Astronomy:GJ 1245

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Short description: Triple star system in the constellation Cygnus

Coordinates: Sky map 19h 53m 54.492s, +44° 24′ 53.41″

V1581 Cygni
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

Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Cygnus[1]
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)[4] mas/yr
Dec.: −480.322(54)[4] mas/yr
Parallax (π)214.5745 ± 0.0476[4] mas
Distance15.200 ± 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)6,147±17 days
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
Mass0.120±0.001[5] M☉
Radius0.146±0.007[5] R☉
Luminosity0.0014[5] L☉
Temperature2,927[5] K
Metallicity [Fe/H]−0.07[5] dex
Age~300[citation needed] Myr
GJ 1245 C
Mass0.081±0.001[5] M☉
Radius0.087±0.004[5] R☉
Luminosity0.0003[5] L☉
Temperature2,611[5] K
GJ 1245 B
Mass0.115[9] M☉
Radius0.142[9] R☉
Luminosity0.00123[9] L☉
Surface gravity (log g)5.20[9] cgs
Temperature2,865[9] K
Metallicity [Fe/H]−0.05[10] dex
Rotation0.71[11] days
Rotational velocity (v sin i)7[11] km/s
Age3.1[10] Gyr
Other designations
V1581 Cyg, GJ 1245, WDS J19539+4425
GJ 1245 AC: G 208-44, LHS 3494, NLTT 48414, KIC 8451868, 2MASS J19535443+4424541[12]
GJ 1245 B: G 208-45, LHS 3495, NLTT 48415, KIC 8451881, 2MASS J19535508+4424550[6]
Database references
AC
B
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)[13]

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.[14] GJ 1245 A and B are both active flare stars,[15] and the pair are collectively designated V1581 Cygni.[16]

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;[17] 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,[17] and is estimated to complete an orbit every 279 years.[18] It is slightly smaller and less luminous than GJ 1245 A.[9]

See also

  • List of nearest stars

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 "The One Hundred Nearest Star Systems". RECONS. http://www.recons.org/TOP100.posted.htm. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 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. doi:10.3847/1538-3881/abd2c2. Bibcode: 2021AJ....161..172D. 
  6. ↑ 6.0 6.1 "G 208-45". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+208-45. 
  7. ↑ Samus, N. N. 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. et al. (November 2016). "The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence M Dwarfs". The Astronomical Journal 152 (5): 141. doi:10.3847/0004-6256/152/5/141. Bibcode: 2016AJ....152..141B. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal 804 (1): 64. doi:10.1088/0004-637X/804/1/64. Bibcode: 2015ApJ...804...64M. 
  11. ↑ 11.0 11.1 Morin, J.; Donati, J. -F.; Petit, P.; Delfosse, X.; Forveille, T.; Jardine, M. M. (2010). "Large-scale magnetic topologies of late M dwarfs". Monthly Notices of the Royal Astronomical Society 407 (4): 2269. doi:10.1111/j.1365-2966.2010.17101.x. Bibcode: 2010MNRAS.407.2269M. 
  12. ↑ "G 208-44". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+208-44. 
  13. ↑ 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. 
  14. ↑ 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. doi:10.1051/0004-6361/202140985. Bibcode: 2021A&A...650A.201R.  Data available at https://gruze.org/10pc/
  15. ↑ 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. doi:10.1088/0004-637X/800/2/95. Bibcode: 2015ApJ...800...95L. 
  16. ↑ 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. 
  17. ↑ 17.0 17.1 Salama, Maïssa 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. doi:10.3847/1538-3881/ac0445. Bibcode: 2021AJ....162..102S. 
  18. ↑ Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T. 

Further reading



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