Mu Herculis

light-years
Proper names: Mu Herculis, 86 Herculis
Catalog numbers:
     Gliese (Gl) 695, Henry Draper (HD) 161797, Bonner Durchmusterung (BD) +272888, Hipparcos Input Catalog (HIC) 86974, Smithsonian Astrophysical Observatory (SAO) 85397, Aitken Double Star (ADS) 10786, Fifth Fundamental Catalogue (FK5) 667, Hoffleit Bright Star (HR) 6623, Catalogue Astrographique (AC) 7
Heavy element abundance: 196% of Sol
Standard error in heavy element abundance: 15%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: trinary
Right Ascension and Declination: 17h46m27.517s, +27°43'14.35" (epoch 2000.0)
Distance from Sol: 27.40 light-years (8.400 parsecs)
Standard error in distance: 0.5181%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -1.432, -24.21, 12.74
Galactic (X,Y,Z) coordinates in ly: 15.06, 19.69, 11.67
Proper motion: 0.814 arcsec/yr (202.9° from north)
Radial Velocity: -16.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 15.95, -32.38, -5.169

What do all these fields mean?

Data for B and C's orbit around one other:
Combined absolute visual magnitude: +10.18
Combined visual luminosity: 0.00739 x Sol
Period: 43.2 years
Semimajor Axis: 11.42 A.U.s
Eccentricity: 0.178
Periastron distance: 9.390 A.U.s
Apastron distance: 13.46 A.U.s
Year in which periastron occurs: 1965.4
Source for orbit data: P. Couteau
As seen from B:
     At periastron, C would appear as magnitude -15.53
     At apastron, C would appear as magnitude -14.75
As seen from C:
     At periastron, B would appear as magnitude -15.98
     At apastron, B would appear as magnitude -15.20

Data for A and (B-C)'s orbit around one other:
Combined absolute visual magnitude: +3.79
Combined visual luminosity: 2.665 x Sol
Observed Separation: 251.2 A.U.s
Year of separation observation: 1831
As seen from A:
     (B-C) would appear as magnitude -9.39
As seen from (B-C):
     A would appear as magnitude -15.78

Data for A and (B-C)'s orbit, take 2:
Observed Separation: 285.6 A.U.s
Year of separation observation: 1955
As seen from A:
     (B-C) would appear as magnitude -9.12
As seen from (B-C):
     A would appear as magnitude -15.50


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 3326
Spectral class: G5
Luminosity Class: IV
Apparent visual magnitude: +3.41
Absolute visual magnitude: +3.79
Visual luminosity: 2.658 x Sol
Color indices: B-V= +0.75, U-B= +0.39, R-I= +0.24
Diameter: 1.444 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.630 A.U.s
Angular size of star in sky in CZ: 0.472316 degrees


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 3325
Right Ascension and Declination: 17h44m28s, +27°44'42" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -1.642, -24.19, 12.75
Galactic (X,Y,Z) coordinates in ly: 15.06, 19.58, 11.85
Proper motion: 0.827 arcsec/yr (204.2° from north)
Radial Velocity: -13.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 17.56, -30.96, -3.284
Spectral class: M3
Luminosity Class: V
Apparent visual magnitude: +10.35
Absolute visual magnitude: +10.73
Visual luminosity: 0.00445 x Sol
Diameter: 0.48 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0667 A.U.s
Angular size of star in sky in CZ: 3.835705 degrees


Component C:
Catalog numbers:
     Luyten Half-Second (LHS) 3325
Right Ascension and Declination: 17h44m28s, +27°44'42" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -1.642, -24.19, 12.75
Galactic (X,Y,Z) coordinates in ly: 15.06, 19.58, 11.85
Proper motion: 0.827 arcsec/yr (204.2° from north)
Radial Velocity: -16.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 16.02, -32.96, -4.495
Spectral class: M4
Luminosity Class: V
Apparent visual magnitude: +10.80
Absolute visual magnitude: +11.18
Visual luminosity: 0.00294 x Sol
Diameter: 0.4 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0542 A.U.s
Angular size of star in sky in CZ: 3.932497 degrees

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