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 |