HD 139777

小熊座π1是在拱極星座小熊座北部的共同自行聯星。該對的視星等分別為+6.58和+7.31，綜合星等為+6.1。它們位於距離太陽約71光年的地方。兩星的角距離為31.4弧秒，其對應於實際約680AU，並以大約13,100年的週期互繞著彼此運行。 這兩顆恆星都是類太陽恆星，並已被列為天琴-武仙星協的可能成員，該星協是距離太陽最近的移動星群之一，然而現在認為這不太可能。 主星小熊座π1 A，質量比太陽高2%，表面有效溫度為7003577100000000000♠5,771 K，半徑為太陽的的98%和輻射熱光度為太陽的93%。伴星，小熊座π1 B，質量是太陽的92%，溫度略低為7003540800000000000♠5,408 K，半徑是太陽的 84%，光度略高於太陽的一半。 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.  Johnson, Harold L., Photoelectric Observations of Visual Double Stars., Astrophysical Journal, May 1953, 117: 361, Bibcode:1953ApJ...117..361J, doi:10.1086/145700.  Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, S2CID 119476992, arXiv:astro-ph/0603770 , doi:10.1086/504637.  Abt, H. A., Visual multiples. VII - MK classifications, The Astrophysical Journal Supplement Series, 1981, 45: 437, Bibcode:1981ApJS...45..437A, doi:10.1086/190719.  de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, S2CID 59451347, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.  Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051.  VizieR中此天体在盖亚望远镜第二批数据发布的记录 Porto de Mello, G. F.; et al, A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun; I. Atmospheric parameters and color similarity to the Sun, Astronomy and Astrophysics, March 2014, 563: A52, Bibcode:2014A&A...563A..52P, S2CID 119111150, arXiv:1312.7571 , doi:10.1051/0004-6361/201322277.  Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051.  VizieR中此天体在盖亚望远镜第二批数据发布的记录 Tokovinin, Andrei, From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs, The Astronomical Journal, 2014, 147 (4): 14, Bibcode:2014AJ....147...87T, S2CID 56066740, arXiv:1401.6827 , doi:10.1088/0004-6256/147/4/87, 87.  Mishenina, T. V.; et al, Abundances of neutron-capture elements in stars of the Galactic disk substructures, Astronomy & Astrophysics, April 2013, 552: 12, Bibcode:2013A&A...552A.128M, S2CID 119268097, arXiv:1303.1730 , doi:10.1051/0004-6361/201220687, A128.  Casagrande, L.; et al, New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey, Astronomy & Astrophysics, 2011, 530 (A138): 21, Bibcode:2011A&A...530A.138C, S2CID 56118016, arXiv:1103.4651 , doi:10.1051/0004-6361/201016276.  Pace, G., Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram, Astronomy & Astrophysics, March 2013, 551: 4, Bibcode:2013A&A...551L...8P, S2CID 56420519, arXiv:1301.5651 , doi:10.1051/0004-6361/201220364, L8.  ** STF 1972AB. SIMBAD. 斯特拉斯堡天文資料中心. [2017-06-26].  HD 139777 -- High proper-motion Star （页面存档备份，存于互联网档案馆） HD 139813 -- High proper-motion Star （页面存档备份，存于互联网档案馆） Kepple, George Robert; Sanner, Glen W., The Night Sky Observers Guide: Spring & summer 2, Willmann-Bell: 418, 1998, ISBN 0943396603.  Lépine, Sébastien; Bongiorno, Bethany, New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems, The Astronomical Journal, March 2007, 133 (3): 889–905, Bibcode:2007AJ....133..889L, S2CID 16800796, arXiv:astro-ph/0610605 , doi:10.1086/510333.  Eisenbeiss, T.; et al, The Hercules-Lyra association revisited. New age estimation and multiplicity study (PDF), Astronomy & Astrophysics, August 2013, 556: 19, Bibcode:2013A&A...556A..53E, S2CID 119275785, arXiv:1312.4045 , doi:10.1051/0004-6361/201118362, A53. [永久失效連結] Lopez-Santiago, J.; Montes, D.; Crespo-Chacon, I.; Fernandez-Figueroa, M. J., The Nearest Young Moving Groups, The Astrophysical Journal, 2006, 643 (2): 1160–1165, Bibcode:2006ApJ...643.1160L, S2CID 119520529, arXiv:astro-ph/0601573 , doi:10.1086/503183.  The Electronic Sky （页面存档备份，存于互联网档案馆） University of Florida Astronomy Department HR 1971 （页面存档备份，存于互联网档案馆） Image Omicron Aurigae