HIP 57274
HIP 57274 is a K-type main-sequence star in the constellation Ursa Major. It has an apparent magnitude of 8.96 and is both smaller and less luminous than the sun. Three planets orbit it.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 11h 44m 40.9643s[1] |
| Declination | +30° 57′ 33.4509″[1] |
| Apparent magnitude (V) | 8.96[2] |
| Characteristics | |
| Spectral type | K5 V[2] |
| U−B color index | +1.06[3] |
| B−V color index | +1.13[3] |
| Astrometry | |
| Radial velocity (Rv) | 29.70 ± 0.24[4] km/s |
| Proper motion (μ) | RA: −27.069±0.081[1] mas/yr Dec.: −381.708±0.079[1] mas/yr |
| Parallax (π) | 38.6381 ± 0.0499[1] mas |
| Distance | 84.4 ± 0.1 ly (25.88 ± 0.03 pc) |
| Absolute magnitude (MV) | 6.89[2] |
| Details[2] | |
| Mass | 0.73 ± 0.05 M☉ |
| Radius | 0.68 ± 0.03 R☉ |
| Luminosity | 0.19 ± 0.01 L☉ |
| Surface gravity (log g) | 4.71 ± 0.1 cgs |
| Metallicity [Fe/H] | +0.09 ± 0.05 dex |
| Rotation | 45 d |
| Rotational velocity (v sin i) | 0.5 ± 0.5 km/s |
| Age | 7.87 ± 5 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Planetary system
The three planets orbiting HIP 57274 were discovered by radial velocity method in 2011.[2] The planetary orbits are possibly highly variable, being strongly affected by mean motion resonances.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥11.6±1.3 M⊕ | 0.0713±0.00163 | 8.1352±0.004 | 0.187±0.10 | — | — |
| c | ≥130±3 M⊕ | 0.1778±0.0041 | 32.03±0.02 | 0.05±0.02 | — | — |
| d | ≥167.4±8 M⊕ | 1.007±0.027 | 431.7±8.5 | 0.27±0.05 | — | — |
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.
- Fischer, Debra A.; et al. (2012). "M2K. II. A Triple-planet System Orbiting HIP 57274". The Astrophysical Journal. 745 (1). 21. arXiv:1109.2926. Bibcode:2012ApJ...745...21F. doi:10.1088/0004-637X/745/1/21.
- Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- "BD+31 2290". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 August 2017.
- Elser, S.; Grimm, S. L.; Stadel, J. G. (2013), "Super Earths and Dynamical Stability of Planetary Systems: First Parallel GPU Simulations Using GENGA", Monthly Notices of the Royal Astronomical Society, 433 (3): 2194–2205, arXiv:1305.4070, doi:10.1093/mnras/stt883
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