HD 1690

HD 1690 is a 9th magnitude orange giant star located approximately 2,500 light-years away in the constellation of Cetus. It is a single star, and is the host star to one known extrasolar planet.

HD 1690

Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cetus
Right ascension  00h 21m 13.3272s[1]
Declination −08° 16′ 52.1674″[1]
Apparent magnitude (V) 9.178[1]
Characteristics
HD 1690
Evolutionary stage giant star
Spectral type K1III
U−B color index 1.452
B−V color index 1.337
Astrometry
Radial velocity (Rv)+18.216±0.011[1] km/s
Proper motion (μ) RA: 13.467[1] mas/yr
Dec.: 3.103[1] mas/yr
Parallax (π)1.2998 ± 0.0489[1] mas
Distance2,510 ± 90 ly
(770 ± 30 pc)
Details
HD 1690
Mass1.18±0.23[2] M☉
Radius16.7[3] R☉
Surface gravity (log g)2.12±0.17[2] cgs
Temperature4393±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[4] Gyr
Other designations
BD-09 54, HIP 1692, TYC 5262-825-1, 2MASS J00211332-0816521, Gaia DR2 2430036837596487424
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

Characteristics

HD 1690 is an evolved K-type giant star. Its age is estimated at 6.7 billion years (two billion years older than the Sun) and its radius is given at 16.7 solar radii. Its metallicity is 30% that of the sun.[2] The Hipparcos parallax data have resulted in a distance determination of just 1,012 light years,[5] but more recent data from Gaia data have placed HD 1690 much farther from the Sun at 2,500 light years.[6] Despite being an orange giant, its distance gives it an apparent magnitude of 9.178, too faint to be visible to the naked eye or with binoculars. HD 1690 has no known companion star, making it a single star system.[7]

Planetary system

In 2010, a team of astronomers led by astronomer C. Moutou of the High Accuracy Radial Velocity Planet Searcher performed a radial-velocity analysis that detected a gas giant planet in orbit around HD 1690.[4]

The planet HD 1690 b has a very eccentric (far from circular) orbit; its orbital eccentricity is 0.64. This eccentricity suggests that its mass is at least six times that of Jupiter, classifying it as a super-Jupiter.[4] Other planets in the HD 1690 system are unlikely unless they are located on unstable crossing orbital paths.[7]

The HD 1690 planetary system[8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >6.9±0.9 MJ 1.3±0.02 533±1.7 0.64±0.04 — —
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References
  1. HD 1690, entry, SIMBAD. Accessed online June 22, 2020.
  2. 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). arXiv:1307.7870. doi:10.1051/0004-6361/201321641.
  3. Zoghbi, J. A. (2011). "Quantization of Planetary Systems and its Dependency on Stellar Rotation". Publications of the Astronomical Society of Australia. 28 (3). arXiv:1103.1199. doi:10.1071/AS09062.
  4. Moutou, C.; Mayor, M.; Lo Curto, G.; Ségransan, D.; Udry, S.; Bouchy, F.; Benz, W.; Lovis, C.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Sousa, S. G. (2011). "The HARPS search for southern extra-solar planets: XXVI: Seven new planetary systems". Astronomy and Astrophysics. 527 (A63). arXiv:1012.3830. doi:10.1051/0004-6361/201015371.
  5. 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.
  6. GaiaSource-2429846549069734784-2430330987021111936.csv line 6978
  7. Wittenmyer, R. A.; Wang, S.; Horner, J.; Tinney, C. G.; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Bailey, J.; Carter, B. D.; Salter, G. S.; Wright, D.; Zhou, J. (2013). "Forever alone? Testing single eccentric planetary systems for multiple companions". The Astrophysical Journal Supplement Series. 208 (1). arXiv:1307.0894. doi:10.1088/0067-0049/208/1/2.
  8. Planet HD 1690 b on exoplanet.eu

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