4 Ursae Majoris b

4 Ursae Majoris b

Extrasolar planet		List of extrasolar planets
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.
Detection 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 a eccentric path.

References

• Döllinger et al.; Hatzes, A. P.; Pasquini, L.; Guenther, E. W.; Hartmann, M.; Girardi, L.; Esposito, M. (2007). "Discovery of a planet around the K giant star 4 Ursae Majoris" (abstract). Astronomy and Astrophysics 472 (2): 649–652. arXiv:astro-ph/0703672. Bibcode 2007A&A...472..649D. doi:10.1051/0004-6361:20066987. http://www.aanda.org/articles/aa/abs/2007/35/aa6987-06/aa6987-06.html.  (web preprint)

External links

• Jean Schneider (2011). "Notes for planet 4 Uma b". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/planet.php?p1=4+Uma&p2=b&showPubli=yes&sortByDate#a_publi. Retrieved 3 October 2011.