Luyten Double Star 135

light-years

Catalog numbers:
     Gliese (Gl) 186.1, Henry Draper (HD) 32778, Cordoba Durchmusterung (CD) -56°1071, Hipparcos Input Catalog (HIC) 23437, Smithsonian Astrophysical Observatory (SAO) 233796, Luyten Double Star (LDS) 135, Woolley (Wo) 9172
Arity: binary
Right Ascension and Declination: 5h2m17.51s, -56°4'48.5" (epoch 2000.0)
Distance from Sol: 72.6 light-years (22.3 parsecs)
Standard error in distance: 1.2742%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 10.1, 39.2, -60.2
Galactic (X,Y,Z) coordinates in ly: -5.79, -57.5, -43.9
Proper motion: 0.722 arcsec/yr (356.8° from north)
Radial Velocity: 2.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -74.5, 12.0, -10.8

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +5.25
Combined visual luminosity: 0.69 x Sol
Observed Separation: 1736 A.U.s
As seen from A:
     B would appear as magnitude -6.51
As seen from B:
     A would appear as magnitude -10.09


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 1724, Cape Photographic Durchmusterung (CPD) -56°767
Spectral class: G5
Luminosity Class: V
Apparent visual magnitude: +7.02
Absolute visual magnitude: +5.29
Visual luminosity: 0.67 x Sol
Color indices: B-V= +0.63, U-B= +0.03, R-I= +0.25
Diameter: 0.88 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.82 A.U.s
Angular size of star in sky in CZ: 0.573505 degrees


Component B:
Catalog numbers:
     Cape Photographic Durchmusterung (CPD) -56°768, Luyten Half-Second (LHS) 1727, Luyten Two-Tenth (LTT) 2159, Luyten (L) 179-10
Right Ascension and Declination: 5h1m28s, -56°10'30" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 10.2, 39.1, -60.3
Galactic (X,Y,Z) coordinates in ly: -5.65, -57.5, -44.0
Proper motion: 0.62 arcsec/yr (354.0° from north)
Radial Velocity: 2.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -63.2, 11.9, -12.2
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +10.60
Absolute visual magnitude: +8.86
Visual luminosity: 0.025 x Sol
Color indices: B-V= +1.36, U-B= +1.14, R-I= +0.62
Comfort Zone (visual): 0.16 A.U.s

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