4 Ursae Majoris b

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4 Ursae Majoris b
Exoplanet List of exoplanets
Parent star
Star 4 Ursae Majoris
Constellation Ursa Major
Right ascension (α) 08h 40m 12.818s[1]
Declination (δ) +64° 19′ 40.57″[1]
Distance 256 ± 5[1] ly
(78 ± 2[1] pc)
Spectral type K1+IIIb
Orbital elements
Semi-major axis (a) 0.87 ± 0.04 AU
Eccentricity (e) 0.432 ± 0.024
Orbital period (P) 269.3 ± 1.96 d
Argument of
periastron
(ω) 23.81 ± 4.42°
Time of periastron (T0) 2,452,987.3936 ± 4.31 JD
Semi-amplitude (K) 215.6 ± 7.1 m/s
Physical characteristics
Minimum mass (m sin i) 7.1 ± 1.6 MJ
Discovery information
Discovery date 28 March 2007
Discoverer(s) Doellinger et al.
Discovery method Doppler Spectroscopy
Discovery status Published

4 Ursae Majoris b (sometimes abbreviated 4 Uma b) is an extrasolar planet orbiting the star 4 Ursae Majoris, approximately 252 light-years away in the constellation of Ursa Major. This planet has a minimum mass over 7 times that of Jupiter and orbits at 0.87 AU from the star in an eccentric path.[2]

References[edit]

  1. ^ a b c d van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ Döllinger, M. P.; et al. (2007). "Discovery of a planet around the K giant star 4 Ursae Majoris". Astronomy and Astrophysics. 472 (2): 649–652. arXiv:astro-ph/0703672Freely accessible. Bibcode:2007A&A...472..649D. doi:10.1051/0004-6361:20066987. 

External links[edit]

Coordinates: Sky map 08h 40m 12.8s, +64° 19′ 40″