GJ 1245

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]

V1581 Cygni

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]
Distance15.200 ± 0.003 ly
(4.660 ± 0.001 pc)
Absolute magnitude (MV)15.31 / 15.72 / 18.46
Details
Luminosity0.000084 / 0.000048 L☉
Age~300 Myr
Other designations
GJ 1245, WDS J19539+4425, V1581 Cygni
G 208-44: NLTT 48414, LHS 3494, 2MASS J19535443+4424541
G 208-45: NLTT 48415, LHS 3495, 2MASS J19535508+4424550
Database references
SIMBADThe system
A
C
B
GJ 1245 is located in the constellation Cygnus.
GJ 1245 is located in the constellation Cygnus.
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.

See also

References
  1. Cristaldi, S.; Rodonò, M. (April 1976). "Discovery of Flare Activity in the Visual Binary G 208-44/45". Astronomy and Astrophysics. 48: 165. Bibcode:1976A&A....48..165C. Retrieved 28 December 2021.
  2. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. "The One Hundred Nearest Star Systems". RECONS. Retrieved 2016-08-21.
  5. Lurie, John C.; Davenport, James R. A.; Hawley, Suzanne L.; Wilkinson, Tessa D.; Wisniewski, John P.; Kowalski, Adam F.; Hebb, Leslie (2015). "Kepler Flares III: Stellar Activity on GJ 1245A and B". The Astrophysical Journal. 800 (2): 95. arXiv:1412.6109. Bibcode:2015ApJ...800...95L. doi:10.1088/0004-637X/800/2/95. S2CID 51773906.
  6. Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (1978). "63rd Name-List of Variable Stars". Information Bulletin on Variable Stars. 1414: 1. Bibcode:1978IBVS.1414....1K.

Further reading


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