HD 90156
HD 90156 is a 7th magnitude G-type main sequence star located approximately 73 light years away[1] in the constellation Hydra. This star is smaller, cooler, fainter, and less massive than our Sun. Also its metal content is over half as much as the Sun. In 2009, a gas giant planet was found in orbit around the star.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 10h 23m 55.275s[1] |
| Declination | –29° 38′ 43.91″[1] |
| Apparent magnitude (V) | 6.947 |
| Characteristics | |
| Spectral type | G5V |
| Apparent magnitude (B) | 7.572 |
| Apparent magnitude (J) | 5.685 |
| Apparent magnitude (H) | 5.382 |
| Apparent magnitude (K) | 5.245 |
| B−V color index | 0.625 |
| Astrometry | |
| Radial velocity (Rv) | 26.4 km/s |
| Proper motion (μ) | RA: –38.02 ± 0.46[1] 6 mas/yr Dec.: 99.61 ± 0.47[1] mas/yr |
| Parallax (π) | 44.74 ± 0.49[1] mas |
| Distance | 72.9 ± 0.8 ly (22.4 ± 0.2 pc) |
| Absolute magnitude (MV) | 5.226 |
| Details | |
| Mass | 0.99 M☉ |
| Radius | 0.87 ± 0.05 R☉ |
| Luminosity | 0.698 ± 0.03 L☉ |
| Temperature | 5670 ± 100 K |
| Metallicity [Fe/H] | –0.24 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
This star was designated as Gamma Antliae by Lacaille, and Gould intended to keep it in that constellation. However, the delineating of constellation boundaries in 1930 saw it transferred to Hydra.[2]
The survey in 2015 have ruled out the existence of any stellar companions at projected distances above 5 astronomical units.[3]
Planetary system
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥17.98 ± 1.46 M⊕ | 0.250 ± 0.004 | 49.77 ± 0.07 | 0.31 ± 0.10 | — | — |
See also
- List of extrasolar planets
References
- 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.Vizier catalog entry
- Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, VA: The McDonald & Woodward Publishing Company. p. 29. ISBN 978-0-939923-78-6.
- Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3). doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
- Mordasini, C.; et al. (2011). "The HARPS search for southern extrasolar planets XXIV. Companions to HD 85390, HD 90156, and HD 103197: a Neptune analog and two intermediate-mass planets". Astronomy and Astrophysics. 526. A111. arXiv:1010.0856. Bibcode:2011A&A...526A.111M. doi:10.1051/0004-6361/200913521.
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