What do all these fields mean?
Data for A and B's orbit around one other:
Combined absolute visual magnitude: +0.16
Combined visual luminosity: 74.8 x Sol
Observed Separation: 675 A.U.s
Source for orbit data: Burnham's Celestial Handbook
As seen from A:
B would appear as magnitude -14.46
As seen from B:
A would appear as magnitude -17.18
Component A:
Proper names: Alpha(2) Canum Venaticorum
Catalog numbers:
Henry Draper (HD) 112413, Hoffleit Bright Star (HR) 4915, Smithsonian Astrophysical Observatory (SAO) 63257, Fifth Fundamental Catalogue (FK5) 485, Hipparcos Input Catalog (HIC) 63125, Luyten Two-Tenth (LTT) 13717, Caltech 2-microns Survey (IRC) +40239
Right Ascension and Declination: 12h56m1.664s, +38°19'6.21" (epoch 2000.0)
Celestial (X,Y,Z) coordinates in ly: -83.7, -20.9, 68.2
Galactic (X,Y,Z) coordinates in ly: -9.12, 18.9, 108
Proper motion: 0.2318 arcsec/yr (289.1° from north)
Radial Velocity: -3.3 km/sec
Source for proper motion: Catalogue of Components of Double and Multiple stars
Source for radial velocity: Evans 1978
Galactic (U,V,W) velocity components in km/s: -35.5, -10.2, -4.58
Spectral class: A0p
Apparent visual magnitude: +2.89 (increasing to +2.84)
Absolute visual magnitude: +0.25 (increasing to +0.20)
Visual luminosity: 69.2 x Sol (increasing to 72.4 x Sol)
Variable type: Alpha(2) Canum Venaticorum (rotating variable)
Period of variability: 5.46939 days
Color indices: B-V= -0.12
Comfort Zone (visual): 8.32 A.U.s
Component B:
Proper names: Alpha(1) Canum Venaticorum
Catalog numbers:
Henry Draper (HD) 112412, Hoffleit Bright Star (HR) 4914, Smithsonian Astrophysical Observatory (SAO) 63256, Hipparcos Input Catalog (HIC) 63121, Luyten Two-Tenth (LTT) 13718
Right Ascension and Declination: 12h56m0.49s, +38°18'54.2" (epoch 2000.0)
Celestial (X,Y,Z) coordinates in ly: -83.7, -20.9, 68.2
Galactic (X,Y,Z) coordinates in ly: -9.12, 18.9, 108
Proper motion: 0.2406 arcsec/yr (283.5° from north)
Radial Velocity: -3.1 km/sec
Source for proper motion: Catalogue of Components of Double and Multiple stars
Source for radial velocity: Evans 1978
Galactic (U,V,W) velocity components in km/s: -35.8, -14.0, -3.73
Spectral class: F0
Luminosity Class: V
Apparent visual magnitude: +5.61
Absolute visual magnitude: +2.97
Visual luminosity: 5.66 x Sol
Color indices: B-V= +0.34
Comfort Zone (visual): 2.38 A.U.s