V645 Herculis

light-years
Proper names: V645 Herculis
Catalog numbers:
     Gliese (Gl) 669, Hipparcos Input Catalog (HIC) 84794
Arity: binary
Right Ascension and Declination: 17h19m54.232s, +26°30'3.67" (epoch 2000.0)
Distance from Sol: 35.0 light-years (10.7 parsecs)
Standard error in distance: 1.9958%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: -5.45, -30.8, 15.6
Galactic (X,Y,Z) coordinates in ly: 19.7, 22.8, 17.7
Proper motion: 0.43 arcsec/yr (330.0° from north)
Radial Velocity: -33.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -35.5, -18.6, -3.14

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +11.02
Combined visual luminosity: 0.0034 x Sol
Observed Separation: 139 A.U.s
As seen from A:
     B would appear as magnitude -8.03
As seen from B:
     A would appear as magnitude -9.60


Component A:
Catalog numbers:
     Giclas (G) 170-35, Ross 868
Spectral class: M4e
Luminosity Class: V
Apparent visual magnitude: +11.40
Absolute visual magnitude: +11.25
Visual luminosity: 0.0028 x Sol
Variable type: delta Scuti (pulsating variable)
Color indices: B-V= +1.55, U-B= +1.15, R-I= +1.18
Diameter: 0.457 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.052 A.U.s
Angular size of star in sky in CZ: 4.641716 degrees


Component B:
Catalog numbers:
     Giclas (G) 170-34, Ross 867
Right Ascension and Declination: 17h17m53s, +26°32'48" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -5.71, -30.7, 15.6
Galactic (X,Y,Z) coordinates in ly: 19.7, 22.7, 17.9
Spectral class: M5e
Luminosity Class: V
Apparent visual magnitude: +12.97
Absolute visual magnitude: +12.82
Visual luminosity: 0.00065 x Sol
Color indices: B-V= +1.64, U-B= +0.73, R-I= +1.39
Diameter: 0.316 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.025 A.U.s
Angular size of star in sky in CZ: 6.614011 degrees

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