47 Cygni
From Infogalactic: the planetary knowledge core
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 33m 54.18702s[1] |
| Declination | +35° 15′ 03.0659″[1] |
| Apparent magnitude (V) | 4.61[2] |
| Absolute magnitude (V) | −4.1 (−4 + −1.5)[2] |
| Distance | 929[2] ly (285 pc) |
| Spectral type | K6Ib + B3V[2] |
| Database references | |
| SIMBAD | data |
47 Cygni (47 Cyg) is a double star in the constellation Cygnus. Its apparent magnitude is 4.66.
The two stars of 47 Cygni are separated by less than an arcsecond.[3] The supergiant primary is a slow irregular variable with an amplitude of about 0.1 magnitudes.[4] The secondary is a hot B class main sequence star, but still 2.5 magnitudes fainter than the primary.
References
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