| Identification Data |
| Common Name | Altarf |
| Constellation | Cancer |
| Star Name | 17bet Cnc |
| Skymap Number | 8160123 |
| Henry Draper (HD) Number | 69267 |
| Harvard Revised (HR) Number | 3249 |
| SAO Number | 116569 |
| Durchmusterung (DM) Number | BD+09 1917 |
Washington Double Stars (WDS) Number
| 08165+0911
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 154193 |
| Right Ascension (RA) J2000 | 8h 16m 30.920s |
| Declination (Dec) J2000 | +9° 11' 7.961" |
| Position Uncertainty | 0.0146s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00316 |
| Proper Motion in Dec (J2000) | -0.048766 |
| Radial Velocity | +022.2km s-1 |
| Trigonometric Parallax | +0.01123s |
| Trigonometric Parallax Uncertainty | 0.00097s |
| GCI Unit Vector in X (J2000) | -0.553861 |
| GCI Unit Vector in Y (J2000) | 0.817163 |
| GCI Unit Vector in Z (J2000) | 0.159632 |
| Galactic Longitude | 214.26° |
Galactic Latitude
| 23.05°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.52 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 5.00 |
| Observed B-V Colour | +1.483 |
| 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 | 3.8 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | K4IIIBa0.5 |
| One-Dimensional Spectral Class | K2 |
| Position Angle | 294 |
| Year of Observation | 1910. AD |
