Theta Cygni

θ Cygni
Location of θ Cygni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 36m 26.53436s[1]
Declination +50° 13′ 15.9646″[1]
Apparent magnitude (V) 4.490[2]/13.03[3]
Characteristics
Spectral type F3 V[4] + M3 V[5]
U−B color index –0.03[6]
B−V color index +0.38[6]
Astrometry
Radial velocity (Rv)–27.4[2] km/s
Proper motion (μ) RA: –8.87[1] mas/yr
Dec.: +262.45[1] mas/yr
Parallax (π)54.54 ± 0.15 mas[1]
Distance59.8 ± 0.2 ly
(18.34 ± 0.05 pc)
Absolute magnitude (MV)3.14[2]
Details
θ Cyg A
Mass1.4±0.02[7] M☉
Radius1.462±0.013[7] R☉
Luminosity4.232±0.035[7] L☉
Surface gravity (log g)4.254±0.01[7] cgs
Temperature6853±29[7] K
Metallicity [Fe/H]−0.02±0.06[8] dex
Rotational velocity (v sin i)7[9] km/s
Age1.0 - 1.6[8] Gyr
θ Cyg B
Mass0.35[10] M☉
Radius0.36[8] R☉
Luminosity0.01[8] L☉
Temperature3,000 - 3,500[8] K
GSC 03564-00642
Radius0.28[8] R☉
Luminosity0.013[8] L☉
Temperature3,700[8] K
Other designations
13 Cyg, θ Cyg, BD+49 3062, GJ 765, HD 185395, HR 7469, SAO 31815, HIP 96441
B: 2MASS 19362771+5013419, KIC 11918644
GJ 765B: 2MASS 19362286+5013034, KIC 11918614
GSC 03564-00642: 2MASS J19361440+5013096, KIC 11918550
Database references
SIMBADθ Cygni
θ Cygni B
θ Cygni C
θ Cygni D
GJ 765B
GSC 03564-00642

Theta Cygni (θ Cygni, θ Cyg) is a star in the northern constellation of Cygnus. It has an apparent visual magnitude of 4.5, so it can be seen with the naked eye in sufficiently dark skies. Based upon parallax measurements, it is at a distance of about 59.8 light-years (18.3 parsecs) from the Earth. It is suspected of hosting an extrasolar planet.

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