| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10 42 48.52807 |
| Declination | −02° 11′ 01.5221″ |
| Apparent magnitude (V) | 7.31 |
| Characteristics | |
| Spectral type | G6V |
| B−V color index | 0.694±0.005 |
| Astrometry | |
| Radial velocity (Rv) | −4.455±0.0518 km/s |
| Proper motion (μ) | RA: −15.128±0.080 mas/yr Dec.: −223.230±0.061 mas/yr |
| Parallax (π) | 28.8281 ± 0.0493 mas |
| Distance | 113.1 ± 0.2 ly (34.69 ± 0.06 pc) |
| Absolute magnitude (MV) | 4.56 |
| Details | |
| Mass | 1.032 M☉ |
| Radius | 1.14±0.01 R☉ |
| Luminosity | 1.253±0.003 L☉ |
| Surface gravity (log g) | 4.39 cgs |
| Temperature | 5,722+11 −22 K |
| Metallicity | 0.22±0.05 dex |
| Rotation | 31.7 days |
| Age | 7.6±2.4 Gyr |
| Other designations | |
| BD–01°2431, HD 92788, HIP 52409, SAO 137743, LTT 3928, 2MASS J10424853-0211011 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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. 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. Two planets have been found in orbit around the star.
This is a G-type main-sequence star with a stellar classification of G6V. It is estimated to be around eight billion years old and is spinning with a rotation period of 31.7 days. The star has a similar mass to the Sun and is slightly larger in radius, with a high metallicity. It is radiating 1.25 times the luminosity of the Sun from its photosphere at an effective temperature of 5,722 K.
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. The star rotates at an inclination of 8
−8 degrees relative to Earth. It is probable that this planet shares that inclination.
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.
| 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
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
- ^ Wittenmyer, Robert A.; et al. (April 2019). "Truly eccentric - I. Revisiting eight single-eccentric planetary systems". Monthly Notices of the Royal Astronomical Society. 484 (4): 5859–5867. arXiv:1901.08471. Bibcode:2019MNRAS.484.5859W. doi:10.1093/mnras/stz290.
- ^ Fischer, Debra A.; et al. (2001). "Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets". The Astrophysical Journal. 551 (2): 1107–1118. Bibcode:2001ApJ...551.1107F. doi:10.1086/320224.
- "HD 92788". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-02.
- Simpson, E. K.; et al. (November 2010). "Rotation periods of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 408 (3): 1666–1679. arXiv:1006.4121. Bibcode:2010MNRAS.408.1666S. doi:10.1111/j.1365-2966.2010.17230.x. S2CID 6708869.
- "hd_92788_b". Extrasolar Planets Encyclopaedia. Retrieved November 12, 2012.
- Sanchis-Ojeda, Roberto; et al. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten. 334 (1–2): 180–183. arXiv:1211.2002. Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765. S2CID 38743202.
- Rickman, E. L.; et al. (May 2019). "The CORALIE survey for southern extrasolar planets. XVIII. Three new massive planets and two low-mass brown dwarfs at greater than 5 AU separation". Astronomy & Astrophysics. 625: 16. arXiv:1904.01573. Bibcode:2019A&A...625A..71R. doi:10.1051/0004-6361/201935356. S2CID 91184450. A71.
External links
- "Notes for star HD 92788". Extrasolar Planets Encyclopaedia. Archived from the original on November 6, 2007. Retrieved 2008-08-30.
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