HD 86226
HD 86226 is a G type yellowish white star found in the constellation of Hydra.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 56m 29.84s |
| Declination | –24° 05′ 57.8″ |
| Apparent magnitude (V) | 7.932 |
| Characteristics | |
| Spectral type | G2V |
| Apparent magnitude (B) | 8.563 |
| Apparent magnitude (R) | 7.71 |
| Apparent magnitude (J) | 6.839 |
| Apparent magnitude (H) | 6.577 |
| Apparent magnitude (K) | 6.463 |
| B−V color index | 0.631 |
| V−R color index | 0.22 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | +19.4 km/s |
| Proper motion (μ) | RA: –176.37 mas/yr Dec.: 46.72 mas/yr |
| Parallax (π) | 23.54 ± 0.85 mas |
| Distance | 139 ± 5 ly (42 ± 2 pc) |
| Absolute magnitude (MV) | 4.791 |
| Details | |
| Mass | 1.06 ± 0.03[1] M☉ |
| Radius | 1.02 ± 0.03 R☉ |
| Luminosity | 1.06 L☉ |
| Surface gravity (log g) | 4.36 ± 0.04 cgs |
| Temperature | 5903 ± 31 K |
| Metallicity | 0.05 ± 0.03 |
| Rotation | 23 ± 4 |
| Age | 1.5 ± 1.3 Gyr |
| Other designations | |
CD–23°8866, HIP 48739, PPM 256971, SAO 178205 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
The survey in 2015 have ruled out the existence of any stellar companions at projected distances above 12 astronomical units.[2]
Planetary system
Due to the periodic spectrum shifts when it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star. The object discovered in 2010 had a Keplerian orbit, was declared an exoplanet and dubbed HD 86226 b.[3][4][5][6]
A hot Super-Earth planet HD 86226 c was also discovered in 2020.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | 7.25+1.19 −1.12 M⊕ |
0.049±0.001 | 3.98442±0.00018 | 0.075+0.065 −0.048 |
86.45+0.26 −0.16° |
2.16±0.08 R⊕ |
| b | 0.45+0.04 −0.05 MJ |
2.73±0.06 | 1628+22 −21 |
0.059+0.062 −0.039 |
— | — |
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References
- Marmier, M.; et al. (March 2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639.
- 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.
- "Constellations: Hydra 'the Sea Serpent'". h2g2. Retrieved 2010-02-10.
- Arriagada, Pamela; et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program". The Astrophysical Journal. 711 (2). arXiv:1001.4093. Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229.
- "HD 86226". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-02-10.
- "Star : HD 86226". The Extrasolar Planets Encyclopaedia. Retrieved 2010-02-10.
- TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet, 2020, arXiv:2007.13927
External links
- "HD 86226". SAO/NASA Astrophysics Data System (ADS) (Database query).
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