Astronomy:HD 92788

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Short description: Star in the constellation Sextans
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
Distance113.1 ± 0.2 ly
(34.69 ± 0.06 pc)
Absolute magnitude (MV)4.56[2]
Details
Mass1.032[5] M☉
Radius1.14±0.01[1] R☉
Luminosity1.253±0.003[1] L☉
Surface gravity (log g)4.39[5] cgs
Temperature5,722+11
−22[1] K
Metallicity [Fe/H]0.22±0.05[6] dex
Rotation31.7[6] days
Age7.6±2.4[2] Gyr
Other designations
BD–01°2431, HD 92788, HIP 52409, SAO 137743, LTT 3928, 2MASS J10424853-0211011[7]
Database references
SIMBADdata
Exoplanet Archivedata

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]

The HD 92788 planetary system[5]
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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. 
  7. ↑ "HD 92788". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+92788. 
  8. ↑ 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. 
  9. ↑ "hd_92788_b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_92788_b--114/. 
  10. ↑ 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. 
  11. ↑ 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

Coordinates: Sky map 10h 42m 48.5287s, −02° 11′ 01.521″



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