| Identification Data |
| Common Name | Alfirk |
| Constellation | Cepheus |
| Star Name | 8bet Cep |
| Skymap Number | 21280122 |
| Henry Draper (HD) Number | 205021 |
| Harvard Revised (HR) Number | 8238 |
| SAO Number | 10057 |
| Durchmusterung (DM) Number | BD+69 1173 |
Washington Double Stars (WDS) Number
| 21287+7034
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 10863 |
| Right Ascension (RA) J2000 | 21h 28m 39.597s |
| Declination (Dec) J2000 | +70° 33' 38.578" |
| Position Uncertainty | 0.0065s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00252 |
| Proper Motion in Dec (J2000) | +0.008766 |
| Radial Velocity | -008.2km s-1 |
| Trigonometric Parallax | +0.00548s |
| Trigonometric Parallax Uncertainty | 0.00047s |
| GCI Unit Vector in X (J2000) | 0.262845 |
| GCI Unit Vector in Y (J2000) | -0.204141 |
| GCI Unit Vector in Z (J2000) | 0.942995 |
| Galactic Longitude | 107.54° |
Galactic Latitude
| 14.03°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.23 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 3.02 |
| Observed B-V Colour | -0.207 |
| 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 | 3.3 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | B1IV |
| One-Dimensional Spectral Class | B1 |
| Position Angle | 51 |
| Year of Observation | 1990. AD |
