HD 92788 is a star in the equatorial constellation of Sextans. It has a yellow hue but is too dim to be visible to the naked eye, having an apparent visual magnitude of 7.31.[2] The star is located at a distance of 113 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −4.5 km/s.[4] Two planets have been found in orbit around the star.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 42m 48.52807s[1] |
| Declination | −02° 11′ 01.5221″[1] |
| Apparent magnitude (V) | 7.31[2] |
| Characteristics | |
| Spectral type | G6V[3] |
| B−V color index | 0.694±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.455±0.0518[4] km/s |
| Proper motion (μ) | RA: −15.128±0.080[1] mas/yr Dec.: −223.230±0.061[1] mas/yr |
| Parallax (π) | 28.8281 ± 0.0493 mas[1] |
| Distance | 113.1 ± 0.2 ly (34.69 ± 0.06 pc) |
| Absolute magnitude (MV) | 4.56[2] |
| Details | |
| Mass | 1.032[5] M☉ |
| Radius | 1.14±0.01[1] R☉ |
| Luminosity | 1.253±0.003[1] L☉ |
| Surface gravity (log g) | 4.39[5] cgs |
| Temperature | 5,722+11 −22[1] K |
| Metallicity [Fe/H] | 0.22±0.05[6] dex |
| Rotation | 31.7[6] days |
| Age | 7.6±2.4[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
This is a G-type main-sequence star with a stellar classification of G6V.[3] It is estimated to be around eight billion years old and is spinning with a rotation period of 31.7 days.[6] The star has a similar mass to the Sun and is slightly larger in radius, with a high metallicity. It is radiating 1.25[1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,722 K.[1]
Planetary system
An extrasolar planet was discovered orbiting this star in 2001 by means of the radial velocity method. Designated component 'b', it is a Super-Jupiter or possibly a low-mass brown dwarf with an orbital period of 0.89 years.[6] The star rotates at an inclination of 8+14
−8 degrees relative to Earth.[8] It is probable that this planet shares that inclination.[9][10]
A low-mass brown dwarf companion was announced in 2019. Designated component 'c', it orbiting with a period of around 27 years and a semimajor axis of 9.4 AU.[11]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥3.78±0.18 MJ | 0.971±0.023 | 325.72±0.03 | 0.351±0.004 | — | — |
| c | ≥3.64±0.69 MJ | 9.43±0.63 | 9,857±926 | 0.18±0.08 | — | — |
See also
References
External links
- "Notes for star HD 92788". Extrasolar Planets Encyclopaedia. Archived from the original on November 6, 2007. Retrieved 2008-08-30.