4 Ursae Majoris

Database links to 4 Ursae Majoris

Star 4 Ursae Majoris
AladinLite
Observation dates equinox :  J2000.0 , epoch : J2000.0
Constellation	Big Bear
Right ascension	08 h 40 m 12.82 s
declination	+ 64 ° 19 ′ 40.6 ″
Apparent brightness	4.60 mag
Typing
Known exoplanets	1
B − V color index	1.17
U − B color index	1.16
R − I index	0.63
Spectral class	K1 III
Astrometry
Radial velocity	(14.62 ± 0.19) km / s
parallax	(12.74 ± 0.26)  mas
distance	(256 ± 5)  ly (78.5 ± 1.6)  pc
Proper movement
Rec. Share:	(−59.42 ± 0.57)  mas / a
Dec. portion:	(+26.44 ± 0.48)  mas / a
Physical Properties
Dimensions	1.2  M ☉
Effective temperature	4415  K
Metallicity [Fe / H]	−0.25
Age	4.6 billion  a
Other names and catalog entries
Bayer name π 2  Ursae Majoris Flamsteed name 4 Ursae Majoris Bonn survey BD + 64 ° 698 Bright Star Catalog HR 3403 [1] Henry Draper Catalog HD 73108 [2] Hipparcos catalog HIP 42527 [3] SAO catalog SAO 14616 [4] Tycho catalog TYC 4130-2355-1 [5]

4 Ursae Majoris , also known as π ² Ursae Majoris (Pi ² Ursae Majoris), is a giant star located about 250 light-years from Earth in the constellation Great Bear . It has an apparent magnitude of 4.6 mag. In 2007 Doellinger discovered an extrasolar planet orbiting this star. This is called 4 Ursae Majoris b .

Exoplanet (4 Ursae Majoris b)

4 Ursae Majoris b is the exoplanet candidate that orbits the giant star every 269.3 days . The planet orbits 4 Ursae Majoris at a distance of approximately 0.87 astronomical units and has a mass of at least 7.1 the masses of Jupiter. The discovery of the potential exoplanet using the radial velocity method was made in 2007 by Doellinger et al. published.

Web links

• SIMBAD
• Encyclopedia of Exoplanets
• The exoplanet in the "Encyclopedia of Extrasolar Planets"

Individual evidence

1. ↑ ^{a b} Hipparcos catalog
2. ↑ ^{a b c} SIMBAD database
3. ↑ ^{a b c} Bright Star Catalog