# HD 167042

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Star in the constellation Draco

HD 167042 Location of HD 167042 (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Draco[1] Right ascension 18h 10m 31.640s[2] Declination +54° 17′ 11.59″[2] Apparent magnitude (V) +5.97[3] Characteristics Evolutionary stage red giant branch[4][2] Spectral type K1 III[5] or K1 IV[3] U−B color index +0.716[6] B−V color index +0.934[6] Astrometry Radial velocity (Rv) −17.88[7] km/s Proper motion (μ) RA: +107.630 mas/yr[2] Dec.: +247.345 mas/yr[2] Parallax (π) 20.1313±0.0293 mas[2] Distance 162.0 ± 0.2 ly (49.67 ± 0.07 pc) Absolute magnitude (MV) 2.48[8] Details[9] Mass 1.4696±0.0532 M☉ Radius 4.4947±0.0576 R☉ Luminosity 10.717+0.924 −0.850 L☉ Surface gravity (log g) 3.3008±0.0050 cgs Temperature 4,926±79 K Metallicity [Fe/H] +0.093±0.061 dex Rotational velocity (v sin i) 0.68[7] km/s Age 7.413±0.829 Gyr Other designations BD+54°1950, GC 24820, HD 167042, HIP 89017, HR 6817, SAO 30784, PPM 36415, LTT 15382, Wolf 1415[10] Database references SIMBAD data Exoplanet Archive data

**HD 167042** is a [star](/source/Star) with an orbiting [exoplanet](/source/Exoplanet) in the northern [constellation](/source/Constellation) of [Draco](/source/Draco_(constellation)). With an [apparent visual magnitude](/source/Apparent_visual_magnitude) of +5.97,[3] the star is dimly visible to the naked eye. It is located at a distance of 162 [light years](/source/Light_year) based on [parallax](/source/Stellar_parallax) measurements,[2] but it is drifting closer with a [radial velocity](/source/Radial_velocity) of −18 km/s.[7] HD 167042 has a relatively large [proper motion](/source/Proper_motion), traversing the [celestial sphere](/source/Celestial_sphere) at an [angular rate](/source/Angular_rate) of 0.270″ yr−1.[11]

The [spectrum](/source/Stellar_spectrum) of HD 167042 presents as an [evolved](/source/Stellar_evolution) [K-type](/source/K-type_star) [giant star](/source/Giant_star), an orange giant, with a [stellar classification](/source/Stellar_classification) of K1 III.[5] The position of this star on the [H-R diagram](/source/H-R_diagram) is at the base of the [red giant branch](/source/Red_giant_branch).[4] When this star was a [main sequence](/source/Main_sequence), it was white-hued mid to late [A-type star](/source/A-type_star) based on its mass. It shows no significant [magnetic activity](/source/Magnetic_activity) in its [chromosphere](/source/Chromosphere).[8] The star has 1.88 times the mass of the Sun and has expanded to 4.49 times the Sun's radius. It is radiating 10.7 times the luminosity of the Sun from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,926 K.[9]

## Planetary system

On 28 November 2007, a [preprint](/source/Preprint) of the discovery of the exoplanet [HD 167042 b](/source/HD_167042_b) was posted to the [arXiv](/source/ArXiv) server. The [peer reviewed](/source/Peer_review) paper was then published in The [Astrophysical Journal](/source/Astrophysical_Journal) on 1 March 2008.[8] The discovery was later independently confirmed.[12] There is a long-period [radial velocity](/source/Radial_velocity) trend, which might indicate the presence of a second substellar companion.[13]

The HD 167042 planetary system[13] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b ≥1.397+0.031 −0.044 MJ 1.220±0.001 417.67+0.43 −0.41 0.010+0.033 −0.004 — —

## See also

- [HD 16175](/source/HD_16175)

- [Kappa Coronae Borealis](/source/Kappa_Coronae_Borealis)

- [List of extrasolar planets](/source/List_of_extrasolar_planets)

## References

1. **[^](#cite_ref-constellation_1-0)** [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=HD+167042&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR3_2-0) [***b***](#cite_ref-GaiaDR3_2-1) [***c***](#cite_ref-GaiaDR3_2-2) [***d***](#cite_ref-GaiaDR3_2-3) [***e***](#cite_ref-GaiaDR3_2-4) [***f***](#cite_ref-GaiaDR3_2-5) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D2149564787289902848%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Ligi2016_3-0) [***b***](#cite_ref-Ligi2016_3-1) [***c***](#cite_ref-Ligi2016_3-2) Ligi, R.; et al. (February 2016). "Radii, masses, and ages of 18 bright stars using interferometry and new estimations of exoplanetary parameters". *Astronomy & Astrophysics*. **586**: 23. [arXiv](/source/ArXiv_(identifier)):[1511.03197](https://arxiv.org/abs/1511.03197). [Bibcode](/source/Bibcode_(identifier)):[2016A&A...586A..94L](https://ui.adsabs.harvard.edu/abs/2016A&A...586A..94L). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201527054](https://doi.org/10.1051%2F0004-6361%2F201527054). [S2CID](/source/S2CID_(identifier)) [15941645](https://api.semanticscholar.org/CorpusID:15941645). A94.

1. ^ [***a***](#cite_ref-white2018_4-0) [***b***](#cite_ref-white2018_4-1) White, T. R.; et al. (July 2018). ["Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array"](https://doi.org/10.1093%2Fmnras%2Fsty898). *Monthly Notices of the Royal Astronomical Society*. **477** (4): 4403–4413. [arXiv](/source/ArXiv_(identifier)):[1804.05976](https://arxiv.org/abs/1804.05976). [Bibcode](/source/Bibcode_(identifier)):[2018MNRAS.477.4403W](https://ui.adsabs.harvard.edu/abs/2018MNRAS.477.4403W). [doi](/source/Doi_(identifier)):[10.1093/mnras/sty898](https://doi.org/10.1093%2Fmnras%2Fsty898). [S2CID](/source/S2CID_(identifier)) [48365395](https://api.semanticscholar.org/CorpusID:48365395).

1. ^ [***a***](#cite_ref-Sharma_et_al_2020_5-0) [***b***](#cite_ref-Sharma_et_al_2020_5-1) Sharma, Kaushal; et al. (January 2020). ["Application of convolutional neural networks for stellar spectral classification"](https://doi.org/10.1093%2Fmnras%2Fstz3100). *Monthly Notices of the Royal Astronomical Society*. **491** (2): 2280–2300. [arXiv](/source/ArXiv_(identifier)):[1909.05459](https://arxiv.org/abs/1909.05459). [Bibcode](/source/Bibcode_(identifier)):[2020MNRAS.491.2280S](https://ui.adsabs.harvard.edu/abs/2020MNRAS.491.2280S). [doi](/source/Doi_(identifier)):[10.1093/mnras/stz3100](https://doi.org/10.1093%2Fmnras%2Fstz3100).

1. ^ [***a***](#cite_ref-mnras172_667_6-0) [***b***](#cite_ref-mnras172_667_6-1) Jennens, P. A.; Helfer, H. L. (September 1975). ["A new photometric metal abundance and luminosity calibration for field G and K giants"](https://doi.org/10.1093%2Fmnras%2F172.3.667). *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*. **172** (3): 667–679. [Bibcode](/source/Bibcode_(identifier)):[1975MNRAS.172..667J](https://ui.adsabs.harvard.edu/abs/1975MNRAS.172..667J). [doi](/source/Doi_(identifier)):[10.1093/mnras/172.3.667](https://doi.org/10.1093%2Fmnras%2F172.3.667).

1. ^ [***a***](#cite_ref-Jofre2015_7-0) [***b***](#cite_ref-Jofre2015_7-1) [***c***](#cite_ref-Jofre2015_7-2) Jofré, E.; et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". *Astronomy & Astrophysics*. **574**: A50. [arXiv](/source/ArXiv_(identifier)):[1410.6422](https://arxiv.org/abs/1410.6422). [Bibcode](/source/Bibcode_(identifier)):[2015A&A...574A..50J](https://ui.adsabs.harvard.edu/abs/2015A&A...574A..50J). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201424474](https://doi.org/10.1051%2F0004-6361%2F201424474). [S2CID](/source/S2CID_(identifier)) [53666931](https://api.semanticscholar.org/CorpusID:53666931).

1. ^ [***a***](#cite_ref-Johnson2008_8-0) [***b***](#cite_ref-Johnson2008_8-1) [***c***](#cite_ref-Johnson2008_8-2) Johnson, John Asher; et al. (2008). "Retired A Stars and Their Companions. II. Jovian Planets Orbiting κ CrB and HD 167042". *The Astrophysical Journal*. **675** (1): 784–789. [arXiv](/source/ArXiv_(identifier)):[0711.4367](https://arxiv.org/abs/0711.4367). [Bibcode](/source/Bibcode_(identifier)):[2008ApJ...675..784J](https://ui.adsabs.harvard.edu/abs/2008ApJ...675..784J). [doi](/source/Doi_(identifier)):[10.1086/526453](https://doi.org/10.1086%2F526453). [S2CID](/source/S2CID_(identifier)) [12367629](https://api.semanticscholar.org/CorpusID:12367629).

1. ^ [***a***](#cite_ref-Lin2025_9-0) [***b***](#cite_ref-Lin2025_9-1) Lin, Wen-Xu; Qian, Sheng-Bang; Zhu, Li-Ying; Liao, Wen-Ping; Li, Fu-Xing; Shi, Xiang-Dong; Li, Lin-Jia; Zhao, Er-Gang (February 2025). ["Comprehensive Parameter Determination of Exoplanets through Asteroseismic Host Star Constraints"](https://doi.org/10.3847%2F1538-4357%2Fada60b). *The Astrophysical Journal*. **980** (2): 174. [arXiv](/source/ArXiv_(identifier)):[2502.18769](https://arxiv.org/abs/2502.18769). [Bibcode](/source/Bibcode_(identifier)):[2025ApJ...980..174L](https://ui.adsabs.harvard.edu/abs/2025ApJ...980..174L). [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ada60b](https://doi.org/10.3847%2F1538-4357%2Fada60b). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-SIMBAD_10-0)** ["HD 167042"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+167042). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-08-12.

1. **[^](#cite_ref-Lepine_Shara_2005_11-0)** Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". *The Astronomical Journal*. **129** (3): 1483–1522. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0412070](https://arxiv.org/abs/astro-ph/0412070). [Bibcode](/source/Bibcode_(identifier)):[2005AJ....129.1483L](https://ui.adsabs.harvard.edu/abs/2005AJ....129.1483L). [doi](/source/Doi_(identifier)):[10.1086/427854](https://doi.org/10.1086%2F427854). [S2CID](/source/S2CID_(identifier)) [2603568](https://api.semanticscholar.org/CorpusID:2603568).

1. **[^](#cite_ref-Sato2008_12-0)** Sato, Bun'ei; et al. (2008). "Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD167042". *Publications of the Astronomical Society of Japan*. **60** (6): 1317–1326. [arXiv](/source/ArXiv_(identifier)):[0807.0268](https://arxiv.org/abs/0807.0268). [Bibcode](/source/Bibcode_(identifier)):[2008PASJ...60.1317S](https://ui.adsabs.harvard.edu/abs/2008PASJ...60.1317S). [doi](/source/Doi_(identifier)):[10.1093/pasj/60.6.1317](https://doi.org/10.1093%2Fpasj%2F60.6.1317). [S2CID](/source/S2CID_(identifier)) [67841762](https://api.semanticscholar.org/CorpusID:67841762).

1. ^ [***a***](#cite_ref-Teng2023_13-0) [***b***](#cite_ref-Teng2023_13-1) Teng, Huan-Yu; Sato, Bun'ei; et al. (December 2023). "Revisiting planetary systems in the Okayama Planet Search Program: A new long-period planet, RV astrometry joint analysis, and a multiplicity-metallicity trend around evolved stars". *[Publications of the Astronomical Society of Japan](/source/Publications_of_the_Astronomical_Society_of_Japan)*. **75** (6): 1030–1071. [arXiv](/source/ArXiv_(identifier)):[2308.05343](https://arxiv.org/abs/2308.05343). [Bibcode](/source/Bibcode_(identifier)):[2023PASJ...75.1030T](https://ui.adsabs.harvard.edu/abs/2023PASJ...75.1030T). [doi](/source/Doi_(identifier)):[10.1093/pasj/psad056](https://doi.org/10.1093%2Fpasj%2Fpsad056).

## External links

- ["Notes for star HD 167042"](https://web.archive.org/web/20071106054820/http://exoplanet.eu/star.php?st=HD+167042). *[Extrasolar Planets Encyclopaedia](/source/Extrasolar_Planets_Encyclopaedia)*. Archived from [the original](http://exoplanet.eu/star.php?st=HD+167042) on November 6, 2007. Retrieved 2008-08-24.

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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Adapted from the Wikipedia article [HD 167042](https://en.wikipedia.org/wiki/HD_167042) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_167042?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.