P Cygni
Variable star in the constellation Cygnus / From Wikipedia, the free encyclopedia
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P Cygni (34 Cygni) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in Uranometria as a nova. Located about 5,300 light-years (1,560 parsecs) from Earth, it is a hypergiant luminous blue variable (LBV) star of spectral type B1-2 Ia-0ep that is one of the most luminous stars in the Milky Way.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 17m 47.2020s[1] |
Declination | +38° 01′ 58.549″[1] |
Apparent magnitude (V) | 4.82[2] (3 to 6[3]) |
Characteristics | |
Spectral type | B1-2 Ia-0ep[4] (B1 Iapeq[3]) |
U−B color index | −0.58[5] |
B−V color index | +0.42[5] |
Variable type | LBV[3] |
Astrometry | |
Radial velocity (Rv) | −8.9[6] km/s |
Proper motion (μ) | RA: −3.723[1] mas/yr Dec.: −6.798[1] mas/yr |
Parallax (π) | 0.6251 ± 0.0729 mas[1] |
Distance | 1,610±180[7] pc |
Absolute magnitude (MV) | −7.9[8] |
Details | |
Mass | 37[9] M☉ |
Radius | 76[10] R☉ |
Luminosity | 610,000[10] L☉ |
Surface gravity (log g) | 2.25[9] cgs |
Temperature | 18,700[10] K |
Metallicity | 0.29[10] He/H |
Rotational velocity (v sin i) | 35[11] km/s |
Other designations | |
Nova Cyg 1600, 34 Cyg, JP11 3218, TD1 26474, GSC 03151-03442, TYC 3151-3442-1, AG+37° 1953, 2MASS J20174719+3801585, ALS 11097, HD 193237, MCW 849, BD+37°3871, Hen 3-1871, PLX 4837, CEL 5017, PPM 84645, P Cyg, RAFGL 5493S, GC 28218, HIP 100044, ROT 2959, GCRV 12673, HR 7763, SAO 69773, AAVSO 2014+37A | |
Database references | |
SIMBAD | data |
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