Delta Velorum

light-years
Proper names: Delta Velorum
Catalog numbers:
     Gliese (Gl) 321.3, Henry Draper (HD) 74956, Cape Photographic Durchmusterung (CPD) -54°1788, Hipparcos Input Catalog (HIC) 42913, Smithsonian Astrophysical Observatory (SAO) 236232, Hoffleit Bright Star (HR) 3485
Arity: quarternary (!)
Right Ascension and Declination: 8h44m42.224s, -54°42'30.12" (epoch 2000.0)
Distance from Sol: 79.75 light-years (24.45 parsecs)
Standard error in distance: 0.9205%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -30.33, 34.68, -65.09
Galactic (X,Y,Z) coordinates in ly: 3.246, -79.02, -10.17
Proper motion: 0.082 arcsec/yr (164.6° from north)
Radial Velocity: 2.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 8.809, -1.347, -3.967

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +0.01
Combined visual luminosity: 86.24 x Sol
Period: 142 years
Semimajor Axis: 63.57 A.U.s
Eccentricity: 0
Periastron distance: 63.57 A.U.s
Apastron distance: 63.57 A.U.s
As seen from A:
     At periastron, B would appear as magnitude -19.50
     At apastron, B would appear as magnitude -19.50
As seen from B:
     At periastron, A would appear as magnitude -22.48
     At apastron, A would appear as magnitude -22.48

Data for (A-B) and (C-D)'s orbit around one other:
Combined absolute visual magnitude: +0.01
Combined visual luminosity: 86.26 x Sol
Observed Separation: 1692 A.U.s
Year of separation observation: 1913
As seen from (A-B):
     (C-D) would appear as magnitude -6.47
As seen from (C-D):
     (A-B) would appear as magnitude -15.42

Data for C and D's orbit around one other:
Combined absolute visual magnitude: +8.96
Combined visual luminosity: 0.0228 x Sol
Observed Separation: 151.6 A.U.s
Year of separation observation: 1935
As seen from C:
     D would appear as magnitude -9.11
As seen from D:
     C would appear as magnitude -11.61


Component A:
NOTE: This star is actually a close-orbiting binary pair. The data below are for both sub-components of the pair combined.
Spectral class: A0
Luminosity Class: V
Apparent visual magnitude: +2.02
Absolute visual magnitude: +0.08
Visual luminosity: 81.03 x Sol
Diameter: 3.495 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 9.002 A.U.s
Angular size of star in sky in CZ: 0.206980 degrees


Component B:
Apparent visual magnitude: +5.00
Absolute visual magnitude: +3.06
Visual luminosity: 5.207 x Sol
Comfort Zone (visual): 2.282 A.U.s


Component C:
Right Ascension and Declination: 8h43m26s, -54°30'54" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -30.28, 35.01, -64.94
Galactic (X,Y,Z) coordinates in ly: 2.876, -79.03, -10.21
Proper motion: 0.08 arcsec/yr (164.0° from north)
Radial Velocity: 2.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 8.642, -1.420, -3.756
Apparent visual magnitude: +11.00
Absolute visual magnitude: +9.06
Visual luminosity: 0.0207 x Sol
Diameter: 0.58 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.144 A.U.s
Angular size of star in sky in CZ: 2.147881 degrees


Component D:
Right Ascension and Declination: 8h43m26s, -54°30'54" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -30.28, 35.01, -64.94
Galactic (X,Y,Z) coordinates in ly: 2.876, -79.03, -10.21
Proper motion: 0.08 arcsec/yr (164.0° from north)
Radial Velocity: 2.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 8.642, -1.420, -3.756
Apparent visual magnitude: +13.50
Absolute visual magnitude: +11.56
Visual luminosity: 0.00207 x Sol
Diameter: 0.35 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0455 A.U.s
Angular size of star in sky in CZ: 4.098971 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 21-January-2004.