HD 167042

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HD 167042
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Draco
Right ascension  18h 10m 31.64008s[1]
Declination +54° 17′ 11.5922″[1]
Apparent magnitude (V) +5.97[2]
Spectral type K1 IV[2]
U−B color index +0.716[3]
B−V color index +0.934[3]
Radial velocity (Rv)−17.88[4] km/s
Proper motion (μ) RA: +107.94[1] mas/yr
Dec.: +247.35[1] mas/yr
Parallax (π)19.91 ± 0.26[1] mas
Distance164 ± 2 ly
(50.2 ± 0.7 pc)
Mass1.88±0.07 M
Radius5.70±0.10 R
Luminosity12.47±0.54 L
Surface gravity (log g)3.2±0.1 cgs
Temperature4,547±49 K
Metallicity [Fe/H]−0.1 dex
Rotational velocity (v sin i)0.68[4] km/s
Age1.82±5.23 Gyr
Other designations
BD+54° 1950, GC 24820, HD 167042, HIP 89017, HR 6817, SAO 30784, LTT 15382[5]
Database references

HD 167042 is a 6th magnitude K-type subgiant star located approximately 164 light-years away in Draco constellation. It has mass of 1.88 times that of the Sun and the age is only 1.8 billion years old. When this star was a main sequence, it was white mid to late A-type star based on its mass.

Planetary system[edit]

On 28 November 2007, a preprint of the discovery of the planet HD 167042 b was posted to the arXiv server. The peer reviewed paper was then published in The Astrophysical Journal on 1 March 2008.[6] The discovery was later independently confirmed.[7]

The HD 167042 planetary system[6]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >1.7 MJ 1.30 412.6 ± 4 0.027 ± 0.04

See also[edit]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ a b c 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:1511.03197, Bibcode:2016A&A...586A..94L, doi:10.1051/0004-6361/201527054, A94.
  3. ^ a b Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society, 172: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
  4. ^ a b Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474.
  5. ^ "HD 167042". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.
  6. ^ a b 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:0711.4367. Bibcode:2008ApJ...675..784J. doi:10.1086/526453.
  7. ^ 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:0807.0268. Bibcode:2008PASJ...60.1317S. doi:10.1093/pasj/60.6.1317.

External links[edit]

Coordinates: Sky map 18h 10m 31.6403s, +54° 17′ 11.588″