| Identification Data |
| Common Name | |
| Constellation | Perseus |
| Star Name | 40 Per |
| Skymap Number | 3420057 |
| Henry Draper (HD) Number | 22951 |
| Harvard Revised (HR) Number | 1123 |
| SAO Number | 56646 |
| Durchmusterung (DM) Number | BD+33 698 |
Washington Double Stars (WDS) Number
| 03424+3358
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 68705 |
| Right Ascension (RA) J2000 | 3h 42m 22.646s |
| Declination (Dec) J2000 | +33° 57' 54.095" |
| Position Uncertainty | 0.0114s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00035 |
| Proper Motion in Dec (J2000) | -0.005266 |
| Radial Velocity | +022.3km s-1 |
| Trigonometric Parallax | +0.00353s |
| Trigonometric Parallax Uncertainty | 0.00088s |
| GCI Unit Vector in X (J2000) | 0.468639 |
| GCI Unit Vector in Y (J2000) | 0.684285 |
| GCI Unit Vector in Z (J2000) | 0.558687 |
| Galactic Longitude | 158.93° |
Galactic Latitude
| -16.70°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.98 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 4.93 |
| Observed B-V Colour | -0.051 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.004 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.0 |
| Observed Photographic Magnitude | 4.8 |
| Morgan Keenan (MK) Spectral Type | B0.5V |
| One-Dimensional Spectral Class | B2 |
| Position Angle | 238 |
| Year of Observation | 1925. AD |
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