Wolf 630

light-years

Catalog numbers:
     Gliese (Gl) 644, Henry Draper (HD) 152751, Bonner Durchmusterung (BD) -84352, Luyten Half-Second (LHS) 428, Hipparcos Input Catalog (HIC) 82817, Smithsonian Astrophysical Observatory (SAO) 141439, Vyssotsky McCormick (McC) 782, Wolf 630, Kuiper (KUI) 75
Arity: trinary
Points of interest:
     Wolf 629 was once believed to be gravitationally bound to this trio; however, even given the greatest possible error in measuring their parallaxes, Wolf 629 has to be at least one light-year away from Wolf 630 and is almost certainly farther away than that.

Right Ascension and Declination: 16h55m28.77s, -8°20'11.2" (epoch 2000.0)
Distance from Sol: 18.7 light-years (5.74 parsecs)
Standard error in distance: 2.1894%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -5.15, -17.8, -2.71
Galactic (X,Y,Z) coordinates in ly: 17.2, 3.46, 6.57
Proper motion: 1.183 arcsec/yr (222.2° from north)
Radial Velocity: 12.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 15.7, -29.3, 8.82

What do all these fields mean?

Data for A and B's orbit around one other:
Combined spectrum: M2.5e V
Combined absolute visual magnitude: +10.24
Combined visual luminosity: 0.0070 x Sol
Period: 1.715 years
Semimajor Axis: 1.25 A.U.s
Eccentricity: 0.05
Periastron distance: 1.19 A.U.s
Apastron distance: 1.31 A.U.s
Year in which periastron occurs: 1934.95
Source for orbit data: J. Voute
As seen from A:
     At periastron, B would appear as magnitude -20.09
     At apastron, B would appear as magnitude -19.87
As seen from B:
     At periastron, A would appear as magnitude -20.30
     At apastron, A would appear as magnitude -20.08

Data for B and C's orbit around one other:
Combined absolute visual magnitude: +11.10
Combined visual luminosity: 0.0032 x Sol
Observed Separation: 1268 A.U.s
As seen from B:
     C would appear as magnitude +1.93
As seen from C:
     B would appear as magnitude -4.95


Component A:
Proper names: V1054 Ophiuchi
Apparent visual magnitude: +9.69 (increasing to +8.09)
Absolute visual magnitude: +10.90 (increasing to +9.30)
Visual luminosity: 0.0038 x Sol (increasing to 0.017 x Sol)
Variable type: UV Ceti flare star (eruptive variable)
Mass: 0.38 x Sol
Diameter: 0.40 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.062 A.U.s
Orbital period in CZ: 9.09759 days
Tidal index in CZ: 1611.86
Angular size of star in sky in CZ: 3.460157 degrees


Component B:
Apparent visual magnitude: +9.90
Absolute visual magnitude: +11.11
Visual luminosity: 0.0031 x Sol
Mass: 0.38 x Sol
Diameter: 890.867 kilometers
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.056 A.U.s
Orbital period in CZ: 7.86907 days
Tidal index in CZ: 2154.44
Angular size of star in sky in CZ: 0.006084 degrees


Component C:
Catalog numbers:
     Luyten Half-Second (LHS) 429, VB 8
Right Ascension and Declination: 16h52m55s, -8°18'12" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -5.35, -17.7, -2.70
Galactic (X,Y,Z) coordinates in ly: 17.1, 3.34, 6.73
Proper motion: 1.19 arcsec/yr (222.5° from north)
Radial Velocity: 20 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 22.7, -28.2, 11.8
Spectral class: M7
Luminosity Class: V
Apparent visual magnitude: +16.78
Absolute visual magnitude: +17.99
Visual luminosity: 0.0000056 x Sol
Color indices: B-V= +1.99, R-I= +1.92
Diameter: 0.13 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0024 A.U.s
Angular size of star in sky in CZ: 29.377303 degrees

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