HD 1690
HD 1690 is a single orange (K-type) giant star, located approximately 2500 light-years away in the constellation of Cetus, taking its primary name from its Henry Draper Catalogue designation.
Location of HD 1690 in the night sky. The star is marked within the red diamond. | |
| 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 |
| Distance | 2,510 ± 90 ly (770 ± 30 pc) |
| Details | |
| HD 1690 | |
| Mass | 1.18±0.23[2] M☉ |
| Radius | 16.7[3] R☉ |
| Surface gravity (log g) | 2.12±0.17[2] cgs |
| Temperature | 4393±85 K |
| Metallicity [Fe/H] | -0.32±0.06 dex |
| Rotational velocity (v sin i) | 1.86±0.07 km/s |
| Age | 6.7±3.2[4] Gyr |
| Other designations | |
BD-09 54, HIP 1692, TYC 5262-825-1, 2MASS J00211332-0816521, Gaia DR2 2430036837596487424 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
History and nomenclature
The designation HD 1690 is from the Henry Draper Catalogue, which is based on spectral classifications made between 1911 and 1915 by Annie Jump Cannon and her co-workers, and was published between 1918 and 1924.
Characteristics
HD 1690 is an evolved K-type giant star. It is likely older than the Sun and have metallicity of 30% to solar.[2] The Hipparcos parallax data have resulted in a distance determination of just 1,012 light years,[5] but Gaia data have placed HD 1690 much farther from Sun at 2,500 light years.[6]
Planetary system
In 2010, a radial-velocity analysis carried out by a team of astronomers led by astronomer C. Moutou of the High Accuracy Radial Velocity Planet Searcher have detected a super-Jovian giant planet in orbit around HD 1690.[4]
The planet b is orbiting a very eccentric orbit, and other gas giant planets in the system are unlikely unless located on unstable crossing orbits.[7]
| 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 | — | — |
See also
- List of extrasolar planets
References
- HD 1690, entry, SIMBAD. Accessed online June 22, 2020.
- New and updated stellar parameters for 71 evolved planet hosts. On the metallicity - giant planet connection, arXiv:1307.7870
- Quantization of Planetary Systems and its Dependency on Stellar Rotation, arXiv:1103.1199
- The HARPS search for southern extra-solar planets: XXVI: Seven new planetary systems, arXiv:1012.3830
- 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.
- GaiaSource-2429846549069734784-2430330987021111936.csv line 6978
- Forever alone? Testing single eccentric planetary systems for multiple companions, arXiv:1307.0894
- Planet HD 1690 b on exoplanet.eu
