Theta Boötis

light-years
Proper names: Theta Boötis, 23 Boötis, Theta Bootis, 23 Bootis
Catalog numbers:
     Gliese (Gl) 549, Henry Draper (HD) 126660, Bonner Durchmusterung (BD) +52°1804, Hipparcos Input Catalog (HIC) 70497, Smithsonian Astrophysical Observatory (SAO) 29137, Fifth Fundamental Catalogue (FK5) 531, Hoffleit Bright Star (HR) 5404, New Suspected Variable (NSV) 6669
Age: 400 million years
Source for age: Don C. Barry, "Chromospheric Age Dependence of…", APJ 334
Arity: binary
Right Ascension and Declination: 14h25m11.792s, +51°51'2.77" (epoch 2000.0)
Distance from Sol: 47.52 light-years (14.57 parsecs)
Standard error in distance: 0.8094%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -23.66, -17.38, 37.37
Galactic (X,Y,Z) coordinates in ly: -1.313, 24.00, 41.00
Proper motion: 0.468 arcsec/yr (211.2° from north)
Radial Velocity: -11.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 9.873, -32.27, 5.993

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +3.23
Combined visual luminosity: 4.433 x Sol
Observed Separation: 1064 A.U.s
As seen from A:
     B would appear as magnitude -5.76
As seen from B:
     A would appear as magnitude -13.20


Component A:
Spectral class: F7
Luminosity Class: V
Apparent visual magnitude: +4.05
Absolute visual magnitude: +3.23
Visual luminosity: 4.428 x Sol
Color indices: B-V= +0.50, U-B= +0.01, R-I= +0.16
Diameter: 1.738 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 2.104 A.U.s
Angular size of star in sky in CZ: 0.440383 degrees


Component B:
Catalog numbers:
     Giclas (G) 200-37, Luyten Half-Second (LHS) 6
Right Ascension and Declination: 14h23m29s, +52°3'42" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -23.68, -17.12, 37.48
Galactic (X,Y,Z) coordinates in ly: -1.590, 23.95, 41.02
Proper motion: 0.471 arcsec/yr (210.8° from north)
Radial Velocity: -11.3 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 10.03, -32.36, 6.194
Spectral class: M3
Luminosity Class: V
Apparent visual magnitude: +11.50
Absolute visual magnitude: +10.68
Visual luminosity: 0.00464 x Sol
Color indices: B-V= +1.50, R-I= +1.02
Diameter: 0.57 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0681 A.U.s
Angular size of star in sky in CZ: 4.459268 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 4-April-2001.