| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h 08m 00.04963s[1] |
| Declination | +29° 39′ 15.2428″[1] |
| Apparent magnitude (V) | +5.42[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| U−Bcolor index | +0.57[2] |
| B−Vcolor index | +0.89[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.90±0.14[4] km/s |
| Proper motion (μ) | RA: −32.51[1]mas/yr Dec.: +2.79[1]mas/yr |
| Parallax (π) | 11.92±0.39 mas[1] |
| Distance | 274 ± 9 ly (84 ± 3 pc) |
| Absolute magnitude (MV) | +0.81[5] |
| Details[4] | |
| Mass | 2.42±0.09 M☉ |
| Radius | 7.76±0.51 R☉ |
| Luminosity | 40 L☉ |
| Surface gravity (log g) | 3.21 cgs |
| Temperature | 5,153 K |
| Metallicity [Fe/H] | −0.06 dex |
| Rotational velocity (v sin i) | 1.95±0.45 km/s |
| Age | 620±60 Myr |
| Other designations | |
| τ Cnc,72 Cancri,BD+30° 1817,FK5 2719,HD 78235,HIP 44818,HR 3621,SAO 80650[6] | |
| Database references | |
| SIMBAD | data |
Tau Cancri (τ Cancri) is a solitary,[3] yellow-huedstar in thezodiacconstellation ofCancer. With anapparent visual magnitude of +5.42,[2] it is faintly visible to the naked eye. Based upon an annualparallax shift of 11.92 mas as seen from Earth,[1] it is located around 274 light-years from theSun.
With an age of about 620[4] million years and astellar classification of G8 III,[3] this is ared-clumpgiant star,[7] which indicates that it hasevolved onto thehorizontal branch and is generating energy throughhelium fusion at its core. It is amicrovariable, showing aluminosity variation of 0.04 inmagnitude.[8] Tau Cancri has an estimated 2.4 times themass of the Sun and 7.8 times theSun's radius. The star radiates 40 times thesolar luminosity from itsphotosphere at aneffective temperature of5,153 K.[4]
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