GJ 1245 (Gliese 1245) is a double star with components G 208-44 and G 208-45, 14 light-years away, relatively close to the Solar System. G 208-44 is itself a closer double star made up of two red dwarfs, while G 208-45 is also a red dwarf. GJ 1245 is the 37th closest stellar system to the Solar System, located in the constellation Cygnus.[4] GJ 1245 A and B are active flare stars,[5] and the pair are collectively designated V1581 Cygni.[6]
A blue band light curve for a flare of V1581 Cygni. The left-most point shows a 1 sigma error bar. Adapted from Cristaldi and Rodonò (1976)[1] | |
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 |
Characteristics | |
Spectral type | M5.5 / M6 / M5.5 |
Variable type | UV Cet[2] |
Astrometry | |
Proper motion (μ) | RA: 349.363±0.056[3] mas/yr Dec.: −480.322±0.054[3] mas/yr |
Parallax (π) | 214.5745 ± 0.0476 mas[3] |
Distance | 15.200 ± 0.003 ly (4.660 ± 0.001 pc) |
Absolute magnitude (MV) | 15.31 / 15.72 / 18.46 |
Details | |
Luminosity | 0.000084 / 0.000048 L☉ |
Age | ~300 Myr |
Other designations | |
G 208-44: NLTT 48414, LHS 3494, 2MASS J19535443+4424541 | |
G 208-45: NLTT 48415, LHS 3495, 2MASS J19535508+4424550 | |
Database references | |
SIMBAD | The system |
A | |
C | |
B | |
GJ 1245 Location of GJ 1245 in the constellation Cygnus |
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.