| Identification Data |
| Common Name | |
| Constellation | Cygnus |
| Star Name | 55 Cyg |
| Skymap Number | 20480213 |
| Henry Draper (HD) Number | 198478 |
| Harvard Revised (HR) Number | 7977 |
| SAO Number | 50099 |
| Durchmusterung (DM) Number | BD+45 3291 |
Washington Double Stars (WDS) Number
| 20489+4607
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 60515 |
| Right Ascension (RA) J2000 | 20h 48m 56.290s |
| Declination (Dec) J2000 | +46° 6' 50.884" |
| Position Uncertainty | 0.0068s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00028 |
| Proper Motion in Dec (J2000) | -0.002666 |
| Radial Velocity | -007.2km s-1 |
| Trigonometric Parallax | +0.00145s |
| Trigonometric Parallax Uncertainty | 0.00055s |
| GCI Unit Vector in X (J2000) | 0.465962 |
| GCI Unit Vector in Y (J2000) | -0.513263 |
| GCI Unit Vector in Z (J2000) | 0.720722 |
| Galactic Longitude | 85.76° |
Galactic Latitude
| 1.49°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.86 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 5.20 |
| Observed B-V Colour | +0.339 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.004 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 4.9 |
| Observed Photographic Magnitude | 4.7 |
| Morgan Keenan (MK) Spectral Type | B3Ia |
| One-Dimensional Spectral Class | B2 |
| Position Angle | 174 |
| Year of Observation | 1934. AD |
