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Star in the constellation Cygnus From Wikipedia, the free encyclopedia
Nu Cygni, Latinized from ν Cygni, is a binary star[9] system in the constellation Cygnus. Its apparent magnitude is 3.94[2] and it is approximately 374 light years away based on parallax.[1] The brighter component is a magnitude 4.07 A-type giant star with a stellar classification of A0III n,[3] where the 'n' indicates broad "nebulous" absorption lines due to rapid rotation. This white-hued star has an estimated 3.6[6] times the mass of the Sun and about 1.9[7] times the Sun's radius. It is radiating 412[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,462 K.[6] The magnitude 6.4 companion has an angular separation of 0.24" from the primary.[9]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 57m 10.41907s[1] |
Declination | 41° 10′ 01.6991″[1] |
Apparent magnitude (V) | 3.94 [2] |
Characteristics | |
Spectral type | A0III n[3] |
U−B color index | +0.00[2] |
B−V color index | +0.02[2] |
Astrometry | |
Radial velocity (Rv) | −27.60[4] km/s |
Proper motion (μ) | RA: +9.64[1] mas/yr Dec.: −22.75[1] mas/yr |
Parallax (π) | 8.71 ± 0.34 mas[1] |
Distance | 370 ± 10 ly (115 ± 4 pc) |
Absolute magnitude (MV) | −1.36[5] |
Details | |
ν Cyg A | |
Mass | 3.62±0.08[6] M☉ |
Radius | 1.90[7] R☉ |
Luminosity | 412[6] L☉ |
Temperature | 9,462[6] K |
Rotational velocity (v sin i) | 217[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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