Nu Cygni
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 57m 10.41907s |
| Declination | +41° 10′ 01.6991″ |
| Apparent magnitude (V) | 3.94 |
| Characteristics | |
| Spectral type | A0III n |
| U−B color index | +0.00 |
| B−V color index | +0.02 |
| Astrometry | |
| Radial velocity (Rv) | −27.60 km/s |
| Proper motion (μ) | RA: +9.64 mas/yr Dec.: −22.75 mas/yr |
| Parallax (π) | 8.71±0.34 mas |
| Distance | 370 ± 10 ly (115 ± 4 pc) |
| Absolute magnitude (MV) | −1.36 |
| Details | |
| ν Cyg A | |
| Mass | 3.62±0.08 M☉ |
| Radius | 7.55 R☉ |
| Luminosity | 412 L☉ |
| Temperature | 9,462 K |
| Rotational velocity (v sin i) | 217 km/s |
| Other designations | |
| ν Cyg, 58 Cyg, BD+40°4364, GC 29251, HD 199629, HIP 103413, HR 8028, SAO 50274, WDS J20572+4110AB | |
| Database references | |
| SIMBAD | data |
Nu Cygni, Latinized from ν Cygni, is a binary star system in the constellation Cygnus. Its apparent magnitude is 3.94 and it is approximately 374 light years away based on parallax. The brighter component is a magnitude 4.07 A-type giant star with a stellar classification of A0III n, where the 'n' indicates broad "nebulous" absorption lines due to rapid rotation. This white-hued star has an estimated 3.6 times the mass of the Sun and about 7.55 times the Sun's radius. It is radiating 412 times the Sun's luminosity from its photosphere at an effective temperature of 9,462 K. The magnitude 6.4 companion has an angular separation of 0.24" from the primary.