V1581 Cygni

light-years
Proper names: V1581 Cygni
Catalog numbers:
     Gliese & Jahreiss (GJ) 1245
Arity: binary
Right Ascension and Declination: 19h52m16s, +44°17'30" (epoch 1950.0)
Distance from Sol: 15.4 light-years (4.72 parsecs)
Standard error in distance: 1.988%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: 5.18, -9.72, 10.7
Galactic (X,Y,Z) coordinates in ly: 2.94, 14.9, 2.28
Proper motion: 0.731 arcsec/yr (143.1° from north)
Source for proper motion: Gliese

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +14.55
Combined visual luminosity: 0.00013 x Sol
Observed Separation: 33.0 A.U.s
Source for orbit data: Harrington AJ 100, p. 559 (1990)
As seen from A:
     B would appear as magnitude -8.34
As seen from B:
     A would appear as magnitude -8.94


Component A:
Catalog numbers:
     Giclas (G) 208-44, Luyten Half-Second (LHS) 3494
Spectral class: M5.5e
Luminosity Class: V
Apparent visual magnitude: +13.41
Absolute visual magnitude: +15.04
Visual luminosity: 0.000084 x Sol
Color indices: B-V= +1.90, R-I= +1.65
Comfort Zone (visual): 0.0092 A.U.s


Component B:
Catalog numbers:
     Giclas (G) 208-45, Luyten Half-Second (LHS) 3495
Right Ascension and Declination: 19h52m17s, +44°17'30" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 5.18, -9.72, 10.7
Galactic (X,Y,Z) coordinates in ly: 2.94, 14.9, 2.28
Spectral class: M6
Luminosity Class: V
Apparent visual magnitude: +14.01
Absolute visual magnitude: +15.64
Visual luminosity: 0.000048 x Sol
Color indices: B-V= +1.98, R-I= +1.71
Comfort Zone (visual): 0.0069 A.U.s

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