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    16 Cygni (binary star with planet)

    16 Cygni
    The two stars of 16 Cygni
    A binary star system in the constellation Cygnus, one component of which (16 Cygni B) has been found to have a planet (16 Cygni B b) with a mass about 1½ times that of Jupiter in a highly elongated orbit. Its distance from the primary varies between less than the Venus-Sun distance and more than the Mars-Sun distance.

    The two stars in the 16 Cyg system form a visual binary and are separated by about 700 AU with an orbital period of at least 18,000 years. 16 Cyg A is very similar to the Sun; 16 Cyg B is slightly smaller and dimmer.


    Stars: 16 Cyg A and 16 Cyg B
    distance 69.8 light-years (21.42 parsecs)
    spectral type G1.5V (A); G2.5V (B)
    apparent magnitude 5.96 (A); 6.20 (B)
    metallicity 0.09 (B)
    mass 1.01 Msun (B)
    position R.A. 19h 41m 48.9s, Dec. 50° 31' 30.2" (A)
    R.A. 19h 41m 52.0s, Dec. 50° 31' 3.1" (B)
    other designations Gl 765.1A, BD +50 2847, HD 186408, HIP 96895 (A)
    Gl 765.1B, BD +50 2848, HD 186427, HIP 96901 (B)


    Planet: 16 Cyg B b
    mass (Jupiter=1) 1.68
    semimajor axis 1.67 AU (251 million km, 155 million miles)
    orbital period 798.9 days
    eccentricity 0.67
    discovery 1997, Marcy et al, California Carnegie Planet Search
    method of discovery radial velocity


    orbit of 16Cygni B
    Orbit of 16 Cyg B b around 16 Cyg B (HD 186427)





    References
    1. Cochran W., Hatzes A., Butler P., and Marcy G. "The discovery of a planetary companion to 16 Cyg B," Astrophysical Journal, 483, 457 (1997).
    2. Hauser, H., and Marcy, G. "The Orbit of 16 Cygni AB," Publications of the Astronomical Society of the Pacific, 111, 321 (1999).
    3. Laws C., and Gonzalez, G. "A Differential Spectroscopic Analysis of 16 Cygni A and B," Astrophysical Journal, 553, 405 (2001).

    Related categories

       • EXTRASOLAR PLANETS AND SUBSTELLAR OBJECTS
       • NOTABLE STARS





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