HD 142022

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]
Distance111.70 ± 0.07 ly
(34.25 ± 0.02 pc)
Absolute magnitude (MV)5.02[2]
Details[5][3]
A
Mass0.972+0.036
−0.029 M☉
Radius1.028+0.011
−0.012 R☉
Luminosity0.886±0.001[6] L☉
Surface gravity (log g)4.386±0.251 cgs
Temperature5,516±31 K
Metallicity [Fe/H]0.24±0.073 dex
Rotational velocity (v sin i)2.048±0.214 km/s
Age7.667+1.704
−1.764 Gyr
B
Mass0.60±0.07 M☉
Radius0.56±0.05 R☉
Luminosity0.063±0.014 L☉
Temperature3,892±95 K
Other designations
CD−83° 202, GC 21507, GJ 9536, HD 142022, HIP 79242, SAO 258738, LTT 6382, GCRV 65757[7]
Database references
SIMBADdata

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±0.062 5.297+0.082
−0.073 		0.506+0.071
−0.06 		71±13 or 109±13° —

See also

References

  1. ^ a b c d e f 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. ^ a b c d 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. ^ a b c d e 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. ^ a b 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. ^ a b c 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. ^ a b 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. ^ a b c d 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. ^ a b 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.