16 Cygni
16 Cygni or 16 Cyg is the Flamsteed designation of a triple star system approximately 69 light-years away from Earth in the constellation of Cygnus. It consists of two Sun-like yellow dwarf stars, 16 Cygni A and 16 Cygni B, together with a red dwarf, 16 Cygni C. In 1996 an extrasolar planet was discovered in an eccentric orbit around 16 Cygni B.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| 16 Cygni A | |
| Right ascension | 19h 41m 48.9535s |
| Declination | +50° 31′ 30.220″ |
| Apparent magnitude (V) | 5.96 |
| 16 Cygni B | |
| Right ascension | 19h 41m 51.9727s |
| Declination | +50° 31′ 03.089″ |
| Apparent magnitude (V) | 6.20 |
| Characteristics | |
| Spectral type | G1.5Vb / G2.5Vb / M?V |
| U−B color index | 0.19 / 0.20 |
| B−V color index | 0.64 / 0.66 |
| Variable type | None |
| Astrometry | |
| 16 Cyg A | |
| Radial velocity (Rv) | −27.31(13) km/s |
| Proper motion (μ) | RA: −148.034(28) mas/yr Dec.: −159.030(28) mas/yr |
| Parallax (π) | 47.3239 ± 0.0197 mas |
| Distance | 68.92 ± 0.03 ly (21.131 ± 0.009 pc) |
| Absolute magnitude (MV) | 4.29 |
| 16 Cyg B | |
| Radial velocity (Rv) | −27.87(12) km/s |
| Proper motion (μ) | RA: −134.482(18) mas/yr Dec.: −162.698(27) mas/yr |
| Parallax (π) | 47.3302 ± 0.0171 mas |
| Distance | 68.91 ± 0.02 ly (21.128 ± 0.008 pc) |
| Absolute magnitude (MV) | 4.53 |
| Details | |
| 16 Cyg A | |
| Mass | 1.08±0.02 M☉ |
| Radius | 1.229±0.008 R☉ |
| Luminosity | 1.55±0.07 L☉ |
| Surface gravity (log g) | 4.292±0.003 cgs |
| Temperature | 5,830 ± 11 K |
| Metallicity [Fe/H] | 0.101 ± 0.008 dex |
| Rotation | 23.8+1.5 −1.8 d |
| Rotational velocity (v sin i) | 2.23 ± 0.07 km/s |
| Age | 7.07±0.26 Gyr |
| 16 Cyg B | |
| Mass | 1.04±0.02 M☉ |
| Radius | 1.116±0.006 R☉ |
| Luminosity | 1.25±0.05 L☉ |
| Surface gravity (log g) | 4.359±0.002 cgs |
| Temperature | 5,751 ± 11 K |
| Metallicity [Fe/H] | 0.054 ± 0.008 dex |
| Rotation | 23.2+11.5 −3.2 d |
| Rotational velocity (v sin i) | 1.35 ± 0.08 km/s |
| Age | 6.74±0.24 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| A data2 | |
| B data3 | |
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