35 Cygni is a spectroscopic binary star in the constellation Cygnus. Its apparent magnitude is 5.18. Located around 1,000 parsecs (3,300 ly) distant, its primary is a yellow supergiant of spectral type F6Ib, a massive star that has used up its core hydrogen and is now fusing heavier elements.
Observation data Epoch 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−V color 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 (approx. 1,000 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] - 2.4[5] cgs |
Temperature | 6,360[5] K |
Metallicity [Fe/H] | 0.02[5] dex |
Rotational velocity (v sin i) | 3.5[6] km/s |
Age | 22[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Yellow supergiants are usually variable, often Classical 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] The secondary cannot be seen directly, nor can its spectral lines be identified but the overall spectrum can be match by a combination of an F4 supergiant and a less luminous B6.5 star.[12]