HIP 57274
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 11h 44m 40.96448s[1] |
Declination | +30° 57′ 33.4552″[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: −26.40[1] mas/yr Dec.: −380.80[1] mas/yr |
Parallax (π) | 38.28 ± 0.25[1] mas |
Distance | 85.2 ± 0.6 ly (26.1 ± 0.2 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 |
HIP 57274 is a star in the constellation Ursa Major. Its apparent magnitude is 8.96. Three planets orbit it.[4]
References
- 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 4 Fischer, Debra A.; Gaidos, Eric; Howard, Andrew W.; Giguere, Matthew J.; Johnson, John A.; Marcy, Geoffrey W.; Wright, Jason T.; Valenti, Jeff A.; Piskunov, Nikolai; Clubb, Kelsey I.; Isaacson, Howard; Apps, Kevin; Lepine, Sebastien; Mann, Andrew; Moriarty, John; Brewer, John; Spronck, Julien F. P.; Schwab, Christian; Szymkowiak, Andrew (2012). "M2K. Ii. A Triple-Planet System Orbiting Hip 57274". The Astrophysical Journal. 745: 21. arXiv:1109.2926. Bibcode:2012ApJ...745...21F. doi:10.1088/0004-637X/745/1/21.
- 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode:1986EgUBV........0M.
- 1 2 3 "BD+31 2290". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 August 2017.
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