4 Ursae Majoris
Star 4 Ursae Majoris |
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AladinLite | |||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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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 |
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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 |
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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
- ↑ a b Hipparcos catalog
- ↑ a b c SIMBAD database
- ↑ a b c Bright Star Catalog