| Identification Data |
| Common Name | |
| Constellation | Ophiuchus |
| Star Name | 21 Oph |
| Skymap Number | 16510079 |
| Henry Draper (HD) Number | 152127 |
| Harvard Revised (HR) Number | 6255 |
| SAO Number | 121911 |
| Durchmusterung (DM) Number | BD+01 3323 |
Washington Double Stars (WDS) Number
| 16514+0113
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 163204 |
| Right Ascension (RA) J2000 | 16h 51m 24.928s |
| Declination (Dec) J2000 | +1° 12' 57.410" |
| Position Uncertainty | 0.0162s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00115 |
| Proper Motion in Dec (J2000) | -0.014067 |
| Radial Velocity | -026.3km s-1 |
| Trigonometric Parallax | +0.00945s |
| Trigonometric Parallax Uncertainty | 0.00111s |
| GCI Unit Vector in X (J2000) | -0.294743 |
| GCI Unit Vector in Y (J2000) | -0.955341 |
| GCI Unit Vector in Z (J2000) | 0.021221 |
| Galactic Longitude | 19.36° |
Galactic Latitude
| 27.04°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.51 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 5.56 |
| Observed B-V Colour | +0.051 |
| 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 | 5.5 |
| Observed Photographic Magnitude | 5.5 |
| Morgan Keenan (MK) Spectral Type | A2Vs |
| One-Dimensional Spectral Class | A0 |
| Position Angle | 328 |
| Year of Observation | 1993. AD |
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