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KIC 8462852
Observation data EpochJ2000.0EquinoxJ2000.0 (ICRS)
Constellation	Cygnus
Right ascension	20^h 06^m 15.4527^s
Declination	+44° 27′ 24.791″
Apparent magnitude(V)	+11.705±0.017
Characteristics
Evolutionary stage	Main sequence^[1]
Spectral type	F3V
B−V color index	0.557
V−R color index	0.349
R−I color index	0.305
J−H color index	0.212
J−K color index	0.264
Astrometry
Proper motion(μ)	RA:−10.422±0.040mas/yr Dec.:−10.288±0.041mas/yr
Parallax(π)	2.2185 ± 0.0243^[2]mas
Distance	1,470 ± 20 ly (451 ± 5 pc)
Absolute magnitude(M_V)	3.08^[1]^[3]
Details
Mass	1.43^[1]`M`_☉
Radius	1.58^[1]`R`_☉
Luminosity (bolometric)	4.68^[1]`L`_☉
Surface gravity(log g)	4.0±0.2^[4]cgs
Temperature	6750±120^[1]K
Metallicity	0.0±0.1^[1]
Rotation	0.8797±0.0001 days^[1]
Rotational velocity(v sin i)	84±4^[1] km/s
Other designations
Tabby's Star, Boyajian's Star, WTF Star, TYC 3162-665-1,^[1]2MASS J20061546+4427248,^[1]LGM-2^[5]
Database references
SIMBAD	data
KIC	data

KIC 8462852^[1] (also Tabby's Star or Boyajian's Star or WTF Star) is an F-type main-sequence star located in the constellationCygnus approximately 1,470 light-years (450 pc) from Earth.^[2] Unusual light fluctuations of the star, including up to a 22% dimming in brightness, were discovered by citizen scientists as part of the Planet Hunters project. In September 2015, astronomers and citizen scientists associated with the project posted a preprint of an article describing the data and possible interpretations.^[1] The discovery was made from data collected by the Kepler space telescope,^[1]^[6] which observed changes in the brightness of distant stars to detect exoplanets.^[7]

Several hypotheses have been proposed to explain the star's large irregular changes in brightness as measured by its light curve, but none to date fully explain all aspects of the curve. One explanation is that an 'uneven ring of dust' orbits KIC 8462852.^[8]^[9]^[10]^[11]^[12]^[13] In another explanation, the star's luminosity is modulated by changes in the efficiency of heat transport to its photosphere, so no external obscuration is required.^[14] A third hypothesis, based on a lack of observed infrared light, posits a swarm of cold, dusty comet fragments in a highly eccentric orbit,^[15]^[16]^[17] however, the notion that disturbed comets from such a cloud could exist in high enough numbers to obscure 22% of the star's observed luminosity has been doubted.^[18] Another hypothesis is that a large number of small masses in 'tight formation' are orbiting the star.^[6] Furthermore, spectroscopic study of the system has found no evidence for coalescing material or hot close-in dust or circumstellar matter from an evaporating or exploding planet within a few astronomical units of the mature central star.^[15]^[19] It has also been hypothesized that the changes in brightness could be signs of activity associated with intelligent extraterrestrial life constructing a Dyson swarm; however, further analysis based on data through the end of 2017 showed wavelength-dependent dimming consistent with dust but not an opaque object such as an alien megastructure, which would block all wavelengths of light equally.^[6]^[20]^[12]^[11]

KIC 8462852 is not the only star that has large irregular dimmings, but all other such stars are young stellar objects called YSO dippers, which have different dimming patterns. An example of such an object is EPIC 204278916.^[21]^[22]

New light fluctuation events of KIC 8462852 began in the middle of May 2017.^[12] Except for a period between late-December 2017 and mid-February 2018 when the star was obscured by the Sun, the fluctuations have been observed to have continued as of July 2018.

5Hypotheses
6Follow-up studies

Nomenclature[edit]

KIC is an acronym for the Kepler Input Catalog, 8462852 being the star's catalog number. Colloquially the names 'Tabby's Star' and 'Boyajian's Star' refer to the initial study's lead author, Tabetha S. Boyajian;^[23]^[24] KIC 8462852 is sometimes called the 'WTF Star', after the study's subtitle 'Where's The Flux?'^[25]^[26]^[27]^[28] (a joking reference to the colloquial expression of disbelief 'WTF').^[29]

Location[edit]

Map showing location of NGC 6866. KIC 8462852 is northeast between NGC 6866 and ο¹ Cygni.

Finder image: KIC 8462852 (blue square) and nearby stars - stable reference stars are in red circles.(FOV=12.5 x 9.6 'arc, NE at upper-left)^[30]

KIC 8462852 in the constellation Cygnus is located roughly halfway between the bright stars Deneb and Delta Cygni as part of the Northern Cross.^[31]^[32] KIC 8462852 is situated south of 31 Cygni, and northeast of the star clusterNGC 6866.^[32] 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 5-inch (130 mm) telescope^[33] in a dark sky with little light pollution.

History of observations[edit]

KIC 8462852 was observed as early as the year 1890.^[34]^[35]^[36] The star was cataloged in the Tycho, 2MASS, UCAC4, and WISEastronomical catalogs^[37] (published in 1997, 2003, 2009, and 2012, respectively).^[38]^[39]^[40]^[41]

The main source of information about the luminosity fluctuations of KIC 8462852 is the Kepler space observatory. During its primary and extended mission from 2009 to 2013 it continuously monitored the light curves of over 100,000 stars in a patch of sky in the constellations Cygnus and Lyra.^[42]

Luminosity[edit]

Observations of the luminosity of the star by the Kep

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