Summary
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]
| 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☉ |
| Luminosity | 0.063±0.014 L☉ |
| Temperature | 3,892±95 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
| 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 edit
References edit
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "HD 142022". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-25.
- ^ 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.
- ^ 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.