Red supergiant star in the constellation Cygnus
AZ Cygni
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Observation data Epoch J2000.0 Equinox J2000.0
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Constellation
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Cygnus
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Right ascension
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20h 57m 59.4444s[1]
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Declination
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+46° 28′ 00.583″[1]
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Apparent magnitude (V)
|
7.8 – 9.6[2]
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Characteristics
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Evolutionary stage
|
Red supergiant
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Spectral type
|
M3 Iab[3][4][5] (M2–4 Iab)[6][7]
|
Apparent magnitude (U)
|
13.91[3]
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Apparent magnitude (B)
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10.897±0.065[8]
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Apparent magnitude (G)
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6.190986±0.010832[1]
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Apparent magnitude (T)
|
4.618±0.018[8]
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Apparent magnitude (J)
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2.765±0.234[8]
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Apparent magnitude (H)
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1.744±0.164[8]
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Apparent magnitude (K)
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1.22[9]–1.288±0.172[8]
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B−V color index
|
+2.56[3]
|
J−K color index
|
+1.48[2]
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Variable type
|
SRc[2]
|
Astrometry |
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|
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Radial velocity (Rv) | −5.52±0.99[1] km/s |
Proper motion (μ) | RA: −1.905±0.031[1] mas/yr Dec.: −2.871±0.029[1] mas/yr |
Parallax (π) | 0.4027 ± 0.027 mas[1] |
Distance | 6,820+420 −380[10] ly (2,090+130 −115[10] pc) |
Absolute magnitude (MV) | –5.32[11] |
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Details |
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|
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Mass | 15[10] – 20±9[12] M☉ |
Radius | 911+57 −50[10] R☉ |
Luminosity | 109,800[10](94,800 – 249,400)[10] L☉ |
Surface gravity (log g) | −0.5 – 0.0,[10] cgs |
Temperature | 3,989±117[12] (3,972 – 4,000)[10] K |
Metallicity [Fe/H] | 0.0[10][12][13] dex |
|
Other designations |
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AZ Cyg, BD+45 3349, TYC 3575-553-1, 2MASS J20575942+4628004, SAO 50296 [14] |
Database references |
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SIMBAD | data |
AZ Cygni (BD+45 3349) is a large red supergiant (M3 Iab)[3] in the constellation of Cygnus. Located 2,090 parsecs (6,800 ly) from Earth, it has been studied by the CHARA array in order to understand the surface variations of red supergiants.[10]
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