HD 142022

Last updated
HD 142022
Observation data
Epoch J2000       Equinox J2000
Constellation Octans
Right ascension 16h 10m 15.02895s [1]
Declination −84° 13′ 53.8108″ [1]
Apparent magnitude  (V)7.70 [2] + 11.19 [3]
Characteristics
Spectral type G9IV-V [4] + M1V [3]
B−V color index 0.79±0.01 [2]
Astrometry
Radial velocity (Rv)−9.96±0.13 [1]  km/s
Proper motion (μ)RA: −337.270  mas/yr [1]
Dec.: −31.386  mas/yr [1]
Parallax (π)29.1991 ± 0.0172  mas [1]
Distance 111.70 ± 0.07  ly
(34.25 ± 0.02  pc)
Absolute magnitude  (MV)5.02 [2]
Details [5] [3]
A
Mass 0.972+0.036
−0.029  M☉
Radius 1.028+0.011
−0.012  R☉
Luminosity 0.886±0.001 [6]   L☉
Surface gravity (log g)4.386±0.251  cgs
Temperature 5,516±31  K
Metallicity [Fe/H]0.24±0.073  dex
Rotational velocity (v sin i)2.048±0.214 km/s
Age 7.667+1.704
−1.764  Gyr
B
Mass 0.60±0.07  M☉
Radius 0.56±0.05  R☉
Luminosity0.063±0.014  L☉
Temperature 3,892±95  K
Other designations
CD−83° 202, GC  21507, GJ  9536, HD  142022, HIP  79242, SAO  258738, LTT  6382, GCRV  65757 [7]
Database references
SIMBAD data

HD 142022 is a binary star [8] system located in the southernmost constellation of Octans. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 7.70. [2] The distance to this system is 112 light-years (34 parsecs ) based on parallax, but it is drifting closer to the Sun with a radial velocity of −10 km/s. [1]

The primary, designated component A, is an old, [8] Population I G-type star with a stellar classification of G9IV-V, [4] showing a spectrum with mixed traits of a main sequence and a subgiant star. It is an estimated 7.6 billion years old and is spinning with a projected rotational velocity of 2 km/s. The star has similar mass and dimensions as the Sun, but has a 55% higher metallicity. [5] It is radiating 89% [6] of the luminosity of the Sun from its photosphere at an effective temperature of 5516 K. [5]

The magnitude 11.19 [3] companion has the designation LTT 6384 and appears gravitationally bound to the primary. The pair have an angular separation of 22  arcseconds , which corresponds to a projected separation of ~820  AU . The estimated semimajor axis of their orbit is 1,033 AU. [8] The secondary is a red dwarf star with a stellar classification of M1V. [3]

The primary star has a single known planetary companion, HD 142022 Ab, discovered in 2005. [8] In 2023, the inclination and true mass of HD 142022 Ab were determined via astrometry. [9]

The HD 142022 planetary system [9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b 4.51+0.91
−0.61  MJ 		2.939±0.0625.297+0.082
−0.073		0.506+0.071
−0.06		71±13 or 109±13 ° —

See also

Related Research Articles

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HD 178911 is a triple star system with an exoplanetary companion in the northern constellation of Lyra. With a combined apparent visual magnitude of 6.70, it is a challenge to view with the naked eye. The system is located at a distance of approximately 161 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −38 km/s.

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HD 86226 is a star with a pair of orbiting exoplanet companions, found in the constellation of Hydra. With an apparent visual magnitude of 7.93, it is too dim to be visible with the naked eye. The distance to this system has been determined by the parallax method, yielding a range of 149 light years. It is receding with a heliocentric radial velocity of +19.6 km/s. A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units.

HD 175167 is a star with an exoplanet companion in the southern constellation of Pavo. It is too faint to be visible with the naked eye at an apparent visual magnitude of 8.01. The system is located at a distance of 232 light-years from the Sun based on parallax measurements, and it is drifting further away with a radial velocity of 5 km/s. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.190 arcsec yr−1.

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References

  1. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 4 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.
  3. 1 2 3 4 5 Gaidos, E.; et al. (September 2014). "Trumpeting M dwarfs with CONCH-SHELL: a catalogue of nearby cool host-stars for habitable exoplanets and life". Monthly Notices of the Royal Astronomical Society. 443 (3): 2561–2578. arXiv: 1406.7353 . Bibcode:2014MNRAS.443.2561G. doi: 10.1093/mnras/stu1313 . S2CID   119234492.
  4. 1 2 Gray, R. O.; et al. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv: astro-ph/0603770 . Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID   119476992.
  5. 1 2 3 Soto, M. G.; Jenkins, J. S. (July 2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy & Astrophysics. 615: 28. arXiv: 1801.09698 . Bibcode:2018A&A...615A..76S. doi:10.1051/0004-6361/201731533. S2CID   119107228. A76.
  6. 1 2 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.
  7. ↑ "HD 142022". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-07-25.
  8. 1 2 3 4 Eggenberger; et al. (2006). "The CORALIE survey for southern extrasolar planets XIV. HD 142022 b: a long-period planetary companion in a wide binary". Astronomy and Astrophysics. 447 (3): 1159–1163. arXiv: astro-ph/0510561 . Bibcode:2006A&A...447.1159E. doi:10.1051/0004-6361:20053720. S2CID   18200070 . Retrieved December 12, 2007.
  9. 1 2 Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics . 23 (5): 055022. arXiv: 2303.12409 . Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e.
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