1 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 39m 24.8915s |
| Declination | +00° 29′ 11.201″ |
| Apparent magnitude (V) | 5.154 |
| Characteristics | |
| Spectral type | K1III |
| U−B color index | 0.97 |
| B−V color index | 1.06 |
| Astrometry | |
| Radial velocity (Rv) | -42.7 km/s |
| Proper motion (μ) | RA: 103.00 mas/yr Dec.: -19.44 mas/yr |
| Parallax (π) | 13.33 ± 0.88 mas |
| Distance | 240 ± 20 ly (75 ± 5 pc) |
| Absolute magnitude (MV) | 0.77[1] |
| Details | |
| Temperature | 3,500–5,000 K |
| Metallicity | -0.12[1] |
| Rotation | 1.9[1] |
| Age | ~5 × 109 years |
| Orbit | |
| Companion | 1 Aquarii B |
| Semi-major axis (a) | 59.7" |
| Inclination (i) | 221° |
| Orbit | |
| Companion | 1 Aquarii C |
| Semi-major axis (a) | 69.8" |
| Inclination (i) | 36° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
1 Aquarii, also known as 1 Aqr, is a multiple star in the constellation Aquarius. 1 Aqr A is a K-class giant of the spectral type K1III. Its companions, B and C, are optical and have no physical relation to 1 Aqr A. 1 Aquarii is known to be an infra-red source.
Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Database references |
|---|---|---|---|---|
| 1 Aquarii B (BD-00 4064B) | 20h 39m 21.8s | +00° 28' 25 | 11.5 | Simbad |
| 1 Aquarii C (BD-00 4064C) | 20h 39m 27.1s | +00° 30' 07 | 11.3 | Simbad |
References
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