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

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]

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. 1 2 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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