Groombridge 34

light-years

Catalog numbers:
     Gliese (Gl) 15, Henry Draper (HD) 1326, Bonner Durchmusterung (BD) +4344, Hipparcos Input Catalog (HIC) 1475, Smithsonian Astrophysical Observatory (SAO) 36248, Aitken Double Star (ADS) 246, Vyssotsky McCormick (McC) 85, Groombridge (GRB) 34
Arity: binary
Right Ascension and Declination: 0h18m23.31s, +44°1'23.7" (epoch 2000.0)
Distance from Sol: 11.64 light-years (3.568 parsecs)
Standard error in distance: 0.3732%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 8.341, 0.671, 8.087
Galactic (X,Y,Z) coordinates in ly: -5.056, 9.829, -3.641
Proper motion: 2.912 arcsec/yr (81.8° from north)
Radial Velocity: 12 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -49.13, -12.14, -2.899

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +10.26
Combined visual luminosity: 0.00686 x Sol
Period: 2600 years
Semimajor Axis: 146.8 A.U.s
Eccentricity: 0
Periastron distance: 146.8 A.U.s
Apastron distance: 146.8 A.U.s
Year in which periastron occurs: 1745
Source for orbit data: S.L. Lippincott
As seen from A:
     At periastron, B would appear as magnitude -7.44
     At apastron, B would appear as magnitude -7.44
As seen from B:
     At periastron, A would appear as magnitude -10.41
     At apastron, A would appear as magnitude -10.41

Data for A and B's orbit, take 2:
Period: 3000 years
Semimajor Axis: 157.0 A.U.s
Eccentricity: 0.25
Periastron distance: 117.7 A.U.s
Apastron distance: 196.2 A.U.s
Source for orbit data: Hopmann
As seen from A:
     At periastron, B would appear as magnitude -7.92
     At apastron, B would appear as magnitude -6.81
As seen from B:
     At periastron, A would appear as magnitude -10.89
     At apastron, A would appear as magnitude -9.78


Component A:
Proper names: GX Andromedae
Catalog numbers:
     Giclas (G) 171-47, Luyten Half-Second (LHS) 3
Spectral class: M1.5n
Luminosity Class: V
Apparent visual magnitude: +8.09 (increasing to +7.99)
Absolute visual magnitude: +10.33 (increasing to +10.23)
Visual luminosity: 0.00644 x Sol (increasing to 0.00706 x Sol)
Variable type: UV Ceti flare star (eruptive variable)
Color indices: B-V= +1.56, U-B= +1.22, R-I= +0.88
Mass: 0.414 x Sol
Source for mass: European Southern Observatory
Diameter: 0.383 x Sol
Source for diameter: European Southern Observatory
Comfort Zone (visual): 0.0802 A.U.s
Orbital period in CZ: 12.9016 days
Tidal index in CZ: 801.48
Angular size of star in sky in CZ: 2.547867 degrees


Component B:
Proper names: GQ Andromedae
Catalog numbers:
     Giclas (G) 171-48, Luyten Half-Second (LHS) 4
Proper motion: 2.912 arcsec/yr (81.8° 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: -48.83, -12.73, -2.680
Spectral class: M3.5n
Luminosity Class: V
Apparent visual magnitude: +11.06
Absolute visual magnitude: +13.30
Visual luminosity: 0.000418 x Sol
Variable type: UV Ceti flare star (eruptive variable)
Color indices: B-V= +1.79, U-B= +1.39, R-I= +1.24
Mass: 0.08 x Sol
Diameter: 0.19 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0204 A.U.s
Orbital period in CZ: 3.77186 days
Tidal index in CZ: 9377.13
Angular size of star in sky in CZ: 4.957141 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 26-April-2003.