| Identification Data |
| Common Name | |
| Constellation | Serpens |
| Star Name | 21iot Ser |
| Skymap Number | 15410071 |
| Henry Draper (HD) Number | 140159 |
| Harvard Revised (HR) Number | 5842 |
| SAO Number | 101682 |
| Durchmusterung (DM) Number | BD+20 3138 |
Washington Double Stars (WDS) Number
| 15416+1940
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 131608 |
| Right Ascension (RA) J2000 | 15h 41m 33.049s |
| Declination (Dec) J2000 | +19° 40' 13.446" |
| Position Uncertainty | 0.0302s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00410 |
| Proper Motion in Dec (J2000) | -0.038667 |
| Radial Velocity | -017.2km s-1 |
| Trigonometric Parallax | +0.01697s |
| Trigonometric Parallax Uncertainty | 0.00077s |
| GCI Unit Vector in X (J2000) | -0.534873 |
| GCI Unit Vector in Y (J2000) | -0.774987 |
| GCI Unit Vector in Z (J2000) | 0.336609 |
| Galactic Longitude | 31.42° |
Galactic Latitude
| 50.45°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.51 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 4.57 |
| Observed B-V Colour | +0.058 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.002 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 4.5 |
| Observed Photographic Magnitude | 4.6 |
| Morgan Keenan (MK) Spectral Type | A1V |
| One-Dimensional Spectral Class | A2 |
| Position Angle | |
| Year of Observation | 1993. AD |
