| Identification Data |
| Common Name | |
| Constellation | Aquila |
| Star Name | 21 Aql |
| Skymap Number | 19130162 |
| Henry Draper (HD) Number | 179761 |
| Harvard Revised (HR) Number | 7287 |
| SAO Number | 124408 |
| Durchmusterung (DM) Number | BD+02 3824 |
Washington Double Stars (WDS) Number
| 19137+0218
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 167421 |
| Right Ascension (RA) J2000 | 19h 13m 42.702s |
| Declination (Dec) J2000 | +2° 17' 37.347" |
| Position Uncertainty | 0.0093s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00039 |
| Proper Motion in Dec (J2000) | -0.002666 |
| Radial Velocity | -005.4km s-1 |
| Trigonometric Parallax | +0.00509s |
| Trigonometric Parallax Uncertainty | 0.00086s |
| GCI Unit Vector in X (J2000) | 0.315858 |
| GCI Unit Vector in Y (J2000) | -0.947962 |
| GCI Unit Vector in Z (J2000) | 0.040022 |
| Galactic Longitude | 37.53° |
Galactic Latitude
| -3.90°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.15 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 5.08 |
| Observed B-V Colour | -0.074 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.003 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.1 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | B8II-III |
| One-Dimensional Spectral Class | B8 |
| Position Angle | 287 |
| Year of Observation | 1912. AD |
