Porrima

light-years
Proper names: Porrima, Gamma Virginis, 29 Virginis, Postvarta
Catalog numbers:
     Gliese (Gl) 482, Bonner Durchmusterung (BD) -0°2601, Hipparcos Input Catalog (HIC) 61941, Smithsonian Astrophysical Observatory (SAO) 138917, Aitken Double Star (ADS) 8630, Struve (STF) 1670, New Suspected Variable (NSV) 5859
Heavy element abundance: 66% of Sol
Standard error in heavy element abundance: 29%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: binary
Right Ascension and Declination: 12h41m39.595s, -1°26'57.88" (epoch 2000.0)
Distance from Sol: 38.6 light-years (11.8 parsecs)
Standard error in distance: 1.3767%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -37.9, -6.97, -0.98
Galactic (X,Y,Z) coordinates in ly: 9.11, -16.3, 33.8
Proper motion: 0.568 arcsec/yr (270.8° from north)
Radial Velocity: -19.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -31.9, -8.22, -18.1

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +2.37
Combined visual luminosity: 9.80 x Sol
Period: 171.37 years
Semimajor Axis: 44.3 A.U.s
Eccentricity: 0.881
Periastron distance: 5.27 A.U.s
Apastron distance: 83.4 A.U.s
Year in which periastron occurs: 1836.43
Source for orbit data: K.A. Strand
As seen from A:
     At periastron, B would appear as magnitude -24.81
     At apastron, B would appear as magnitude -18.81
As seen from B:
     At periastron, A would appear as magnitude -24.87
     At apastron, A would appear as magnitude -18.87


Component A:
Catalog numbers:
     Henry Draper (HD) 110379, Luyten Half-Second (LHS) 2604, Hoffleit Bright Star (HR) 4825
Spectral class: F0
Luminosity Class: V
Apparent visual magnitude: +3.46
Absolute visual magnitude: +3.10
Visual luminosity: 5.04 x Sol
Color indices: R-I= +0.11
Mass: 1.7 x Sol
Diameter: 2.54 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 2.24 A.U.s
Orbital period in CZ: 2.57801 years
Tidal index in CZ: 0.150463
Angular size of star in sky in CZ: 0.604138 degrees


Component B:
Catalog numbers:
     Henry Draper (HD) 110380, Luyten Half-Second (LHS) 2605, Hoffleit Bright Star (HR) 4826
Proper motion: 0.568 arcsec/yr (270.7° from north)
Radial Velocity: -19.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -31.8, -8.39, -17.9
Spectral class: F0
Luminosity Class: V
Apparent visual magnitude: +3.52
Absolute visual magnitude: +3.16
Visual luminosity: 4.76 x Sol
Color indices: R-I= +0.09
Mass: 1.7 x Sol
Diameter: 1.45 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 2.18 A.U.s
Orbital period in CZ: 2.47334 years
Tidal index in CZ: 0.163468
Angular size of star in sky in CZ: 0.354007 degrees

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