72 Ophiuchi

light-years
Proper names: 72 Ophiuchi
Catalog numbers:
     Woolley (Wo) 9615, Henry Draper (HD) 165777, Bonner Durchmusterung (BD) +9°3564, Hipparcos Input Catalog (HIC) 88771, Smithsonian Astrophysical Observatory (SAO) 123142, Aitken Double Star (ADS) 11076, Fifth Fundamental Catalogue (FK5) 680, Hoffleit Bright Star (HR) 6771, O. Struve (STT) 342 , BDS 8359
Arity: binary
Right Ascension and Declination: 18h7m20.988s, +9°33'49.87" (epoch 2000.0)
Distance from Sol: 82.8 light-years (25.4 parsecs)
Standard error in distance: 2.0631%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 2.62, -81.6, 13.8
Galactic (X,Y,Z) coordinates in ly: 64.4, 48.3, 19.4
Proper motion: 0.102 arcsec/yr (322.4° from north)
Radial Velocity: -23.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -23.9, -11.1, 5.08

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +1.71
Combined visual luminosity: 18.1 x Sol
Observed Separation: 645 A.U.s
Year of separation observation: 1934
As seen from A:
     B would appear as magnitude -5.55
As seen from B:
     A would appear as magnitude -15.82


Component A:
Spectral class: A4
Luminosity Class: V
Apparent visual magnitude: +3.73
Absolute visual magnitude: +1.71
Visual luminosity: 18.1 x Sol
Color indices: B-V= +0.12, U-B= +0.10
Diameter: 2.73 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 4.25 A.U.s
Angular size of star in sky in CZ: 0.342052 degrees


Component B:
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +14.00
Absolute visual magnitude: +11.98
Visual luminosity: 0.0014 x Sol
Color indices: R-I= +0.40
Diameter: 0.34 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.038 A.U.s
Angular size of star in sky in CZ: 4.829064 degrees

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