| Identification Data |
| Common Name | |
| Constellation | Aries |
| Star Name | 21 Ari |
| Skymap Number | 2150117 |
| Henry Draper (HD) Number | 13872 |
| Harvard Revised (HR) Number | 657 |
| SAO Number | 75238 |
| Durchmusterung (DM) Number | BD+24 329 |
Washington Double Stars (WDS) Number
| 02157+2503
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 91494 |
| Right Ascension (RA) J2000 | 2h 15m 42.773s |
| Declination (Dec) J2000 | +25° 2' 34.884" |
| Position Uncertainty | 0.0112s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00653 |
| Proper Motion in Dec (J2000) | -0.087267 |
| Radial Velocity | -044.3km s-1 |
| Trigonometric Parallax | +0.02077s |
| Trigonometric Parallax Uncertainty | 0.00089s |
| GCI Unit Vector in X (J2000) | 0.751734 |
| GCI Unit Vector in Y (J2000) | 0.505682 |
| GCI Unit Vector in Z (J2000) | 0.423299 |
| Galactic Longitude | 146.08° |
Galactic Latitude
| -34.01°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.58 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 6.09 |
| Observed B-V Colour | +0.510 |
| 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 | 5.6 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | F6V |
| One-Dimensional Spectral Class | F5 |
| Position Angle | |
| Year of Observation | 1993. AD |
