HD 231701

HD 231701 is a yellow-white hued star in the northern constellation of Sagitta, near the southern constellation border with Aquila. With an apparent visual magnitude of 8.97,[2] it is too dim to be viewed with the naked eye, but can be seen with powerful binoculars or a small telescope. Parallax measurements provide a distance estimate of approximately 356 light years from the Sun, but it is drifting closer with a radial velocity of −63 km/s.[1] It is predicted to come as close as 189.5 light-years in 1.345 million years.[2]

HD 231701
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagitta
Right ascension 19h 32m 04.1610s[1]
Declination +16° 28′ 27.4411″[1]
Apparent magnitude (V) 8.97[2]
Characteristics
Evolutionary stage main sequence
Spectral type F8 V[2]
B−V color index 0.539±0.015[2]
Astrometry
Radial velocity (Rv)−63.36±0.19[1] km/s
Proper motion (μ) RA: 63.363±0.053[1] mas/yr
Dec.: 15.650±0.052[1] mas/yr
Parallax (π)9.1560 ± 0.0393[1] mas
Distance356 ± 2 ly
(109.2 ± 0.5 pc)
Absolute magnitude (MV)3.64[2]
Details
Mass1.23±0.10[3] M☉
Radius1.45+0.01
−0.04[1] R☉
Luminosity2.572±0.016[1] L☉
Surface gravity (log g)4.37±0.03[4] cgs
Temperature6,081+72
−24[1] K
Metallicity [Fe/H]0.04±0.02[5] dex
Rotational velocity (v sin i)4.26[4] km/s
Age3.22±1.99[3] or 4.5[6] Gyr
Other designations
BD+16° 3883, HD 231701, HIP 96078, SAO 104946[7]
Database references
SIMBADdata

HD 231701 is named Uruk. The name was selected in the NameExoWorlds campaign by Iraq, during the 100th anniversary of the IAU. Uruk was an ancient city of the Sumer and Babylonian civilizations in Mesopotamia.[8][9]

This object is an ordinary F-type main-sequence star with a stellar classification of F8 V.[2] It is around three[3] to 4.5 billion years old and may be evolving onto the subgiant branch.[6] It is spinning with a projected rotational velocity of 4 km/s[4] and has low chromospheric activity.[6] HD 231701 has 1.2[3] times the mass of the Sun and 1.45[1] times the Sun's radius. It is radiating 2.6 times the luminosity of the Sun from its photosphere at an effective temperature of 6,081 K.[1]

In 2007, the N2K Consortium used the radial velocity technique to discover a Jupiter-like planet orbiting at a distance of 0.57 AU from the star with a period of 141.6 days.[6]

The HD 231701 planetary system[10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥1.13±0.25 MJ 0.567±0.053 141.63±0.067 0.13±0.032 — —

See also
  • List of extrasolar planets

References
  1. 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.
  2. 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. Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
  4. Delgado Mena, E.; et al. (April 2015), "Li abundances in F stars: planets, rotation, and Galactic evolution", Astronomy & Astrophysics, 576: 24, arXiv:1412.4618, Bibcode:2015A&A...576A..69D, doi:10.1051/0004-6361/201425433, S2CID 56051637, A69.
  5. Santos, N. C.; et al. (2013). "SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs". Astronomy and Astrophysics. 556. A150. arXiv:1307.0354. Bibcode:2013A&A...556A.150S. doi:10.1051/0004-6361/201321286. S2CID 55237847.
  6. Fischer, Debra A.; et al. (2007). "Five Intermediate-Period Planets from the N2K Sample". The Astrophysical Journal. 669 (2): 1336–1344. arXiv:0704.1191. Bibcode:2007ApJ...669.1336F. doi:10.1086/521869. S2CID 7774321.
  7. "HD 231701". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-18.
  8. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  9. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  10. Ment, Kristo; et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5). 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5. S2CID 119243619.

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