V547 Cassiopeiae

Proper names: V547 Cassiopeiae
Catalog numbers:
Gliese (Gl) 22, Bonner Durchmusterung (BD) +66°34, Giclas (G) 243-30, Hipparcos Input Catalog (HIC) 2552, Aitken Double Star (ADS) 440, Vyssotsky (VYS) 2
Arity: trinary
Points of interest:
The naming of the components of this star is a bit unusual, with A and C forming the close-orbiting pair and B orbiting the two of them at a greater distance. This is because the third (C) star is so close to the first (A) star that it wasn’t resolved until after the other two components had been catalogued and named.

Right Ascension and Declination: 0h32m30.07s, +67°14'7.6" (epoch 2000.0)
Distance from Sol: 33.0 light-years (10.1 parsecs)
Standard error in distance: 3.3004%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 12.7, 1.81, 30.5
Galactic (X,Y,Z) coordinates in ly: -17.2, 28.1, 2.70
Proper motion: 1.748 arcsec/yr (97.8° from north)
Radial Velocity: -4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -68.8, -45.1, -17.0

What do all these fields mean?

Data for A and C's orbit around one other:
Combined spectrum: M2.5e V
Combined apparent visual magnitude: +10.38
Combined absolute visual magnitude: +10.35
Combined visual luminosity: 0.0063 x Sol
Period: 15.95 years
Semimajor Axis: 1.27 A.U.s
Eccentricity: 0.05
Periastron distance: 1.20 A.U.s
Apastron distance: 1.33 A.U.s
Year in which periastron occurs: 1956
Source for orbit data: J.L. Hershey

Data for (A-C) and B's orbit around one other:
Combined absolute visual magnitude: +10.20
Combined visual luminosity: 0.0073 x Sol
Period: 320 years
Semimajor Axis: 41.1 A.U.s
Eccentricity: 0
Periastron distance: 41.1 A.U.s
Apastron distance: 41.1 A.U.s
Year in which periastron occurs: 1993
Source for orbit data: J.L. Hershey
As seen from (A-C):
     At periastron, B would appear as magnitude -11.13
     At apastron, B would appear as magnitude -11.13
As seen from B:
     At periastron, (A-C) would appear as magnitude -13.15
     At apastron, (A-C) would appear as magnitude -13.15

Component A:
Catalog numbers:
Luyten Half-Second (LHS) 114

Component C:
Catalog numbers:
Luyten Half-Second (LHS) 114

Component B:
Catalog numbers:
Luyten Half-Second (LHS) 115
Spectral class: M3.5
Luminosity Class: V
Apparent visual magnitude: +12.40
Absolute visual magnitude: +12.37
Visual luminosity: 0.00098 x Sol
Mass: 0.38 x Sol
Comfort Zone (visual): 0.031 A.U.s
Orbital period in CZ: 3.2798 days
Tidal index in CZ: 12401.8

Data for this star system were most recently updated on 4-April-2001.