Triple star system in the constellation Cygnus
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 dataEpoch J2000 Equinox J2000 Constellation Cygnus GJ 1245 AC Right ascension 19h 53m 55.142s [ 2] Declination +44° 24′ 44.39″[ 2] Apparent magnitude (V)13.46 / 16.75[ 3] GJ 1245 B Right ascension 19h 53m 55.141s [ 4] Declination +44° 24′ 54.15″[ 4] Apparent magnitude (V)14.01[ 3] Characteristics Spectral type M6V / M8V[ 5] [ 6] Variable type UV Cet [ 7] Astrometry Radial velocity (Rv )± 0.38[ 4] km/s Proper motion (μ)RA: mas /yr [ 4] Dec.: mas /yr [ 4] Parallax (π)214.5745± 0.0476 mas [ 4] Distance 15.200 ± 0.003 ly pc ) Absolute magnitude (MV )15.12 / 18.41[ 5] [ 3] Orbit [ 8] Primary GJ 1245 A Companion GJ 1245 C Period (P)± 17 d Semi-major axis (a)± 0.0008Eccentricity (e)± 0.002Inclination (i)± 0.1Longitude of the node (Ω)± 0.2Periastron epoch (T)506 .8± 2.1Argument of periastron (ω)± 0.2Details GJ 1245 A Mass ± 0.001[ 5] M ☉ Radius ± 0.007[ 5] R ☉ Luminosity 0.0014[ 5] L ☉ Temperature [ 5] K Metallicity -0.07[ 5] dex Age ~300[citation needed Myr GJ 1245 C Mass ± 0.001[ 5] M ☉ Radius ± 0.004[ 5] R ☉ Luminosity 0.0003[ 5] L ☉ Temperature [ 5] K Metallicity -0.08[ 5] dex Other designations V1581 Cyg GJ 1245WDS J19539+4425GJ 1245 AC :G 208-44LHS 3494NLTT 48414KIC 84518682MASS J19535443+4424541[ 9] GJ 1245 B :G 208-45LHS 3495NLTT 48415KIC 84518812MASS J19535508+4424550[ 6] Database references SIMBAD The system A C B Location of GJ 1245 in the constellation
Cygnus
GJ 1245 (Gliese 1245) is a double star with componentsG 208-44 andG 208-45 , located 15.2light-years (4.7parsecs ) away in the constellationCygnus . G 208-44 is itself a closer double star made up of twored dwarfs , while G 208-45 is also a red dwarf. GJ 1245 is the 43rdclosest stellar system to the Solar System.[ 10] flare stars ,[ 11] [ 12]
The largest of the three stars, GJ 1245 A (G 208-44 A) is only 12% theSun's mass .[ 5] AU away;[ 13] [ 5] [ 13] Venus does fromEarth when viewed from star A.[citation needed
^ 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 . Retrieved28 December 2021 . ^a b Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b c "The One Hundred Nearest Star Systems" .RECONS . Retrieved2016-08-21 .^a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b c d e f g h i j k l m n Dieterich, Serge B.; Simler, Andrew; Henry, Todd J.; Jao, Wei-Chun (April 2021)."The Solar Neighborhood. XLVII. Comparing M-dwarf Models with Hubble Space Telescope Dynamical Masses and Spectroscopy" .The Astronomical Journal 161 (4): 172.arXiv :2012.00915 Bibcode :2021AJ....161..172D .doi :10.3847/1538-3881/abd2c2 ^a b "G 208-45" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved11 June 2024 .^ 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 . ^ Benedict, G. F.; Henry, T. J.; et al. (November 2016)."The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence M Dwarfs" .The Astronomical Journal 152 (5): 141.arXiv :1608.04775 Bibcode :2016AJ....152..141B .doi :10.3847/0004-6256/152/5/141 ^ "G 208-44" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved11 June 2024 .^ Reylé, Céline; Jardine, Kevin; Fouqué, Pascal; Caballero, Jose A.; Smart, Richard L.; Sozzetti, Alessandro (30 April 2021). "The 10 parsec sample in the Gaia era".Astronomy & Astrophysics 650 : A201.arXiv :2104.14972 Bibcode :2021A&A...650A.201R .doi :10.1051/0004-6361/202140985 .S2CID 233476431 . https://gruze.org/10pc/ Archived 12 March 2023 at theWayback Machine ^ 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 . ^ 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 . ^a b Salama, Maïssa; Ou, James; et al. (September 2021)."Large Adaptive Optics Survey for Substellar Objects around Young, Nearby, Low-mass Stars with Robo-AO" .The Astronomical Journal 162 (3): 102.arXiv :2105.13364 Bibcode :2021AJ....162..102S .doi :10.3847/1538-3881/ac0445 Harrington, R. S.; Dahn, C. C.; Kallarakal, V. V.; Guetter, H. H.; Riepe, B. Y.; Walker, R. L.; Pier, J. R.; Vrba, F. J.; Luginbuhl, C. B.; Harris, H. C.; Ables, H. D. (1993). "U.S. Naval Observatory photographic parallaxes - List IX".Astronomical Journal 105 (4):1571– 1580.Bibcode :1993AJ....105.1571H .doi :10.1086/116537 . Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Beaulieu, Thomas D.; Jao, Wei-Chun; Hambly, Nigel C. (2004). "The Solar Neighborhood. X. New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs".The Astronomical Journal 128 (5):2460– 2473.arXiv :astro-ph/0408240 Bibcode :2004AJ....128.2460H .doi :10.1086/425052 .S2CID 15759789 . Smart, R. L.; Ioannidis, G.; Jones, H. R. A.; Bucciarelli, B.; Lattanzi, M. G. (2010). "Cool dwarfs stars from the Torino Observatory Parallax Program".Astronomy and Astrophysics 514 : A84.arXiv :1003.1465 Bibcode :2010A&A...514A..84S .doi :10.1051/0004-6361/200913424 .S2CID 17961025 . Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs".The Astrophysical Journal 784 (2): 156.arXiv :1312.3241 Bibcode :2014ApJ...784..156D .doi :10.1088/0004-637X/784/2/156 .S2CID 18789867 . Table with parallaxes .
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