| Identification Data |
| Common Name | |
| Constellation | Auriga |
| Star Name | 21sig Aur |
| Skymap Number | 5240109 |
| Henry Draper (HD) Number | 35186 |
| Harvard Revised (HR) Number | 1773 |
| SAO Number | 57981 |
| Durchmusterung (DM) Number | BD+37 1175 |
Washington Double Stars (WDS) Number
| 05247+3723
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 70308 |
| Right Ascension (RA) J2000 | 5h 24m 39.141s |
| Declination (Dec) J2000 | +37° 23' 7.244" |
| Position Uncertainty | 0.0080s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00002 |
| Proper Motion in Dec (J2000) | -0.012166 |
| Radial Velocity | -019.6km s-1 |
| Trigonometric Parallax | +0.00635s |
| Trigonometric Parallax Uncertainty | 0.00078s |
| GCI Unit Vector in X (J2000) | 0.122064 |
| GCI Unit Vector in Y (J2000) | 0.785138 |
| GCI Unit Vector in Z (J2000) | 0.607173 |
| Galactic Longitude | 170.53° |
Galactic Latitude
| 0.88°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.99 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 6.43 |
| Observed B-V Colour | +1.444 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.005 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.2 |
| Observed Photographic Magnitude | 6.4 |
| Morgan Keenan (MK) Spectral Type | K4III |
| One-Dimensional Spectral Class | K5 |
| Position Angle | 167 |
| Year of Observation | 1922. AD |
