| Identification Data |
| Common Name | |
| Constellation | Perseus |
| Star Name | 18tau Per |
| Skymap Number | 2540036 |
| Henry Draper (HD) Number | 17878 |
| Harvard Revised (HR) Number | 854 |
| SAO Number | 23685 |
| Durchmusterung (DM) Number | BD+52 641 |
Washington Double Stars (WDS) Number
| 02543+5246
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 28080 |
| Right Ascension (RA) J2000 | 2h 54m 15.460s |
| Declination (Dec) J2000 | +52° 45' 44.924" |
| Position Uncertainty | 0.0226s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00022 |
| Proper Motion in Dec (J2000) | -0.004566 |
| Radial Velocity | +002.2km s-1 |
| Trigonometric Parallax | +0.01315s |
| Trigonometric Parallax Uncertainty | 0.00085s |
| GCI Unit Vector in X (J2000) | 0.438470 |
| GCI Unit Vector in Y (J2000) | 0.417031 |
| GCI Unit Vector in Z (J2000) | 0.796134 |
| Galactic Longitude | 141.03° |
Galactic Latitude
| -5.74°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.94 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 4.68 |
| Observed B-V Colour | +0.743 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.003 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 4.1 |
| Observed Photographic Magnitude | 3.9 |
| Morgan Keenan (MK) Spectral Type | G4III+A4V |
| One-Dimensional Spectral Class | G0 |
| Position Angle | 106 |
| Year of Observation | 1925. AD |
