GJ 1245 explained

GJ 1245 (Gliese 1245) is a double star with components G 208-44 and G 208-45, located 15.2lk=onNaNlk=on 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. GJ 1245 A and B are active flare stars, and the pair are collectively designated V1581 Cygni.

The largest of the three stars, GJ 1245 A (G 208-44 A) is only 12% the Sun's mass. Of the other two stars, GJ 1245 C (G 208-44 B), is closest to star A at 2 AU away; it is 8% of the Sun's mass. The third star, GJ 1245 B (G 208-45), is 27 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

• List of nearest stars

Further reading

• 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. . U.S. Naval Observatory photographic parallaxes - List IX . 1993 . . 105 . 4 . 1571–1580 . 10.1086/116537 . 1993AJ....105.1571H.
• Henry . Todd J. . The Solar Neighborhood. X. New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs . 2004 . . 128 . 5 . 2460–2473 . astro-ph/0408240 . 10.1086/425052 . 2004AJ....128.2460H. Subasavage . John P. . Brown . Misty A. . Beaulieu . Thomas D. . Jao . Wei-Chun . Hambly . Nigel C. . 15759789 .
• Smart . R. L. . Ioannidis . G. . Jones . H. R. A. . Bucciarelli . B. . Lattanzi . M. G. . Cool dwarfs stars from the Torino Observatory Parallax Program . 2010 . . 514 . A84 . 1003.1465 . 10.1051/0004-6361/200913424 . 2010A&A...514A..84S. 17961025 .
• Dittmann . Jason A. . Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs . 2014 . . 784 . 2 . 156 . 1312.3241 . 10.1088/0004-637X/784/2/156 . 2014ApJ...784..156D. Irwin . Jonathan M. . Charbonneau . David . Berta-Thompson . Zachory K. . 18789867 . Table with parallaxes.

External links

• 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