HIP 57274

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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
BD+31° 2290, GJ 439, HIP 57274, SAO 62684, LTT 13227[4]
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[edit]

  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d 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:1109.2926Freely accessible. Bibcode:2012ApJ...745...21F. doi:10.1088/0004-637X/745/1/21. 
  3. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode:1986EgUBV........0M. 
  4. ^ a b c "BD+31 2290". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 August 2017.