| Identification Data |
| Common Name | |
| Constellation | Saggitarius |
| Star Name | 21 Sgr |
| Skymap Number | 18250081 |
| Henry Draper (HD) Number | 169420 |
| Harvard Revised (HR) Number | 6896 |
| SAO Number | 186794 |
| Durchmusterung (DM) Number | SD-20 5134 |
Washington Double Stars (WDS) Number
| 18254-2033
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 268387 |
| Right Ascension (RA) J2000 | 18h 25m 21.040s |
| Declination (Dec) J2000 | -20° 32' 30.044" |
| Position Uncertainty | 0.0196s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00059 |
| Proper Motion in Dec (J2000) | -0.028767 |
| Radial Velocity | -011.8km s-1 |
| Trigonometric Parallax | +0.00546s |
| Trigonometric Parallax Uncertainty | 0.00120s |
| GCI Unit Vector in X (J2000) | 0.103369 |
| GCI Unit Vector in Y (J2000) | -0.930694 |
| GCI Unit Vector in Z (J2000) | -0.350889 |
| Galactic Longitude | 11.74° |
Galactic Latitude
| -3.75°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.86 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.007 |
| Observed B Magnitude | 6.20 |
| Observed B-V Colour | +1.338 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.024 |
| 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 | K2II |
| One-Dimensional Spectral Class | K0 |
| Position Angle | 287 |
| Year of Observation | 1982. AD |
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