44 Cygni
| Observation data Epoch 2000.0 Equinox 2000.0 | |
|---|---|
| Constellation | Cygnus |
| A | |
| Right ascension | 20h 30m 59.23s |
| Declination | +36° 56′ 09.0″ |
| Apparent magnitude (V) | 6.22 |
| B | |
| Right ascension | 20h 30m 59.30s |
| Declination | +36° 56′ 07.0″ |
| Apparent magnitude (V) | 10.07 |
| Characteristics | |
| Spectral type | F5Ib |
| Astrometry | |
| Radial velocity (Rv) | −19.91±0.14 km/s |
| Proper motion (μ) | RA: −0.623 mas/yr Dec.: −3.894 mas/yr |
| Parallax (π) | 0.7690±0.0215 mas |
| Distance | 4,200 ± 100 ly (1,300 ± 40 pc) |
| Absolute magnitude (MV) | −6.51 |
| Details | |
| A | |
| Mass | 11.2 M☉ |
| Radius | 74 R☉ |
| Luminosity | 9,151 L☉ |
| Surface gravity (log g) | 1.44 cgs |
| Temperature | 6,554 K |
| Rotational velocity (v sin i) | 6.5 km/s |
| Age | 18 Myr |
| B | |
| Mass | 1.6 M☉ |
| Surface gravity (log g) | 1.05 cgs |
| Temperature | 4,019 K |
| Other designations | |
| 44 Cyg, HD 195593, HIP 101214, WDS J20310+3656 | |
| A: HR 7847, IRAS 20290+3646, 2MASS J20305922+3656091, WISE J203059.22+365609.1 | |
| B: TYC 2697-1634-2 | |
| Database references | |
| SIMBAD | data |
| B | |
44 Cygni is a supergiant star in the constellation Cygnus. It is surrounded by the reflection nebula vdB 133. The nebula Sh 2-106 is found less than a degree to the northwest.
44 Cygni is the primary component of the double star AC 18. Its companion, AC 18 B, has a magnitude of 9.59 compared with 44 Cygni's magnitude of 6.2. They are visually separated by 2", making it challenging, but not impossible, to view optically.