Astronomy:HD 92788
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 |
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]
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 astronomical unit|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
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ 4.0 4.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode: 2018A&A...616A...7S.
- ↑ 5.0 5.1 5.2 5.3 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. doi:10.1093/mnras/stz290. Bibcode: 2019MNRAS.484.5859W.
- ↑ 6.0 6.1 6.2 6.3 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. doi:10.1086/320224. Bibcode: 2001ApJ...551.1107F.
- ↑ "HD 92788". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+92788.
- ↑ Simpson, E. K. et al. (November 2010). "Rotation periods of exoplanet host stars". Monthly Notices of the Royal Astronomical Society 408 (3): 1666–1679. doi:10.1111/j.1365-2966.2010.17230.x. Bibcode: 2010MNRAS.408.1666S.
- ↑ "hd_92788_b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_92788_b--114/.
- ↑ Sanchis-Ojeda, Roberto et al. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten 334 (1–2): 180–183. doi:10.1002/asna.201211765. Bibcode: 2013AN....334..180S.
- ↑ 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. doi:10.1051/0004-6361/201935356. A71. Bibcode: 2019A&A...625A..71R.
External links
- "Notes for star HD 92788". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+92788. Retrieved 2008-08-30.
Coordinates: 
10h 42m 48.5287s, −02° 11′ 01.521″
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