| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 34m 03.18984s[1] |
| Declination | −01° 34′ 05.5822″[1] |
| Apparent magnitude (V) | 7.46[2] |
| Characteristics | |
| Spectral type | G2V[3] |
| B−Vcolor index | +0.612±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −18.29±0.12[1] km/s |
| Proper motion (μ) | RA: −112.313±0.026mas/yr[1] Dec.: −96.386±0.018mas/yr[1] |
| Parallax (π) | 19.2582±0.0271 mas[1] |
| Distance | 169.4 ± 0.2 ly (51.93 ± 0.07 pc) |
| Absolute magnitude (MV) | 3.98[2] |
| Details[4] | |
| Mass | 1.07±0.02 M☉ |
| Radius | 1.38±0.02 R☉ |
| Luminosity | 2.16±0.01 L☉ |
| Surface gravity (log g) | 4.19±0.02 cgs |
| Temperature | 5,956±43 K |
| Metallicity [Fe/H] | −0.04±0.01[2] dex |
| Rotational velocity (v sin i) | 5.1[5] km/s |
| Age | 7.0±0.7 Gyr |
| Other designations | |
| BD−01°2075,Gaia DR2 3073443760538892032,HD 72659,HIP 42030,SAO 136045,2MASS J08340320-0134056[6] | |
| Database references | |
| SIMBAD | data |
HD 72659 is astar in theequatorialconstellation ofHydra. With anapparent visual magnitude of 7.46,[2] his yellow-hued star is too faint to be viewed with the naked eye.Parallax measurements provide a distance estimate of 169.4 light years from theSun, and it has anabsolute magnitude of 3.98.[2] The star is drifting closer with aradial velocity of −18.3 km/s.[1]
This is a Sun-likemain sequence star with astellar classification of G2V,[3] indicating that it is generating energy throughcorehydrogen fusion. It is older than the Sun with an age of about seven billion years,[4] and is spinning with aprojected rotational velocity of 5.1 km/s.[5] The star has 7% greater mass than the Sun and a 38% larger radius. It is radiating more than double theSun's luminosity from itsphotosphere at aneffective temperature of 5,956 K.[4] Themetallicity of thestellar atmosphere is similar to the Sun.[2]
Anextrasolar planet was discovered orbiting this star in 2003 via theDoppler method.[7] This is asuperjovian planet with an eccentric orbit, completing a lap around its host star every 9.9 years.[8] In 2022, the inclination and true mass of HD 72659 b were measured viaastrometry, along with the detection of a second substellar companion, likely abrown dwarf.[9]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (years) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.988+2.586 −0.098 MJ | 4.691+0.185 −0.202 | 9.718+0.052 −0.043 | 0.257+0.014 −0.016 | 77.583+39.898 −39.755° | — |
| c | 18.806+4.442 −4.796 MJ | 13.959+0.884 −0.861 | 49.850+3.805 −3.287 | 0.091+0.055 −0.048 | 14.279+4.366 −2.678° | — |
