Cygnus OB2-8A
From Infogalactic: the planetary knowledge core
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| Observation data Epoch J2000 Equinox J2000 |
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| Constellation | Cygnus |
| Right ascension | 20h 33m 15.07905s[1] |
| Declination | +41° 18′ 50.4762″[1] |
| Apparent magnitude (V) | 9.06[2] |
| Characteristics | |
| Spectral type | O6If/O5.5III(f)[3] |
| B−V color index | 1.30[2] |
| Astrometry | |
| Radial velocity (Rv) | -27.7 km/s |
| Proper motion (μ) | RA: -0.91[1] mas/yr Dec.: -6.02[1] mas/yr |
| Parallax (π) | -3.91 ± 1.76[1] mas |
| Distance | 1,700[4] pc |
| Absolute magnitude (MV) | -7.18/-5.63 |
| Details | |
| Mass | 44.1/37.4[4] M☉ |
| Radius | 20/14.8[4] R☉ |
| Luminosity | 650,000/468,000[4] L☉ |
| Surface gravity (log g) | 3.48/3.67[4] cgs |
| Temperature | 36,800/39,200[4] K |
| Orbit | |
| Primary | Cyg OB2-#8A1 |
| Companion | Cyg Ob2-#8A2 |
| Period (P) | 21.9 days[5] |
| Semi-major axis (a) | >35 R☉[5] |
| Eccentricity (e) | 0.24[5] |
| Semi-amplitude (K1) (primary) |
82.8[5] km/s |
| Semi-amplitude (K2) (secondary) |
95.8[5] km/s |
| Other designations | |
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Schulte 8A, 1E 203127+4108.5, TYC 3161-1325-1, ADS 14000 A, 2E 4382, HIP 101425, UBV 17839, AG+41° 1925, 2E 2031.4+4108, IDS 20297+4058, LS III +41 37, Cyg OB2-8A, 1ES 2031+41.1, 2MASS J20331508+4118504, BD+40° 4227, GCRV 20036, PPM 60129, CCDM J20332+4119A, 1RXS J203315.8+411848, CGO 605, GOS G080.22+00.79 01, SAO 49781, CSI+40 4227 1, GSC 03161-01325.
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| Database references | |
| SIMBAD | data |
Cygnus OB2 #8A or TYC 3161-01325-1 is a double-lined spectroscopic binary with a period of 21.9 days.[5] It is located near the centre of the Cygnus OB2 association.
References
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- Cygnus OB2-8A on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
20h 33m 15.0789s, +41° 18′ 50.494″
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