| Identification Data |
| Common Name | Aladfar |
| Constellation | Lyra |
| Star Name | 20eta Lyr |
| Skymap Number | 19130179 |
| Henry Draper (HD) Number | 180163 |
| Harvard Revised (HR) Number | 7298 |
| SAO Number | 68010 |
| Durchmusterung (DM) Number | BD+38 3490 |
Washington Double Stars (WDS) Number
| 19138+3909
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 82545 |
| Right Ascension (RA) J2000 | 19h 13m 45.487s |
| Declination (Dec) J2000 | +39° 8' 45.486" |
| Position Uncertainty | 0.0065s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00014 |
| Proper Motion in Dec (J2000) | -0.000666 |
| Radial Velocity | -008.1km s-1 |
| Trigonometric Parallax | +0.00313s |
| Trigonometric Parallax Uncertainty | 0.00051s |
| GCI Unit Vector in X (J2000) | 0.245306 |
| GCI Unit Vector in Y (J2000) | -0.735722 |
| GCI Unit Vector in Z (J2000) | 0.631298 |
| Galactic Longitude | 70.62° |
Galactic Latitude
| 12.75°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.41 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 4.26 |
| Observed B-V Colour | -0.152 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.002 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 4.5 |
| Observed Photographic Magnitude | 4.3 |
| Morgan Keenan (MK) Spectral Type | B2.5IV |
| One-Dimensional Spectral Class | B3 |
| Position Angle | 81 |
| Year of Observation | 1969. AD |
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