| 词条 | Kepler-12 |
| 释义 |
| name = Kepler-12 }}{{Starbox observe | constell = Cygnus | epoch = J2000 | ra = {{RA|19|04|58.4221}}[1] | dec = {{DEC|+50|02|25.271}}[1] | appmag_v = 13.4[1] }}{{Starbox astrometry | prop_mo_ra = {{val|3.053|0.025}}[1] | prop_mo_dec = {{val|3.235|0.024}}[1] | parallax = 1.1057 | p_error = 0.0125 | parallax_footnote = [1] }}{{Starbox character | class = G0[1] }}{{Starbox detail | source = [1] | mass = {{val|1.166|0.054}} | radius = {{val|1.483|0.029}} | temperature = {{val|5947|100}} | age_gyr = {{val|4.0|0.4}} | metal_fe = 0.07 (± 0.04) | rotational_velocity = {{val|2.7|0.5}}[2] }}{{Starbox catalog | names = KIC 11804465, KOI-20, GSC 03549-00844, 2MASS J19045842+5002253[2] }}{{Starbox reference | Simbad = Kepler-12 | KIC = 11804465 }}{{Starbox end}} Kepler-12 is a star with a transiting planet Kepler-12b in a 4-day orbit. CharacteristicsKepler-12, known also as KIC 11804465 in the Kepler Input Catalog, is an early G-type to late F-type star. This corresponds strongly with a sunlike dwarf star nearing the end of the main sequence, and is about to become a red giant.[11] Kepler-12 is located approximately 900 parsecs (2,950 light years) away from Earth. The star also has an apparent magnitude of 13.438, which means that it cannot be seen from Earth with the unaided eye.[1] The star is slightly more massive, slightly more iron-rich and slightly hotter than the Sun. However, Kepler-12 is larger, with a radius of 1.483 times the Sun's radius.[1] Planetary systemThe one currently known planet is a hot Jupiter with a radius 1.7 times that of Jupiter but less than half the mass. {{OrbitboxPlanet begin| table_ref = [11] }}{{OrbitboxPlanet | exoplanet = b | mass = {{val|0.432|0.053|0.051}} | semimajor = {{val|0.0553|0.0010|0.0012}} | period = {{val|4.4379637|0.0000002}} | eccentricity = 0 | inclination = {{val|88.796|0.088|0.074}} | radius = {{val|1.754|0.031|0.036}} }}{{Orbitbox end}} References1. ^1 2 3 4 {{cite web|title=Notes on Kepler-12 b|url=http://exoplanet.eu/catalog/kepler-12_b/|accessdate=29 December 2016}} [3][4]2. ^1 {{cite simbad|title=Kepler-12|accessdate=29 December 2016}} 3. ^1 2 {{cite journal | title=Discovery and Atmospheric Characterization of Giant Planet Kepler-12b: An Inflated Radius Outlier | url=http://iopscience.iop.org/article/10.1088/0067-0049/197/1/9/meta | last1=Fortney | first1=Jonathan J. | last2=Demory | first2=Brice-Olivier | last3=Désert | first3=Jean-Michel | last4=Rowe | first4=Jason | last5=Marcy | first5=Geoffrey W. | last6=Isaacson | first6=Howard | last7=Buchhave | first7=Lars A. | last8=Ciardi | first8=David | last9=Gautier | first9=Thomas N. | last10=Batalha | first10=Natalie M. | last11=Caldwell | first11=Douglas A. | last12=Bryson | first12=Stephen T. | last13=Nutzman | first13=Philip | last14=Jenkins | first14=Jon M. | last15=Howard | first15=Andrew | last16=Charbonneau | first16=David | last17=Knutson | first17=Heather A. | last18=Howell | first18=Steve B. | last19=Everett | first19=Mark | last20=Fressin | first20=François | last21=Deming | first21=Drake | last22=Borucki | first22=William J. | last23=Brown | first23=Timothy M. | last24=Ford | first24=Eric B. | last25=Gilliland | first25=Ronald L. | last26=Latham | first26=David W. | last27=Miller | first27=Neil | last28=Seager | first28=Sara | last29=Fischer | first29=Debra A. | last30=Koch | first30=David | display-authors=1 | journal=The Astrophysical Journal Supplement Series | volume=197 | at=9 | year=2011 | arxiv=1109.1611 | bibcode=2011ApJS..197....9F | doi=10.1088/0067-0049/197/1/9 }} 4. ^1 2 3 4 5 {{cite DR2}} Gaia Data Release 2 catalog entry }}{{Stars of Draco}}{{Sky|19|04|58|+|50|02|25}}{{extrasolar-planet-stub}}{{main-star-stub}} 5 : Draco (constellation)|G-type main-sequence stars|Planetary systems|Planetary transit variables|Kepler Objects of Interest |
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