| Identification Data |
| Common Name | Alathfar |
| Constellation | Lyra |
| Star Name | 2mu Lyr |
| Skymap Number | 18240048 |
| Henry Draper (HD) Number | 169702 |
| Harvard Revised (HR) Number | 6903 |
| SAO Number | 66943 |
| Durchmusterung (DM) Number | BD+39 3410 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 81293 |
| Right Ascension (RA) J2000 | 18h 24m 13.785s |
| Declination (Dec) J2000 | +39° 30' 26.059" |
| Position Uncertainty | 0.0063s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00184 |
| Proper Motion in Dec (J2000) | -0.004666 |
| Radial Velocity | -024.0km s-1 |
| Trigonometric Parallax | +0.00739s |
| Trigonometric Parallax Uncertainty | 0.00052s |
| GCI Unit Vector in X (J2000) | 0.081418 |
| GCI Unit Vector in Y (J2000) | -0.767236 |
| GCI Unit Vector in Z (J2000) | 0.636176 |
| Galactic Longitude | 67.33° |
Galactic Latitude
| 21.80°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.12 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 5.16 |
| Observed B-V Colour | +0.038 |
| 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 | 5.0 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | A3IVn |
| One-Dimensional Spectral Class | A2 |
| Position Angle | |
| Year of Observation | AD |
