HD 99706
HD 99706 is a subgiant star 480 light-years away, belonging to spectral class K0. Its age is younger than the Sun's at 2.8±0.2 billion years. The star is slightly enriched in heavy elements, having 110% of solar abundance.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 11h 28m 30.2137s[1] |
| Declination | +43° 57′ 59.6854″[1] |
| Apparent magnitude (V) | 7.65[2] |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | K0IV |
| B−V color index | 1.0[3] |
| Astrometry | |
| Radial velocity (Rv) | −30.07[1] km/s |
| Proper motion (μ) | RA: 45.406[1] mas/yr Dec.: −87.500[1] mas/yr |
| Parallax (π) | 6.7929 ± 0.0518[1] mas |
| Distance | 480 ± 4 ly (147 ± 1 pc) |
| Details[2] | |
| Mass | 1.46 M☉ |
| Radius | 5.52 R☉ |
| Luminosity | 13.1±0.1[4] L☉ |
| Surface gravity (log g) | 3.09 cgs |
| Temperature | 4862 K |
| Metallicity [Fe/H] | 0.05[5] dex |
| Rotational velocity (v sin i) | 1.8±0.6[5] km/s |
| Age | 2.8±0.2 [4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The imaging survey in 2016 has failed to find any stellar companions to HD 99706.[7]
Planetary system
In 2011 one superjovian planet, HD 99706 b, on a mildly eccentric orbit around star HD 99706 was discovered utilizing the radial velocity method.[3] Another superjovian planet on outer orbit was detected in 2016.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| HD 99706 b | >1.23 MJ | 1.98 | 841 | 0.25 | — | 1.244 RJ |
| HD 99706 c | >5.69+1.43 −0.96 MJ |
— | 1278+151 −198 |
0.411+0.231 −0.178 |
— | — |
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Luhn, Jacob K.; Bastien, Fabienne A.; Wright, Jason T.; Johnson, John A.; Howard, Andrew W.; Isaacson, Howard (2018), "Retired A Stars and Their Companions VIII: 15 New Planetary Signals Around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts", The Astronomical Journal, 157 (4): 149, arXiv:1811.03043, Bibcode:2019AJ....157..149L, doi:10.3847/1538-3881/aaf5d0, S2CID 102486961
- John Asher Johnson; Clanton, Christian; Howard, Andrew W.; Bowler, Brendan P.; Henry, Gregory W.; Marcy, Geoffrey W.; Crepp, Justin R.; Endl, Michael; Cochran, William D.; MacQueen, Phillip J.; Wright, Jason T.; Isaacson, Howard (2011), "Retired a Stars and Their Companions. Vii. 18 New Jovian Planets", The Astrophysical Journal Supplement Series, 197 (2): 26, arXiv:1108.4205, Bibcode:2011ApJS..197...26J, doi:10.1088/0067-0049/197/2/26, S2CID 15088371
- Bonfanti, A.; Ortolani, S.; Piotto, G.; Nascimbeni, V. (2015), "Revising the ages of planet-hosting stars", Astronomy & Astrophysics, 575: A18, arXiv:1411.4302, Bibcode:2015A&A...575A..18B, doi:10.1051/0004-6361/201424951, S2CID 54555839
- Ghezzi, Luan; Montet, Benjamin T.; Johnson, John Asher (2018), "Retired a Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass", The Astrophysical Journal, 860 (2): 109, arXiv:1804.09082, Bibcode:2018ApJ...860..109G, doi:10.3847/1538-4357/aac37c, S2CID 118969017
- "HD 99706". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 October 2020.
- Ginski, C.; Mugrauer, M.; Seeliger, M.; Buder, S.; Errmann, R.; Avenhaus, H.; Mouillet, D.; Maire, A.-L.; Raetz, S. (2016), "A lucky imaging multiplicity study of exoplanet host stars II", Monthly Notices of the Royal Astronomical Society, 457 (2): 2173–2191, arXiv:1601.01524, Bibcode:2016MNRAS.457.2173G, doi:10.1093/mnras/stw049, S2CID 53626523
- Bryan, Marta L.; Knutson, Heather A.; Howard, Andrew W.; Ngo, Henry; Batygin, Konstantin; Crepp, Justin R.; Fulton, B. J.; Hinkley, Sasha; Isaacson, Howard; Johnson, John A.; Marcy, Geoffry W.; Wright, Jason T. (2016), "Statistics of Long Period Gas Giant Planets in Known Planetary Systems", The Astrophysical Journal, 821 (2): 89, arXiv:1601.07595, Bibcode:2016ApJ...821...89B, doi:10.3847/0004-637X/821/2/89, S2CID 19709252
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