G 208-44/208-45

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V1581 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 53m 54.492s
Declination +44° 24′ 53.41″
Apparent magnitude (V) 13.41 / 14.01 / 16.75
Spectral type M5.5 / M6 / M5.5
Variable type Suspected
Proper motion (μ) RA: 397 mas/yr
Dec.: −482 mas/yr
Parallax (π) 220.2 ± 1.0[1] mas
Distance 14.81 ± 0.07 ly
(4.54 ± 0.02 pc)
Absolute magnitude (MV) 15.31 / 15.72 / 18.46
Luminosity 0.000084 / 0.000048 L
Companion G 208-44/208-45 B
Semi-major axis (a) 33 AU
Other designations
GJ 1245, G 208-44/208-45, NLTT 48414, LHS 3494.
Database references
SIMBAD The system

V1581 Cygni (G 208-44/208-45, GJ 1245) is a triple star system, 14 light-years away, relatively close to the Solar System. The star system contains G 208-44 A, G 208-44 B, and G 208-45. All of the stars are rather dim. It is the 37th closest stellar system to the Solar System, located in the constellation Cygnus.[2]

GJ 1245 A and B are active flare stars.[3] The largest of the three stars, G208-44 A (GJ 1245 A) is only 11% the Sun's mass. Of the other two stars, G 208-44 B (GJ 1245 C), is closest to star A at 8 AU away; it is 7% of the Sun's Mass. The third star, GJ 1245 B, is 33 AU away from star A, and is 10% of the Sun's Mass; it would appear as bright as Venus does from Earth when viewed from star A.


  1. ^ Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 2835.01". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.). 
  2. ^ "The One Hundred Nearest Star Systems". RECONS. Retrieved 2016-08-21. 
  3. ^ John C. Lurie, James R. A. Davenport, Suzanne L. Hawley, Tessa D. Wilkinson, John P. Wisniewski, Adam F. Kowalski, Leslie Hebb, Kepler Flares III: Stellar Activity on GJ 1245 A and B.

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