AB Doradus

light-years
Proper names: AB Doradus
Catalog numbers:
     Henry Draper (HD) 36705, Hipparcos Input Catalog (HIC) 25647, Boss General Catalogue (GC) 6821, Cape Photographic Durchmusterung (CPD) -65°475, Cordoba Durchmusterung (CD) -65°332, Smithsonian Astrophysical Observatory (SAO) 249286, Two Micron All Sky Survey (2MASS) J05284484-6526551, Catalogue of Components of Double and Multiple stars (CCDM) 05287-6527, Chopped Photometric Channel (CPC) 21 995
Arity: binary
Points of interest:
     The distance measured to this star by Hipparcos is inconsistent with the reported luminosity class of the A component. Either this star is much further away than this, or the A component is a main sequence star and not a red giant at all.

Right Ascension and Declination: 5h28m44.828s, -65°26'54.853" (epoch 2000.0)
Distance from Sol: 48.77 light-years (14.95 parsecs)
Standard error in distance: 0.8005%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 2.755, 20.08, -44.36
Galactic (X,Y,Z) coordinates in ly: 3.743, -40.72, -26.59
Proper motion: 0.14 arcsec/yr (20.9° from north)
Radial Velocity: 28 km/sec
Galactic (U,V,W) velocity components in km/s: -7.267, -25.65, -13.11

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +6.07
Combined visual luminosity: 0.324 x Sol
Observed Separation: 149.5 A.U.s
Source for orbit data: Vilhu and Linsky PASP99,1071-87
As seen from A:
     B would appear as magnitude -8.57
As seen from B:
     A would appear as magnitude -14.62


Component A:
Spectral class: K1
Luminosity Class: IIIp
Apparent visual magnitude: +6.95
Absolute visual magnitude: +6.08
Visual luminosity: 0.323 x Sol
Color indices: B-V= +0.83, U-B= +0.37, R-I= +0.47
Comfort Zone (visual): 0.568 A.U.s
Detected companions: 1
Companion b:
     Mass: 88 x Jupiter
     Source for mass: Guirado et al.
     Period: 8.21 years
     Semimajor Axis: 6 A.U.s
     Eccentricity: 0
     Periastron distance: 6 A.U.s
     Apastron distance: 6 A.U.s
     Source for orbit data: Guirado et al.


Component B:
Right Ascension and Declination: 5h28m45s, -65°26'48" (epoch 2000.0)
Celestial (X,Y,Z) coordinates in ly: 2.755, 20.08, -44.36
Galactic (X,Y,Z) coordinates in ly: 3.741, -40.72, -26.59
Spectral class: M3.5
Luminosity Class: V
Apparent visual magnitude: +13.00
Absolute visual magnitude: +12.13
Visual luminosity: 0.00123 x Sol
Comfort Zone (visual): 0.0350 A.U.s

light-years
but not more than light-years away
Data for this star system were most recently updated on 20-January-2005.