| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 48m 00.37471s[1] |
| Declination | +40° 31′ 50.2940″[1] |
| Apparent magnitude (V) | 7.25[2] |
| Characteristics | |
| Evolutionary stage | Subgiant[1] |
| Spectral type | F8 |
| B−Vcolor index | 0.634±0.009[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.18±0.13[1] km/s |
| Proper motion (μ) | RA: 52.742±0.039mas/yr[1] Dec.: 21.740±0.026mas/yr[1] |
| Parallax (π) | 19.3247±0.0306 mas[1] |
| Distance | 168.8 ± 0.3 ly (51.75 ± 0.08 pc) |
| Absolute magnitude (MV) | 3.74[2] |
| Details[3] | |
| Mass | 1.2±0.04 M☉ |
| Radius | 1.53±0.04 R☉ |
| Luminosity | 2.63±0.03 L☉ |
| Surface gravity (log g) | 4.14±0.03 cgs |
| Temperature | 5,953±48 K |
| Metallicity [Fe/H] | 0.32±0.05[4] dex |
| Rotational velocity (v sin i) | 3.59±0.59[4] km/s |
| Age | 5.0±0.7 Gyr |
| Other designations | |
| BD+40º835,HD 23596,HIP 17747,SAO 39110,WDS J03480+4032A[5] | |
| Database references | |
| SIMBAD | data |
HD 23596 is astar with an orbitingexoplanet companion in theconstellationPerseus. It has anapparent visual magnitude of 7.25,[2] which is too dim to be viewed with the naked eye. Based onparallax measurements, it is located at a distance of 169 light years from the Sun. The system is drifting closer with aradial velocity of −10 km/s.[1]
Thestellar classification of this star is F8, making it anF-type star with an undefinedluminosity class. It is 20% more massive than the Sun and has 153% of the Sun's girth. The visualluminosity of the star is 2.63 times greater than theSun, which it is radiating from itsphotosphere at aneffective temperature of 5,953 K. It has an estimated age of five billion years,[3] and is spinning with aprojected rotational velocity of 3.6 km/s. The star is considered metal-rich, having a higher surface abundance of iron compared to the Sun.[4]
In June 2002, a massive long-periodexoplanet orbiting the star was announced.[4] In 2022, the inclination and true mass of HD 23596 b were measured viaastrometry.[6] It is orbiting at a distance of2.7 AU from the host star with anorbital period of 4.2 years and aneccentricity (ovalness) of 0.28. This body has a mass around 12 times that of the planetJupiter.
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (years) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 11.914+0.990 −1.768 MJ | 2.694+0.107 −0.118 | 4.203+0.021 −0.025 | 0.282+0.017 −0.014 | 38.898+15.759 −77.179° | — |
