83 Aquarii
Binary star in the constellation Aquarius
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83 Aquarii (abbreviated 83 Aqr) is a binary star system in the equatorial constellation of Aquarius. The combined apparent visual magnitude of the pair is 5.43,[2] which is faintly visible to the naked eye. Based upon an annual parallax shift of 15.57 milliarcseconds,[1] it is located at a distance of around 209 light-years (64 parsecs) from Earth.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 05m 09.78684s[1] |
| Declination | −07° 41′ 37.6853″[1] |
| Apparent magnitude (V) | 5.43[2] (6.20/6.34)[3] |
| Characteristics | |
| Spectral type | F2 Vn + F2 V[3] |
| U−B color index | +0.07[2] |
| B−V color index | +0.30[2] |
| Astrometry | |
| Radial velocity (Rv) | −13[4] km/s |
| Proper motion (μ) | RA: +122.41[1] mas/yr Dec.: +7.11[1] mas/yr |
| Parallax (π) | 15.57±0.61 mas[1] |
| Distance | 209 ± 8 ly (64 ± 3 pc) |
| Orbit[5] | |
| Name | 83 Aquarii B |
| Period (P) | 21.840 ± 0.019 yr |
| Semi-major axis (a) | 0.2026 ± 0.0007″ |
| Eccentricity (e) | 0.3878 ± 0.0025 |
| Inclination (i) | 48.01 ± 0.42° |
| Longitude of the node (Ω) | 204.87 ± 0.50° |
| Periastron epoch (T) | 1983.108 ± 0.022 |
| Argument of periastron (ω) (secondary) | 82.83 ± 0.45° |
| Other designations | |
| BD−08 6018, h Aquarii,[6] HD 218060, HIP 113996, HR 8782, SAO 146498.[7] | |
| Database references | |
| SIMBAD | data |
Both stars are F-type main sequence stars.[3] The first component has an apparent magnitude of 6.20; the second is magnitude 6.34.[3] They are orbiting each other with a period of 21.84 years with an eccentricity of 0.388.[5]
On 11 April 2024, it had a close conjunction (geocentric separation <1') with Saturn.[8]: 167