| Identification Data |
| Common Name | |
| Constellation | Aquarius |
| Star Name | 21 Aqr |
| Skymap Number | 21250057 |
| Henry Draper (HD) Number | 203926 |
| Harvard Revised (HR) Number | 8199 |
| SAO Number | 145384 |
| Durchmusterung (DM) Number | SD-04 5446 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 205175 |
| Right Ascension (RA) J2000 | 21h 25m 16.957s |
| Declination (Dec) J2000 | -3° 33' 24.291" |
| Position Uncertainty | 0.0090s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00083 |
| Proper Motion in Dec (J2000) | -0.069866 |
| Radial Velocity | -024.5km s-1 |
| Trigonometric Parallax | +0.00799s |
| Trigonometric Parallax Uncertainty | 0.00084s |
| GCI Unit Vector in X (J2000) | 0.779152 |
| GCI Unit Vector in Y (J2000) | -0.623757 |
| GCI Unit Vector in Z (J2000) | -0.062037 |
| Galactic Longitude | 49.20° |
Galactic Latitude
| -35.51°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.48 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
| Observed B Magnitude | 6.94 |
| Observed B-V Colour | +1.463 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.006 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.7 |
| Observed Photographic Magnitude | 6.7 |
| Morgan Keenan (MK) Spectral Type | K4III |
| One-Dimensional Spectral Class | K0 |
| Position Angle | |
| Year of Observation | AD |
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