4 Ursae Majoris b

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4 Ursae Majoris b
Extrasolar planet List of extrasolar planets
Planet Pi2 UMa b.png
Artist's conception of 4 Ursae Majoris b.
Parent star
Star 4 Ursae Majoris
Constellation Ursa Major
Right ascension (α) 08h 40m 12.8s
Declination (δ) +64° 19′ 40″
Distance 252 ly
(77 pc)
Spectral type K1+IIIb
Orbital elements
Semimajor 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.

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