G 208-44/208-45

V1581 Cygni
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 Suspected
Astrometry
Proper motion (μ) RA: 397 mas/yr
Dec.: −482 mas/yr
Parallax (π)220.2 ± 1.0[1] mas
Distance14.81 ± 0.07 ly
(4.54 ± 0.02 pc)
Absolute magnitude (MV)15.31 / 15.72 / 18.46
Details
Luminosity0.000084 / 0.000048 L☉
Orbit
CompanionG 208-44/208-45 B
Semi-major axis (a)33 AU"
Other designations
GJ 1245, G 208-44/208-45, NLTT 48414, LHS 3494.
Database references
SIMBADThe system
A
C
B

V1581 Cygni (G 208-44/208-45, GJ 1245) is a triple star system, 14 light-years away, relatively close to the Solar System. The star system contains G 208-44 A, G 208-44 B, and G 208-45. All of the stars are rather dim. It is the 42nd closest stellar system to the Solar System, located in the constellation Cygnus.[2]

Distance

G 208-44/208-45 distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Gliese & Jahreiß (1991) 212.0±4.3 4.72+0.1
−0.09		 15.38+0.32
−0.31		 145.6+3
−2.9		 [3]
Harrington et al. (1993) 219.2±1.4 4.562±0.029 14.88+0.1
−0.09		 140.8±0.9 [4]
van Altena et al. (1995) 220.2±1.0 4.541±0.021 14.81±0.07 140.1±0.6 [1]
? 215±3.0[note 1] 4.65+0.07
−0.06		 15.17±0.21 143.5±2
Henry et al. (2004) 4.69±0.79 15.3±2.6 144.7±24.4 [5]
Smart et al. (2010) 227.9±3.9 4.39+0.08
−0.07		 14.31+0.25
−0.24		 135.4+2.4
−2.3		 [6]
RECONS TOP100 (2012) 220.2±1.0[note 2] 4.541±0.021 14.81±0.07 140.1±0.6 [7]
Dittmann et al. (2014) (AC) 224.60±5.40 4.45+0.11
−0.1		 14.5+0.4
−0.3		 137.4+3.4
−3.2		 [8]
Dittmann et al. (2014) (B) 224.60±5.00 4.45±0.1 14.5±0.3 137.4+3.1
−3		 [8]

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

References

  1. ↑ 1.0 1.1 Van Altena W. F., Lee J. T., Hoffleit E. D. (1995). "GCTP 4706.01". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.). Retrieved 2014-10-22.
  2. ↑ "The One Hundred Nearest Star Systems". RECONS. Retrieved 2010-04-13.
  3. ↑ Gliese, W. and Jahreiß, H. (1991). "GJ 1245". Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-10-22.
  4. ↑ 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.
  5. ↑ 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.
  6. ↑ 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.
  7. ↑ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012. Retrieved 2014-10-22.
  8. ↑ 8.0 8.1 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.

Notes

  1. ↑ Parallax from earlier version of this article.
  2. ↑ Parallax from van Altena et al. (1995).

External links