47 Ursae Majoris
Proper names: 47 Ursae Majoris
Catalog numbers:
Gliese (Gl) 407, Henry Draper (HD) 95128, Bonner Durchmusterung (BD) +41°2147, Hipparcos Input Catalog (HIC) 53721, Smithsonian Astrophysical Observatory (SAO) 43557, Fifth Fundamental Catalogue (FK5) 1282, Hoffleit Bright Star (HR) 4277
Age: 6900 million years
Source for age: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Heavy element abundance: 115% of Sol
Source for heavy element abundance: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Arity: singular
Points of interest:
This star has at least one planet, discovered some time in late 1995 or early 1996. The planet has at least 2.4 times the mass of Jupiter and follows an almost-circular path around the star at a distance of 315 million kilometers (2.1 AU) with an orbital period of 1082 days (2.98 years). Assuming it was as reflective as Jupiter is, this planet would have an effective temperature of about 180 K (-135 degrees Fahrenheit).
The star itself has a rotation period of 16 days.
Right Ascension and Declination: 10h59m27.972s, +40°25'48.98" (epoch 2000.0)
Distance from Sol: 45.91 light-years (14.08 parsecs)
Standard error in distance: 0.9205%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -33.74, 9.124, 29.78
Galactic (X,Y,Z) coordinates in ly: -20.09, 1.436, 41.25
Proper motion: 0.324 arcsec/yr (279.2° from north)
Radial Velocity: 11.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -24.34, -2.882, 1.151
What do all these fields mean?
Spectral class: G0
Luminosity Class: V
Apparent visual magnitude: +5.03
Absolute visual magnitude: +4.29
Visual luminosity: 1.679 x Sol
Color indices: B-V= +0.61, U-B= +0.13
Mass: 1.15 x Sol
Diameter: 1.256 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.296 A.U.s
Orbital period in CZ: 1.37532 years
Tidal index in CZ: 0.528678
Angular size of star in sky in CZ: 0.516649 degrees
Detected companions: 2
Companion b:
Mass: 2.39 x Jupiter, minimum
Source for mass: Marcy & Butler
Period: 2.980 years
Standard Error in period: 0.665%
Semimajor Axis: 2.11 A.U.s
Eccentricity: 0.096
Periastron distance: 1.90744 A.U.s
Apastron distance: 2.31256 A.U.s
Source for orbit data: Marcy & Butler
Companion c:
Mass: 0.76 x Jupiter, minimum
Source for mass: Extrasolar Planets encyclopedia
Period: 7.10 years
Standard Error in period: 3.5%
Semimajor Axis: 3.73 A.U.s
Eccentricity: 0.1
Periastron distance: 3.357 A.U.s
Apastron distance: 4.103 A.U.s
Source for orbit data: Extrasolar Planets Encyclopedia
Data for this star system were most recently updated on 8-March-2004.