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KIC 8462852
KIC 8462852〔 – eponymously Tabby's star (after lead author Tabetha S. Boyajian) or WTF star (formally for "Where's The Flux?",〔 but also a reference to an expression of disbelief) – is an F-type main-sequence star located in the constellation Cygnus approximately from Earth. Unusual light fluctuations of the star were discovered by citizen scientists as part of the Planet Hunters project, and in September 2015 astronomers and citizen scientists associated with the project posted a preprint of a paper on arXiv describing the data and possible interpretations.〔 The discovery was made from data collected by the ''Kepler'' space telescope,〔〔 which observes changes in the brightness of distant stars in order to detect exoplanets.
Several hypotheses have been proposed to explain the star's large irregular changes in brightness as measured by its unusual light curve. The leading hypothesis, based on a lack of observed infrared light, is that of a swarm of cold, dusty comet fragments in a highly eccentric orbit. Many small masses in "tight formation" orbiting the star have also been proposed.〔 It has been suggested that the changes in brightness could be signs of activity associated with intelligent extraterrestrial life.〔 The SETI Institute's initial radio reconnaissance of KIC 8462852, however, found no evidence of technology-related radio signals from the star.
==Apparent location==
KIC 8462852 in Cygnus〔(【引用サイトリンク】title=KIC10 Search Results )〕 is located roughly halfway between the major visually apparent bright stars Deneb (α Cyg, α Cygni, Alpha Cygni) and Rukh (δ Cyg, δ Cygni, Delta Cygni) to the eye as part of the Northern Cross. KIC 8462852 is situated south of Omicron¹ Cygni (ο¹ Cygni, 31 Cygni), and northeast of the star cluster NGC 6866.〔 While only a few arcminutes away from the cluster, it is unrelated and closer to the Sun than it is to the star cluster. With an apparent magnitude of 11.7, the star cannot be seen by the naked eye, but is visible with a telescope in a dark sky with little light pollution.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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