Bonner Durchmusterung +45°2743

light-years

Catalog numbers:
     Gliese (Gl) 720, Bonner Durchmusterung (BD) +45°2743, Hipparcos Input Catalog (HIC) 91128, Vyssotsky McCormick (McC) 182, New Suspected Variable (NSV) 11090, Luyten FT (LFT) 1421
Arity: binary
Right Ascension and Declination: 18h35m18.407s, +45°44'38.19" (epoch 2000.0)
Distance from Sol: 50.5 light-years (15.5 parsecs)
Standard error in distance: 1.5692%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 5.41, -34.8, 36.2
Galactic (X,Y,Z) coordinates in ly: 12.5, 45.3, 18.5
Proper motion: 0.566 arcsec/yr (53.0° from north)
Radial Velocity: -31.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -38.1, -10.5, -33.8

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +8.84
Combined visual luminosity: 0.025 x Sol
Observed Separation: 1780 A.U.s
As seen from A:
     B would appear as magnitude -3.25
As seen from B:
     A would appear as magnitude -6.42


Component A:
Catalog numbers:
     Giclas (G) 205-30, Luyten Half-Second (LHS) 3394
Spectral class: M2
Luminosity Class: V
Apparent visual magnitude: +9.85
Absolute visual magnitude: +8.90
Visual luminosity: 0.024 x Sol
Color indices: B-V= +1.42, U-B= +1.15, R-I= +0.73
Diameter: 0.58 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.15 A.U.s
Angular size of star in sky in CZ: 1.997952 degrees


Component B:
Catalog numbers:
     Giclas (G) 205-32, Luyten Half-Second (LHS) 3395, Luyten Two-Tenth (LTT) 18475, VB 9
Right Ascension and Declination: 18h33m59s, +45°42'54" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 5.21, -34.9, 36.1
Galactic (X,Y,Z) coordinates in ly: 12.6, 45.2, 18.7
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +13.02
Absolute visual magnitude: +12.07
Visual luminosity: 0.0013 x Sol
Color indices: B-V= +1.60, R-I= +1.18
Diameter: 0.22 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.036 A.U.s
Angular size of star in sky in CZ: 3.262954 degrees

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