600 −3.304° |
| Periastron epoch (T) | 2450124.747+26.090 −28.486 |
| Argument of periastron (ω) (secondary) | 240.567+30.578 −43.150° |
| Semi-amplitude (K1) (primary) | 0.167573+0.012902 −0.011124 km/s |
| Details | |
| HD 126614 A | |
| Mass | 0.955[11] M☉ |
| Radius | 1.32[11] R☉ |
| Luminosity | 1.44[11] L☉ |
| Surface gravity (log g) | 4.18[11] cgs |
| Temperature | 5,503[11] K |
| Metallicity | +0.42[11] |
| Rotation | ~99 days[7] |
| Rotational velocity (v sin i) | 2.0±0.5[7] km/s |
| Age | 7.2±2.0[7] Gyr |
| HD 126614 C | |
| Mass | 81.128+7.778 −7.922[10] MJup |
| LP 680-57 (B) | |
| Mass | 0.32[12][8] M☉ |
| Radius | 0.32[12][8] R☉ |
| Luminosity | 0.0106[12] L☉ |
| Surface gravity (log g) | 4.93[12] cgs |
| Temperature | 3,275[12][8] K |
| Metallicity [Fe/H] | +0.46[6] dex |
| Age | 3.6 – 6.0[6] Gyr |
| Other designations | |
| HD 126614, WDS J14268-0511[13] | |
| HD 126614 A: BD−04°3690, HIP 70623, SAO 139932, PPM 197558, G 124-40, LTT 5698, NLTT 37355[13] | |
| LP 680-57: LP 680-57, NLTT 37349[14] | |
| Database references | |
| SIMBAD | A |
| LP 680-57 | |
| Exoplanet Archive | data |
Stellar system
HD 126614 A
The primary is a late G-type star with a stellar classification of G8IV.[5] It is a super metal-rich star; among the most metal-rich stars currently known.[16] This is most likely an evolving subgiant star, but the very high metallicity makes comparisons to standard spectral types difficult.[17]
HD 126614 C
In 2010, a close stellar companion was resolved and designated component C. This object is a faint red dwarf at an angular separation of 0.5″, which corresponds to a projected physical separation of ~ 36 AU.[17] More recent observations using radial velocity and astrometry have refined the parameters of HD 126614 C. It has an orbital period of about 60 years, with a smaller semi-major axis of 15 AU and a very low mass of 81.1 MJ.[10] This mass is very near the mass limit allowed for hydrogen fusion.
HD 126614 B
The outer companion, designated LP 680-57, was first reported in 1960 with the W. J. Luyten proper motion catalog.[18] It is a magnitude 17.0 red dwarf with a class of M5.5,[6] located at an angular separation of 41.90″ from the primary along a position angle of 299°, as of 2015.[18] They have a physical projected separation of 3,040 AU.[6] The common proper motion of the system has been confirmed, indicating that they are gravitationally bound.[17] Many multiple star catalogues still refer to this companion as component B, as it was known prior to the discovery of the closer companion.[18]
Planetary system
A Doppler search for giant planets begun in 1997 at the Keck Observatory provided an 11 year baseline for detecting periodicity in the primary star's radial velocity data. In 2010, a Jovian companion was announced with an orbital period of 3.41 years.[7] In 2022, the inclination and true mass of HD 126614 Ab were measured via astrometry.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 0.41+0.20 −0.06 MJ |
2.29±0.03 | 3.442+0.016 −0.017[10] |
0.55±0.06 | 90±40 | — |