| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 49m 35.5023s |
| Declination | -13° 35′ 33.475″ |
| Apparent magnitude (V) | 4.053 |
| Characteristics | |
| Spectral type | K5III |
| U−B color index | 1.95 |
| B−V color index | 1.57 |
| Astrometry | |
| Radial velocity (Rv) | 1 km/s |
| Proper motion (μ) | RA: -12.58 mas/yr Dec.: -38.8 mas/yr |
| Parallax (π) | 8.58 ± 0.98 mas |
| Distance | approx. 380 ly (approx. 120 pc) |
| Absolute magnitude (MV) | 5.652 |
| Details | |
| Mass | 0.8 M☉ |
| Radius | 0.9 R☉ |
| Luminosity | 0.4 L☉ |
| Temperature | 3,500–5,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
Tau2 Aquarii (τ2 Aqr, τ2 Aquarii) is a star in the constellation Aquarius.
τ2 Aquarii is a M-type red giant with an apparent magnitude of +4.05. It is approximately 380 light years from Earth.
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