Tabby's Star (designated as KIC 8462852 in the Kepler Input Catalog and also known by the names Boyajian's Star and WTF Star) is a binary star in the constellation Cygnus approximately 1,470 light-years (450 parsecs) from Earth. The system is composed of an F-type main-sequence star and a red dwarf companion. ____________________________________ Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Cygnus Right ascension 20h 06m 15.45265s[1] Declination +44° 27′ 24.7909″[1] Apparent magnitude (V) +11.705±0.017[2] Characteristics KIC 8462852 A Evolutionary stage Main sequence[2] Spectral type F3V[2] 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 KIC 8462852 B Spectral type M2V[3] Astrometry KIC 8462852 A Radial velocity (Rv) −0.46±3.91[1] km/s Proper motion (μ) RA: −10.375±0.012 mas/yr[1] Dec.: −10.273±0.011 mas/yr[1] Parallax (π) 2.2545 ± 0.0099 mas[1] Distance 1,447 ± 6 ly (444 ± 2 pc) Absolute magnitude (MV) 3.08[2][4] KIC 8462852 B Proper motion (μ) RA: −10.097±0.231 mas/yr[5] Dec.: −10.610±0.254 mas/yr[5] Parallax (π) 2.2470 ± 0.1620 mas[5] Distance 1,500 ± 100 ly (450 ± 30 pc) Position (relative to Tabby's Star)[3] Component KIC 8462852 B Epoch of observation 2019 Angular distance 1951.88±0.06 mas Position angle 96.062±0.004° Projected separation 880±10 AU Details KIC 8462852 A Mass 1.43[2] M☉ Radius 1.58[2] R☉ Luminosity (bolometric) 4.68[2] L☉ Surface gravity (log g) 4.0±0.2[6] cgs Temperature 6750±120[2] K Metallicity 0.0±0.1[2] Rotation 0.8797±0.0001 days[2] Rotational velocity (v sin i) 84±4[2] km/s KIC 8462852 B Mass 0.44±0.02[3] M☉ Radius 0.45±0.02[3] R☉ Temperature 3720±70[3] K
Tabby's Star (designated as KIC 8462852 in the Kepler Input Catalog and also known by the names Boyajian's Star and WTF Star) is a binary star in the constellation Cygnus approximately 1,470 light-years (450 parsecs) from Earth. The system is composed of an F-type main-sequence star and a red dwarf companion.
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Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Cygnus
Right ascension
20h 06m 15.45265s[1]
Declination
+44° 27′ 24.7909″[1]
Apparent magnitude (V)
+11.705±0.017[2]
Characteristics
KIC 8462852 A
Evolutionary stage
Main sequence[2]
Spectral type
F3V[2]
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
KIC 8462852 B
Spectral type
M2V[3]
Astrometry
KIC 8462852 A
Radial velocity (Rv)
−0.46±3.91[1] km/s
Proper motion (μ)
RA: −10.375±0.012 mas/yr[1]
Dec.: −10.273±0.011 mas/yr[1]
Parallax (π)
2.2545 ± 0.0099 mas[1]
Distance
1,447 ± 6 ly
(444 ± 2 pc)
Absolute magnitude (MV)
3.08[2][4]
KIC 8462852 B
Proper motion (μ)
RA: −10.097±0.231 mas/yr[5]
Dec.: −10.610±0.254 mas/yr[5]
Parallax (π)
2.2470 ± 0.1620 mas[5]
Distance
1,500 ± 100 ly
(450 ± 30 pc)
Position (relative to Tabby's Star)[3]
Component
KIC 8462852 B
Epoch of observation
2019
Angular distance
1951.88±0.06 mas
Position angle
96.062±0.004°
Projected separation
880±10 AU
Details
KIC 8462852 A
Mass
1.43[2] M☉
Radius
1.58[2] R☉
Luminosity (bolometric)
4.68[2] L☉
Surface gravity (log g)
4.0±0.2[6] cgs
Temperature
6750±120[2] K
Metallicity
0.0±0.1[2]
Rotation
0.8797±0.0001 days[2]
Rotational velocity (v sin i)
84±4[2] km/s
KIC 8462852 B
Mass
0.44±0.02[3] M☉
Radius
0.45±0.02[3] R☉
Temperature
3720±70[3] K
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