| Identification Data |
| Common Name | Alioth |
| Constellation | Ursa Major |
| Star Name | 77eps UMa |
| Skymap Number | 12540004 |
| Henry Draper (HD) Number | 112185 |
| Harvard Revised (HR) Number | 4905 |
| SAO Number | 28553 |
| Durchmusterung (DM) Number | BD+56 1627 |
Washington Double Stars (WDS) Number
| 12540+5558
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 33769 |
| Right Ascension (RA) J2000 | 12h 54m 1.749s |
| Declination (Dec) J2000 | +55° 57' 35.356" |
| Position Uncertainty | 0.0059s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.01331 |
| Proper Motion in Dec (J2000) | -0.009066 |
| Radial Velocity | -009.3km s-1 |
| Trigonometric Parallax | +0.04030s |
| Trigonometric Parallax Uncertainty | 0.00062s |
| GCI Unit Vector in X (J2000) | -0.544291 |
| GCI Unit Vector in Y (J2000) | -0.130746 |
| GCI Unit Vector in Z (J2000) | 0.828645 |
| Galactic Longitude | 122.18° |
Galactic Latitude
| 61.16°
|
| Observational Data |
| Observed Visual Magnitude (V) | 1.76 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.005 |
| Observed B Magnitude | 1.80 |
| Observed B-V Colour | +0.041 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.007 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 1.7 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | A0pCr |
| One-Dimensional Spectral Class | A0 |
| Position Angle | 94 |
| Year of Observation | 1975. AD |
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