- Cygnus OB2-12
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Cygnus OB2-12 
Cygnus OB2-12 as seen by a hypothetical close orbiting planet.Observation data
Epoch J2000 Equinox J2000Constellation Cygnus Right ascension 20h 32m 40.9589s Declination +41° 14' 29.286" Characteristics Spectral type B3-B5Iae Apparent magnitude (B) 14.41 Apparent magnitude (V) 11.40 Apparent magnitude (J) 4.667±0.324 Apparent magnitude (H) 3.512±0.260 Apparent magnitude (K) 2.704±0.364 B−V color index 3.0 Astrometry Proper motion (μ) RA: 1.91 mas/yr
Dec.: -2.47 mas/yrParallax (π) -0.60 ± 2.07 mas Distance approx. -5000 ly
(approx. -2000 pc)Absolute magnitude (MV) -10.6 Details Mass 92 M☉ Radius 244 R☉ Luminosity 6,300,000 L☉ Temperature 18,500 K Age 6.43 million years Other designations Database references SIMBAD data Cygnus OB2-12 is an extremely bright blue hypergiant with an absolute bolometric magnitude (all electromagnetic radiation) of -12.2, which approaches the upper limit believed possible for normal single stars. This makes the star more than 6 million times brighter than the Sun, and among the most luminous stars known in the galaxy.
It is a member of the Cyg OB2 Association, a cluster of young massive stars about 5000 light years away in Cygnus, and resides in a region of the Galaxy from which visible light is heavily absorbed by interstellar dust when viewed from the Earth. Were it not for the dust extinction, the star would have a visual magnitude about 1.5, nearly as bright as Deneb (Alpha Cygni), but because of the dust, the observed visual magnitude is 11.4, so that it requires binoculars or a small telescope to be seen.
References
Bayer Flamsteed 1 (κ) • 2 • 4 • 6 (β, Albireo) • 7 (ι¹) • 8 • 9 • 10 (ι²) • 11 • 12 (φ) • 13 (θ) • 14 • 15 • 16 (c) • 17 • 18 (δ, Rukh) • 19 • 20 (d) • 21 (η) • 22 • 23 • 24 (ψ) • 25 • 26 (e) • 27 (b¹) • 28 (b²) • 29 (b³) • 30 • 31 (ο¹) • 32 (ο²) • 33 • 34 (P) • 35 • 36 • 37 (γ, Sadr) • 39 • 40 • 41 • 42 • 43 • 44 • 45 (ω¹) • 46 (ω²) • 47 • 48 • 49 • 50 (α, Deneb) • 51 • 52 • 53 (ε, Gienah) • 54 (λ) • 55 • 56 • 57 • 58 (ν) • 59 (f¹) • 60 • 61 • 62 (ξ) • 63 (f²) • 64 (ζ) • 65 (τ) • 66 (υ) • 67 (σ) • 68 (A) • 69 • 70 • 71 (g) • 72 • 73 (ρ) • 74 • 75 • 76 • 77 • 78 (μ) • 79 • 80 (π¹, Azelfafage) • 81 (π², Pennae Caudalis)Nearby Other Cygnus X-1 • Cygnus OB2-12 • KYCategories:- Cygnus constellation
- Hypergiant stars
- Star stubs
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