| 翻訳と辞書 |
PH1b
PH1b (standing for "Planet Hunters 1"), or by its NASA designation Kepler-64b,〔http://www.nasa.gov/mission_pages/kepler/news/keplerm-20121026.html〕 is an extrasolar planet found in a circumbinary orbit in the quadruple star system Kepler-64. The planet was discovered by two amateur astronomers from the Planet Hunters project of amateur astronomers using data from the Kepler space telescope with assistance of a Yale University team of international astronomers. The discovery was announced on 15 October 2012.〔Voice of America, ("Citizen Astronomers Discover Planet with Four Suns" ), ''16 October 2012''〕〔Yahoo News, ("Planet with four suns discovered" ), Press Association, ''15 October 2012'' (accessed 20 October 2012)〕 It is the first known transiting planet in a quadruple star system,〔 first known circumbinary planet in a quadruple star system,〔NASA JPL, ("Citizens Discover Four-Star Planet with NASA's Kepler" ), Whitney Clavin, ''15 October 2012'' (accessed 20 October 2012)〕 and the first planet in a quadruple star system found. It was the first confirmed planet discovered by PlanetHunters.org.〔PlanetHunters.org, ("PH1 : A planet in a four-star system" ), ''15 October 2012'' (accessed 20 October 2012)〕
==Star system==
The giant planet is Neptune-sized, about 20-55 Earth-masses (). It has a radius 6.2 times that of Earth's. The star system is 5000 light years from Earth.〔〔ABC News (Australia), ("Astronomers discover planet with four suns" ), AFP, ''17 October 2012'' (accessed 20 October 2012)〕〔〔KSDK-TV, ('Planet Hunters' discover new planet, PH-1 ), CNN, ''15 October 2012'' (accessed 20 October 2012)〕 The planet orbits a close binary, with a more distant binary orbiting at a distance, forming the quadruple star system. The star system has the Kepler Input Catalogue name KIC 4862625 as well as the designation Kepler-64. The close binary (Aa+Ab) that the planet circles has an orbital period of 20 days. They form an eclipsing binary pair.〔 The two stars are (Aa) 1.5 solar mass () F-type main-sequence star and (Ab) red dwarf.〔arXiv. "Planet Hunters: A Transiting Circumbinary Planet in a Quadruple Star System", ''Megan E. Schwamb, Jerome A. Orosz, Joshua A. Carter, William F. Welsh, Debra A. Fischer, Guillermo Torres, Andrew W. Howard, Justin R. Crepp, William C. Keel, Chris J. Lintott, Nathan A. Kaib, Dirk Terrell, Robert Gagliano, Kian J. Jek, Michael Parrish, Arfon M. Smith, Stuart Lynn, Robert J. Simpson, Matthew J. Giguere, Kevin Schawinski'', 2012 October, ; ;〕〔〔SpaceRef, ("Planet Hunters: A Transiting Circumbinary Planet in a Quadruple Star System" ), ''14 October 2012'' (accessed 20 October 2012)〕 The planet orbits this binary pair in a 138.3-day orbit. The binary pairs have a separation of 1000 AUs.〔 A photometric-dynamical model was used to model the planetary system of the close binary pair. The distant binary (Ba+Bb) have a pair separation of 60 AU. The two stars are (Ba) G-type main-sequence star and (Bb) red dwarf. The quadruple star system has an estimated age of 2 gigayears.〔 The system is located at right ascension declination , so also has a 2MASS catalogue entry of ''2MASS 19525162+3957183''〔Kepler Catalogue, KIC 4862625 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「PH1b」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|