GJ 1245
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 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] |
| Distance | 15.200 ± 0.003 ly (4.660 ± 0.001 pc) |
| Absolute magnitude (MV) | 15.31 / 15.72 / 18.46 |
| Details | |
| Luminosity | 0.000084 / 0.000048 L☉ |
| Age | ~300 Myr |
| Other designations | |
| G 208-44: NLTT 48414, LHS 3494, 2MASS J19535443+4424541 | |
| G 208-45: NLTT 48415, LHS 3495, 2MASS J19535508+4424550 | |
| Database references | |
| SIMBAD | The system |
| A | |
| C | |
| B | |
  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[edit]
References[edit]
- ^ 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.
- ^ 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.
- ^ a b c 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.
- ^ "The One Hundred Nearest Star Systems". RECONS. Retrieved 2016-08-21.
- ^ 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.
Further reading[edit]
- 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.
External links[edit]
- http://jumk.de/astronomie/near-stars/v1581-cygni.shtml
- http://www.answers.com/topic/list-of-nearest-stars?cat=travel
- http://www.richweb.f9.co.uk/astro/nearby_stars.htm
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