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 606.1, 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

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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