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. Bibcode2018A&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. Bibcode2012AstL...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. Bibcode1999MSS...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. Bibcode2018A&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. Bibcode2019MNRAS.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. Bibcode2001ApJ...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. Bibcode2010MNRAS.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. Bibcode2013AN....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. Bibcode2019A&A...625A..71R. 

External links

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