Astronomy:HD 231701
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 356 ± 2 ly (109.2 ± 0.5 pc) |
| Absolute magnitude (MV) | 3.64[2] |
| Details | |
| Mass | 1.23±0.10[3] M☉ |
| Radius | 1.45+0.01 −0.04[1] R☉ |
| Luminosity | 2.572±0.016[1] L☉ |
| Surface gravity (log g) | 4.37±0.03[4] cgs |
| Temperature | 6,081+72 −24[1] K |
| Metallicity [Fe/H] | 0.04±0.02[5] dex |
| Rotational velocity (v sin i) | 4.26[4] km/s |
| Age | 3.22±1.99[3] or 4.5[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 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 astronomical unit|AU from the star with a period of 141.6 days.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Babylonia | ≥1.13±0.25 MJ | 0.567±0.053 | 141.63±0.067 | 0.13±0.032 | — | — |
See also
- List of extrasolar planets
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal 153 (1): 19, doi:10.3847/1538-3881/153/1/21, 21, Bibcode: 2017AJ....153...21L.
- ↑ 4.0 4.1 4.2 Delgado Mena, E. et al. (April 2015), "Li abundances in F stars: planets, rotation, and Galactic evolution", Astronomy & Astrophysics 576: 24, doi:10.1051/0004-6361/201425433, A69, Bibcode: 2015A&A...576A..69D.
- ↑ Santos, N. C. et al. (2013). "SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs". Astronomy and Astrophysics 556: A150. doi:10.1051/0004-6361/201321286. Bibcode: 2013A&A...556A.150S. http://www.aanda.org/articles/aa/full_html/2013/08/aa21286-13/aa21286-13.html.
- ↑ 6.0 6.1 6.2 6.3 Fischer, Debra A. et al. (2007). "Five Intermediate-Period Planets from the N2K Sample". The Astrophysical Journal 669 (2): 1336–1344. doi:10.1086/521869. Bibcode: 2007ApJ...669.1336F.
- ↑ "HD 231701". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+231701.
- ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results.
- ↑ "International Astronomical Union | IAU". https://www.iau.org/news/pressreleases/detail/iau1912/.
- ↑ 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. doi:10.3847/1538-3881/aae1f5. Bibcode: 2018AJ....156..213M.
External links
Coordinates: 
19h 32m 04.1611s, +16° 28′ 27.444″
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