Harvard Observatory 298

light-years

Catalog numbers:
     Gliese (Gl) 853, Henry Draper (HD) 211415, Cape Photographic Durchmusterung (CPD) -54°10055, Luyten Half-Second (LHS) 3790, Hipparcos Input Catalog (HIC) 110109, Smithsonian Astrophysical Observatory (SAO) 247400, Hoffleit Bright Star (HR) 8501, Harvard Observatory (HDO) 298
Arity: binary
Right Ascension and Declination: 22h18m15.656s, -53°37'38.01" (epoch 2000.0)
Distance from Sol: 44.39 light-years (13.61 parsecs)
Standard error in distance: 0.9438%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 23.78, -11.31, -35.75
Galactic (X,Y,Z) coordinates in ly: 25.55, -9.805, -34.95
Proper motion: 0.778 arcsec/yr (145.9° from north)
Radial Velocity: -13.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -29.36, -42.23, 7.523

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +4.70
Combined visual luminosity: 1.144 x Sol
Observed Separation: 31.31 A.U.s
Year of separation observation: 1900
As seen from A:
     B would appear as magnitude -14.86
As seen from B:
     A would appear as magnitude -19.37

Data for A and B's orbit, take 2:
Observed Separation: 46.28 A.U.s
Year of separation observation: 1959
As seen from A:
     B would appear as magnitude -14.01
As seen from B:
     A would appear as magnitude -18.52


Component A:
Spectral class: G1
Luminosity Class: V
Apparent visual magnitude: +5.39
Absolute visual magnitude: +4.72
Visual luminosity: 1.127 x Sol
Diameter: 1.02 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.061 A.U.s
Angular size of star in sky in CZ: 0.512303 degrees


Component B:
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +9.90
Absolute visual magnitude: +9.23
Visual luminosity: 0.0177 x Sol
Diameter: 0.56 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.133 A.U.s
Angular size of star in sky in CZ: 2.244702 degrees

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