| 词条 | HD 139357 |
| 释义 |
| name = HD 139357 }}{{Starbox observe | epoch = J2000.0 | constell = Draco | ra = {{RA|15|35|16.20}}[1] | dec = {{DEC|+53|55|19.7}}[1] | appmag_v = 5.977 }}{{Starbox character | class = K4III | r-i = | v-r = | b-v = 1.191 | u-b = | variable = }}{{Starbox astrometry | radial_v = –8.75 ± 0.39 | prop_mo_ra = -18.32 ± 0.30[1] | prop_mo_dec = 1.64 ± 0.33[1] | parallax = 8.47 | p_error = 0.30 | parallax_footnote = [1] | absmag_v = 0.557 }}{{Starbox detail | mass = 1.35 ± 0.24 | radius = 11.47 ± 0.75 | gravity = 1.51 | luminosity = 57.4 | temperature = 4700 ± 70 | metal = –0.13 ± 0.05 | age_gyr = 3.07 ± 1.47 | rotation = }}{{Starbox catalog | names = BD+54° 1756, GC 20977, GCRV 9003, HIP 76311, HR 5811, PPM 35043, SAO 29583 }}{{Starbox reference | Simbad = HD+139357 | NSTED = HD+139357 | EPE = HD+139357 }}{{Starbox end}} HD 139357 is a 6th magnitude K-type giant star located approximately 390 light years from Earth, visible in the constellation Draco. Its mass is four thirds that of our Sun but its radius is 11.47 times larger. However, despite being a giant star, it is only 3.07 billion years old, which is younger than our Sun. It hosts a planet discovered in 2009. {{OrbitboxPlanet begin| table_ref = }}{{OrbitboxPlanet | exoplanet = b | mass = ≥9.76 ± 2.15 | period = 1125.7 ± 9 | semimajor = 2.36 ± 0.02 | eccentricity = 0.10 ± 0.02 }}{{Orbitbox end}} See also
References1. ^1 2 3 4 5 {{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }} Vizier catalog entry [1]}}{{Sky|15|35|16.1992|+|53|55|19.717|396}}{{Stars of Draco}}{{giant-star-stub}}{{extrasolar-planet-stub}} 7 : K-type giants|Henry Draper Catalogue objects|Hipparcos objects|HR objects|Draco (constellation)|Planetary systems|Durchmusterung objects |
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