| Identification Data |
| Common Name | |
| Constellation | Eridanus |
| Star Name | 21 Eri |
| Skymap Number | 3390003 |
| Henry Draper (HD) Number | 22713 |
| Harvard Revised (HR) Number | 1111 |
| SAO Number | 130634 |
| Durchmusterung (DM) Number | SD-06 713 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 186024 |
| Right Ascension (RA) J2000 | 3h 39m 1.117s |
| Declination (Dec) J2000 | -5° 37' 34.355" |
| Position Uncertainty | 0.0099s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00091 |
| Proper Motion in Dec (J2000) | -0.207166 |
| Radial Velocity | +040.5km s-1 |
| Trigonometric Parallax | +0.02844s |
| Trigonometric Parallax Uncertainty | 0.00077s |
| GCI Unit Vector in X (J2000) | 0.574299 |
| GCI Unit Vector in Y (J2000) | 0.812754 |
| GCI Unit Vector in Z (J2000) | -0.098038 |
| Galactic Longitude | 192.28° |
Galactic Latitude
| -44.75°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.97 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.005 |
| Observed B Magnitude | 6.88 |
| Observed B-V Colour | +0.910 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.006 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 6.2 |
| Observed Photographic Magnitude | 6.8 |
| Morgan Keenan (MK) Spectral Type | K1V |
| One-Dimensional Spectral Class | G5 |
| Position Angle | |
| Year of Observation | AD |
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