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    47 Ursae Majoris

    47 Ursae Majoris
    47 UMa system compared with Jupiter's orbit around the Sun. Credit: Kirk Woellert, National Science Foundation
    One of the first Sun-like stars to be found to have a planet.1 This companion, 47 UMa b, was the first planet found orbiting another star to fall into the category of a classical Jovian – that is, one which roughly resembles Jupiter in both its mass and orbit. Its location around its host star is approximately the same as that of the asteroid belt in the solar system. The discovery of a second planet in the 47 UMa system, 47 UMa c, was announced in 2002, although this finding has not been confirmed by other groups.2 47 Uma was one of the five targets of the Cosmic Call initiative on Feb. 14, 2003.


    Host star
    Distance 45.9 light-years (14.1 parsecs)
    Spectral type G1V
    Surface temperature 5,470ºC
    Luminosity (Sun = 1) 1.54
    Mass (Sun = 1) 1.03
    Apparent magnitude 5.03
    Position R.A. 10h 59m 28.0s,
    Dec. +40° 25' 48.9"
    Other designations Gl 407, HR 4277, BD +41°2147, HD 95128, LTT 12934, GCTP 2556.00, SAO 43557, FK5 1282, GC 15087, HIP 53721


    Planets
      b c
    Mass (Jupiter = 1) 2.63 ± 0.23 0.79 ± 0.13
    Semimajor axis 2.13 AU (320 million km, 198 million miles) 3.73 AU (560 million km, 348 million miles)
    Orbital period 1,089 days (2.98 years) 2,594 days (7.10 years)
    Eccentricity 0.061 < 0.12
    Discovery 1996, Butler and Marcy 2002, Fischer, Marcy, et al
    Method of discovery radial velocity radial velocity


    References
    1. Butler, P., and Marcy, G. "A Planet Orbiting 47 UMa," Astrophysical Journal Letters, 464, L153 (1996).
    2. Fischer, D. A., Marcy, G. W., Butler, R. P., Laughlin, G., and Vogt, S. S. "A Second Planet Orbiting 47 Ursae Majoris," ApJ, 564 1028 (2002).

    Related categories

       • NOTABLE STARS
       • EXTRASOLAR PLANETS



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