Binary star in the constellation Cygnus
35 Cygni Location of 35 Cyg (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Cygnus Right ascension 20h 18m 39.06986s [ 1] Declination +34° 58′ 57.9909″[ 1] Apparent magnitude (V)5.18[ 2] Characteristics Spectral type F6Ib[ 3] B−Vcolor index +0.62[ 2] Astrometry Radial velocity (Rv )−20.20[ 4] km/s Proper motion (μ)RA: −0.05[ 1] mas /yr Dec.: −3.77[ 1] mas /yr Parallax (π)1.03± 0.21 mas [ 1] Distance approx. 3,200 ly pc ) Absolute magnitude (MV )−3.99[ 5] Details Mass 10.0[ 6] M ☉ Radius 51[ 7] R ☉ Luminosity 7,093[ 8] L ☉ Surface gravity (log g )1.5[ 6] [ 5] cgs Temperature 6,360[ 5] K Metallicity [Fe/H] 0.02[ 5] dex Rotational velocity (v sin i )3.5[ 6] Age 22[ 9] Myr Other designations 35 Cyg,HR 7770,BD +34°3967,HD 193370,SAO 69806,FK5 3627,HIP 100122Database references SIMBAD data
35 Cygni is aspectroscopic binary star in theconstellation Cygnus . Itsapparent magnitude is 5.18. Located around 1,000 parsecs (3,300 ly) distant, its primary is ayellow supergiant of spectral type F6Ib, a massive star that has used up its corehydrogen and is now fusing heavier elements.
Yellow supergiants are usually variable, oftenClassical Cepheid variables , but 35 Cyg is notable for having an especially constant brightness.[ 10]
35 Cyg is a single-lined spectroscopic binary with a period of 2,440 days (over 6 years).[ 11] [ 12]
It was once designatedm Cygni byJohn Flamsteed and was included in his Atlas Coelestis, but the designation is now dropped.[ 13]
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