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HD 89307 is a star in the equatorial constellation of Leo. It is too faint to be viewed with the naked eye except under ideal conditions, having an apparent visual magnitude of 7.02.[2] The star is located at a distance of 104 light-years (32 parsecs) from the Sun based on parallax, and is drifting further away with a radial velocity of +23 km/s.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 10h 18m 21.28771s[1] |
| Declination | +12° 37′ 15.9909″[1] |
| Apparent magnitude (V) | 7.02[2] |
| Characteristics | |
| Spectral type | G0V[3] |
| B−V color index | 0.594±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | +23.27±0.13[1] km/s |
| Proper motion (μ) | RA: −272.659 mas/yr[1] Dec.: −39.333 mas/yr[1] |
| Parallax (π) | 31.4134 ± 0.0226 mas[1] |
| Distance | 103.83 ± 0.07 ly (31.83 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.57[4] |
| Details[4] | |
| Mass | 1.028±0.04 M☉ |
| Radius | 1.08+0.01 −0.02[5] R☉ |
| Luminosity | 1.354±0.003[5] L☉ |
| Surface gravity (log g) | 4.414±0.10 cgs |
| Temperature | 5,950±44 K |
| Metallicity [Fe/H] | −0.15±0.02[2] dex |
| Rotation | 23.7 d |
| Rotational velocity (v sin i) | 3.21±0.50 km/s |
| Age | 5.3+2.7 −2.9 Gyr[2] 6.76[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an ordinary G-type main-sequence star with a stellar classification of G0V.[3] It is chromospherically inactive and appears older than the Sun with a rotation period of 23.7 days.[4] The star has about the same mass[4] as the Sun and is 8% larger. It is radiating 1.35[5] times the Sun's luminosity from its photosphere at an effective temperature of 5,950 K.[4]
In December 2004, using the radial velocity method, it was found to have a long-period giant planet in orbit around it.[4] The parameters of HD 89307 b were updated in 2012,[7] and in 2023 its inclination and true mass were determined via astrometry.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.02+0.27 −0.15 MJ |
3.331+0.052 −0.053 |
5.991+0.081 −0.078 |
0.174+0.041 −0.043 |
72+13 −15 or 108+15 −13° |
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