HD 1690

HD 1690
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cetus
Right ascension 00h 21m 13.327s[1]
Declination −08° 16′ 52.16″[1]
Apparent magnitude (V) 9.19[2]
Characteristics
Evolutionary stage Giant
Spectral type K1 III[3]
B−V color index 1.354±0.045[2]
Astrometry
Radial velocity (Rv)+18.216±0.011[4] km/s
Proper motion (μ) RA: 13.285 mas/yr[1]
Dec.: 2.919 mas/yr[1]
Parallax (π)1.2679 ± 0.0273 mas[1]
Distance2,570 ± 60 ly
(790 ± 20 pc)
Details
Mass1.18±0.23[5] M☉
Radius16.7[6] R☉
Surface gravity (log g)2.12±0.17[5] cgs
Temperature4,393±85 K
Metallicity [Fe/H]−0.32±0.06 dex
Rotational velocity (v sin i)1.86±0.07 km/s
Age6.7±3.2[7] Gyr
Other designations
BD−09 54, Gaia DR2 2430036837596487424, HD 1690, HIP 1692, TYC 5262-825-1, 2MASS J00211332-0816521[8]
Database references
SIMBADdata
Exoplanet Archivedata

HD 1690 is a giant star with an orbiting exoplanet companion in the constellation of Cetus. It has an apparent visual magnitude of 9.19,[2] which is too faint to be visible to the naked eye. The distance to this system is approximately 2,570 light years, and it is drifting further away with a radial velocity of +18.2 km/s.[4] HD 1690 has no known companion star, making it a single star system.[9]

This is an evolved K-type giant star with a stellar classification of K1 III.[3] It has 1.18 times the mass of the Sun and, at the estimated age of 6.7 billion years (two billion years older than the Sun), it has expanded to 16 times the Sun's radius. The surface metallicity of HD 1690 (the abundance of elements more massive than helium) is 30% that of the sun.[5] The Hipparcos parallax data have resulted in a distance determination of just 1,012 light years,[10] but more recent data from Gaia data have placed HD 1690 much farther from the Sun at 2,500 light years.[11]

  1. ^ a b c d 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.
  2. ^ a b c 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. ^ a b Gray, R. O.; et al. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048–2059. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. S2CID 119417105.
  4. ^ a b Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
  5. ^ a b c Mortier, A.; Santos, N. C.; Sousa, S. G.; Adibekyan, V. Zh.; Delgado Mena, E.; Tsantaki, M/; Israelian, G.; Mayor, M. (2013). "New and updated stellar parameters for 71 evolved planet hosts. On the metallicity - giant planet connection". Astronomy and Astrophysics. 557 (A70): A70. arXiv:1307.7870. Bibcode:2013A&A...557A..70M. doi:10.1051/0004-6361/201321641. S2CID 55027519.
  6. ^ Zoghbi, J. A. (2011). "Quantization of Planetary Systems and its Dependency on Stellar Rotation". Publications of the Astronomical Society of Australia. 28 (3): 177–201. arXiv:1103.1199. Bibcode:2011PASA...28..177Z. doi:10.1071/AS09062. S2CID 118417966.
  7. ^ Cite error: The named reference Moutou2010 was invoked but never defined (see the help page).
  8. ^ HD 1690, entry, SIMBAD. Accessed online June 22, 2020.
  9. ^ Cite error: The named reference alone was invoked but never defined (see the help page).
  10. ^ 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. S2CID 18759600.
  11. ^ GaiaSource-2429846549069734784-2430330987021111936.csv line 6978