Cygnus OB2-12
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Cygnus OB2-12 |
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| Observation data Epoch J2000 |
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|---|---|
| Constellation (pronunciation) |
Cygnus |
| Right ascension | 20h 32m 40.9589s |
| Declination | +41° 14' 29.286"' |
| Apparent magnitude (V) | 11.4 |
| Characteristics | |
| Spectral type | B5Iab |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | None |
| Astrometry | |
| Proper motion (μ) | RA: 1.91 mas/yr Dec.: -2.47 mas/yr |
| Parallax (π) | -0.60 ± 2.07 mas |
| Distance | approx. -5000 ly (approx. -2000 pc) |
| Absolute magnitude (MV) | -10.6 |
| Details | |
| Mass | 92 M☉ |
| Luminosity | 6,300,000 L☉ |
| Temperature | 18,500 K |
| Age | 6.43 million years years |
| Other designations | |
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VI CYG 12, JP11 5836, ALS 11417, Cl* NGC 6910, RLP 10, LS III +41 34, CSI+41-20309 2, GSC 03157-00785, 2MASS J20324096+4114291, CXOCyg J203240.94+411428.8, HBHA 4203-50, MHA 289-51, DO 38538, HIC 101364, NSV 13138, 1E 203053+4104.2, Hilt 992, RLP 41, 2E 4378, HIP 101364, ROE 960, 2E 2030.8+4104, IRAS 20308+4104, Schulte 12, EM* AS 424, IRC +40430, UBV M 51941.
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| Database references | |
| SIMBAD | data |
Cygnus OB2-12 is a very bright blue supergiant with an absolute bolometric magnitude -12.2 (all electromagnetic radiation), which approaches the upper limit possible for star luminosities. This makes the star more than 6 million times brighter than Sun. It resides in a volume in the Milky Way from which the light towards Earth is heavily dispersed ("extinction") by interstellar dust. Where it not for intermediate dust, the star would have had a apparent visual magnitude about 1.5, as bright as Deneb (Alpha Cygni), but the actual apparent visual magnitude is 11.4, so that it requires binoculars or a lesser telescope to be seen.
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