| Observation
data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cancer |
| Right ascension | 08h16m30.9s |
| Declination | +9°11′08″ |
| Apparent magnitude (V) | +3.50 |
| Distance | 290 ± 25 ly (89 ± 8 pc) |
| Spectral type | K4IIIBa0.5 |
| Other designations | |
Beta Cancri (β Cnc / β Cancri) is the brightest star in the constellation Cancer. It has the traditional name Tarf (Altarf), of uncertain derivation but perhaps from Arabic الطرف aţ-ţarf "the eye" or طرفة aţ-ţarfah "the glance (of Leo)". It is approximately 290 light years from Earth.
The primary component, β Cancri A, is an orange K-type giant with an apparent magnitude of +3.50 and absolute magnitude of -1.25 (visual). It has a faint, fourteenth magnitude companion, β Cancri B, located 29 arcseconds from the primary.
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