GJ 1245

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V1581 Cygni
V1581CygLightCurve.png
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
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] / M6V [6]
Variable type UV Cet [7]
Astrometry
Radial velocity (Rv)3.93±0.38 [4]  km/s
Proper motion (μ)RA: 349.363(56)  mas/yr [4]
Dec.: −480.322(54)  mas/yr [4]
Parallax (π)214.5745 ± 0.0476  mas [4]
Distance 15.200 ± 0.003  ly
(4.660 ± 0.001  pc)
Absolute magnitude  (MV)15.12 / 18.41 [5] / 15.72 [3]
Orbit [8]
PrimaryGJ 1245 A
CompanionGJ 1245 C
Period (P)6147±17  d
Semi-major axis (a)0.8267±0.0008″
Eccentricity (e)0.334±0.002
Inclination (i)135.7±0.1°
Longitude of the node (Ω)261.2±0.2°
Periastron epoch (T)51506.8±2.1
Argument of periastron (ω)
(secondary)		36.1±0.2°
Details
GJ 1245 A
Mass 0.120±0.001 [5]   M☉
Radius 0.146±0.007 [5]   R☉
Luminosity 0.0014 [5]   L☉
Temperature 2,927 [5]   K
Metallicity [Fe/H]-0.07 [5]   dex
Age ~300[ citation needed ]  Myr
GJ 1245 C
Mass 0.081±0.001 [5]   M☉
Radius 0.087±0.004 [5]   R☉
Luminosity0.0003 [5]   L☉
Temperature 2,611 [5]   K
Metallicity [Fe/H]-0.08 [5]   dex
Other designations
V1581 Cyg, GJ  1245, WDS J19539+4425
GJ 1245 AC: G 208-44, LHS  3494, NLTT  48414, KIC  8451868, 2MASS J19535443+4424541 [9]
GJ 1245 B: G 208-45, LHS  3495, NLTT  48415, KIC  8451881, 2MASS J19535508+4424550 [6]
Database references
SIMBAD The system
A
C
B
Cygnus constellation map.svg
Red pog.png
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, located 15.2 light-years (4.7 parsecs ) away in the constellation Cygnus. 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 43rd closest stellar system to the Solar System. [10] GJ 1245 A and B are active flare stars, [11] and the pair are collectively designated V1581 Cygni. [12]

Contents

The largest of the three stars, GJ 1245 A (G 208-44 A) is only 12% the Sun's mass. [5] Of the other two stars, GJ 1245 C (G 208-44 B), is closest to star A at 2 AU away; [13] it is 8% of the Sun's mass. [5] The third star, GJ 1245 B (G 208-45), is 27 AU away from star A, [13] and is 10% of the Sun's mass; it would appear as bright as Venus does from Earth when viewed from star A.[ citation needed ]

See also

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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. 1 2 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 at VizieR.
  3. 1 2 3 "The One Hundred Nearest Star Systems". RECONS. Retrieved 2016-08-21.
  4. 1 2 3 4 5 6 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 at VizieR.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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 .
  6. 1 2 "G 208-45". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 11 June 2024.
  7. ↑ 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.
  8. ↑ 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 .
  9. ↑ "G 208-44". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 11 June 2024.
  10. ↑ 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. Data available at https://gruze.org/10pc/ Archived 12 March 2023 at the Wayback Machine
  11. ↑ 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.
  12. ↑ 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.
  13. 1 2 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 .

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