| Identification Data |
| Common Name | |
| Constellation | Cetus |
| Star Name | 81 Cet |
| Skymap Number | 2370102 |
| Henry Draper (HD) Number | 16400 |
| Harvard Revised (HR) Number | 771 |
| SAO Number | 130026 |
| Durchmusterung (DM) Number | SD-04 436 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 184843 |
| Right Ascension (RA) J2000 | 2h 37m 41.800s |
| Declination (Dec) J2000 | -3° 23' 46.229" |
| Position Uncertainty | 0.0124s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00260 |
| Proper Motion in Dec (J2000) | -0.044166 |
| Radial Velocity | +007.7km s-1 |
| Trigonometric Parallax | +0.01029s |
| Trigonometric Parallax Uncertainty | 0.00097s |
| GCI Unit Vector in X (J2000) | 0.771109 |
| GCI Unit Vector in Y (J2000) | 0.633941 |
| GCI Unit Vector in Z (J2000) | -0.059240 |
| Galactic Longitude | 174.49° |
Galactic Latitude
| -55.25°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.65 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
| Observed B Magnitude | 6.67 |
| Observed B-V Colour | +1.016 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.006 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.6 |
| Observed Photographic Magnitude | 6.8 |
| Morgan Keenan (MK) Spectral Type | gG5 |
| One-Dimensional Spectral Class | K0 |
| Position Angle | |
| Year of Observation | AD |
