| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 16m 50.0364s |
| Declination | -07° 46′ 59.845″ |
| Apparent magnitude (V) | 4.175 |
| Characteristics | |
| Spectral type | G8III |
| U−B color index | 0.81 |
| B−V color index | 0.98 |
| Astrometry | |
| Radial velocity (Rv) | -14.7 km/s |
| Proper motion (μ) | RA: 118.95 mas/yr Dec.: -21.91 mas/yr |
| Parallax (π) | 17.04 ± 0.74 mas |
| Distance | 191 ± 8 ly (59 ± 3 pc) |
| Absolute magnitude (MV) | 5.144 |
| Details | |
| Mass | 1.1 M☉ |
| Radius | 1.1 R☉ |
| Luminosity | 1.2 L☉ |
| Temperature | 5,000–6,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Aquarii (θ Aqr, θ Aquarii) is a star in the constellation Aquarius. It has the traditional name Ancha, Medieval Latin for "the haunch".
In Chinese, 泣 (Qì), meaning Weeping, refers to an asterism consisting of θ Aquarii and ρ Aquarii.[1] Consequently, θ Aquarii itself is known as 泣二 (Qì èr, English: the Second Star of Weeping.)[2]. Possibly, the name Lei meaning tears (weeping) in Chinese, was appear from the Chinese name for this star[3]
Ancha belongs to the spectral class G8 and has an magnitude of +4.17. Ancha is 191 light years from Earth. Since it is near the ecliptic it can be occulted by the Moon, or very rarely by planets.
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