Stars

Melbourne Observatory 4 15 light-years

Catalog numbers: Gliese (Gl) 667, Henry Draper (HD) 156384, Cordoba Durchmusterung (CD) -34°11626, Hipparcos Input Catalog (HIC) 84709, Smithsonian Astrophysical Observatory (SAO) 208670, UGPMF 433, Hoffleit Bright Star (HR) 6426, Melbourne Observatory (MLO) 4, New Suspected Variable (NSV) 8482 Heavy element abundance: 26% of Sol Source for heavy element abundance: Strobel [Fe/H] Determinations Arity: trinary Right Ascension and Declination: 17h18m57.164s, -34°59'24.25" (epoch 2000.0) Distance from Sol: 23 light-years (7.0 parsecs) Standard error in distance: 10.662% Source for distance: Hipparcos Celestial (X,Y,Z) coordinates in ly: -3.3, -18, -13 Galactic (X,Y,Z) coordinates in ly: 23, -3.1, 0.3 Proper motion: 1.167 arcsec/yr (99.2° from north) Source for proper motion: Gliese What do all these fields mean? Data for A and B's orbit around one other: Combined absolute visual magnitude: +6.68 Combined visual luminosity: 0.2 x Sol Period: 42.09 years Semimajor Axis: 13 A.U.s Eccentricity: 0.574 Periastron distance: 5.4 A.U.s Apastron distance: 20 A.U.s Year in which periastron occurs: 1933.7 Source for orbit data: W.P. Hirst As seen from A:    At periastron, B would appear as magnitude -19.92     At apastron, B would appear as magnitude -17.09 As seen from B:     At periastron, A would appear as magnitude -20.83 At apastron, A would appear as magnitude -18.00

Data for (A-B) and C's orbit around one other: Combined absolute visual magnitude: +6.66 Combined visual luminosity: 0.2 x Sol Observed Separation: 213 A.U.s Year of separation observation: 1889 As seen from (A-B): C would appear as magnitude -8.91 As seen from C:    (A-B) would appear as magnitude -13.25

Data for (A-B) and C's orbit, take 2: Observed Separation: 215 A.U.s Year of separation observation: 1948 As seen from (A-B): C would appear as magnitude -8.89 As seen from C:    (A-B) would appear as magnitude -13.23

Component A: Catalog numbers: Luyten Half-Second (LHS) 442 Spectral class: K3 Luminosity Class: V Apparent visual magnitude: +6.29 Absolute visual magnitude: +7.07 Visual luminosity: 0.1 x Sol Diameter: 0.9 x Sol Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988) Comfort Zone (visual): 0.4 A.U.s Angular size of star in sky in CZ: 1.312281 degrees

Component B: Catalog numbers: Luyten Half-Second (LHS) 442 Proper motion: 1.167 arcsec/yr (99.2° from north) Radial Velocity: 1 km/sec Source for proper motion and radial velocity: Gliese Galactic (U,V,W) velocity components in km/s: 3.8, 16, -35 Spectral class: K5 Luminosity Class: V Apparent visual magnitude: +7.20 Absolute visual magnitude: +7.98 Visual luminosity: 0.06 x Sol Comfort Zone (visual): 0.2 A.U.s

Component C: Catalog numbers: Luyten Half-Second (LHS) 443 Right Ascension and Declination: 17h15m34s, -34°56'30" (epoch 1950.0) Celestial (X,Y,Z) coordinates in ly: -3.6, -18, -13 Galactic (X,Y,Z) coordinates in ly: 22, -3.2, 0.6 Proper motion: 1.18 arcsec/yr (98.3° from north) Radial Velocity: 0.6 km/sec Source for proper motion and radial velocity: Gliese Galactic (U,V,W) velocity components in km/s: 4.0, 17, -35 Spectral class: M2.5 Luminosity Class: V Apparent visual magnitude: +10.24 Absolute visual magnitude: +11.02 Visual luminosity: 0.003 x Sol Color indices: B-V= +1.57, U-B= +1.16, R-I= +0.96 Comfort Zone (visual): 0.06 A.U.s

15 light-years 10 but not more than 15 light-years away Data for this star system were most recently updated on 4-April-2001.