| Identification Data |
| Common Name | Asellus Primus |
| Constellation | Boötes |
| Star Name | 23the Boo |
| Skymap Number | 14250030 |
| Henry Draper (HD) Number | 126660 |
| Harvard Revised (HR) Number | 5404 |
| SAO Number | 29137 |
| Durchmusterung (DM) Number | BD+52 1804 |
Washington Double Stars (WDS) Number
| 14252+5151
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 34508 |
| Right Ascension (RA) J2000 | 14h 25m 11.796s |
| Declination (Dec) J2000 | +51° 51' 2.677" |
| Position Uncertainty | 0.0065s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.02548 |
| Proper Motion in Dec (J2000) | -0.399166 |
| Radial Velocity | -010.9km s-1 |
| Trigonometric Parallax | +0.06863s |
| Trigonometric Parallax Uncertainty | 0.00056s |
| GCI Unit Vector in X (J2000) | -0.497837 |
| GCI Unit Vector in Y (J2000) | -0.365686 |
| GCI Unit Vector in Z (J2000) | 0.786404 |
| Galactic Longitude | 93.83° |
Galactic Latitude
| 59.65°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.05 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 4.56 |
| Observed B-V Colour | +0.507 |
| 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 | 4.1 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | F7V |
| One-Dimensional Spectral Class | F8 |
| Position Angle | 182 |
| Year of Observation | 1971. AD |
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