12 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 04m 04.74s |
| Declination | -05° 49′ 23.08″ |
| Apparent magnitude (V) | 5.89 |
| Characteristics | |
| Spectral type | G4III |
| U−B color index | 0.41 |
| B−V color index | 0.68 |
| Astrometry | |
| Radial velocity (Rv) | 1.1 km/s |
| Proper motion (μ) | RA: 22.4 mas/yr Dec.: 4.0 mas/yr |
| Parallax (π) | 6.03 ± 1.17 mas |
| Distance | approx. 500 ly (approx. 170 pc) |
| Absolute magnitude (MV) | 7.4 |
| Details | |
| Mass | 1.1 M☉ |
| Radius | 1.1 R☉ |
| Luminosity | 1.2 L☉ |
| Temperature | 5,000–6,000 K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Orbit | |
| Companion | 12 Aquarii B |
| Semi-major axis (a) | 0.1" |
| Orbit | |
| Companion | 12 Aquarii C |
| Semi-major axis (a) | 2.4" |
| Inclination (i) | 195° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
12 Aquarii (abbreviated 12 Aqr) is a double star in the constellation Aquarius. 12 Aquarii is the Flamsteed designation. It is a yellow sub-giant that is slightly larger and heavier than the Sun with an apparent magnitude of 5.53 and absolute magnitude 7.4, making it less bright than the Sun comparatively.
Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| 12 Aquarii B (CSI-06 5664 1) | 21h 04m 04.58s | -05° 49' 24.2 | 7.31 | A3V | Simbad |
| 12 Aquarii C (CSI-06 5664 3) | 21h 04m 04.7247s | -05° 49' 23.038 | 5.53 | G4 | Simbad |
References
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