| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 22m 39.17113s[1] |
| Declination | –15° 02′ 21.6245″[1] |
| Apparent magnitude (V) | 5.20[2] (5.59/6.72)[3] |
| Characteristics | |
| Spectral type | A2 V + A7 V[4] |
| U−Bcolor index | +0.10[2] |
| B−Vcolor index | +0.20[2] |
| Astrometry | |
| Radial velocity (Rv) | –12[5] km/s |
| Proper motion (μ) | RA: +117.00[1]mas/yr Dec.: +16.48[1]mas/yr |
| Parallax (π) | 15.30±0.79 mas[1] |
| Distance | 210 ± 10 ly (65 ± 3 pc) |
| Orbit[6] | |
| Period (P) | 64.62yr |
| Semi-major axis (a) | 0.408″ |
| Eccentricity (e) | 0.140 |
| Inclination (i) | 77.6° |
| Longitude of the node (Ω) | 276.3° |
| Periastronepoch (T) | 1941.29 |
| Argument of periastron (ω) (secondary) | 354.6° |
| Details | |
| Rotational velocity (v sin i) | 175[7] km/s |
| Other designations | |
| BD–15° 6406,HD 220278,HIP 115404,HR 8890,SAO 165658.[8] | |
| Database references | |
| SIMBAD | data |
97 Aquarii (abbreviated97 Aqr) is abinary star system in theequatorialconstellation ofAquarius.97 Aquarii is theFlamsteed designation. The combinedapparent visual magnitude of the system is 5.20;[2] the brighter star is magnitude 5.59 while the companion is magnitude 6.72.[3] Based upon an annualparallax shift of 15.30 milliarcseconds,[1] this system is at a distance of around 210light-years (64parsecs) from Earth.
The two stars in this system orbit each other over aperiod of 64.62 years at aneccentricity of 0.14.[3] Both areA-type main sequence stars; the primary has astellar classification of A2 V while its companion is A7 V.[4] Their composite spectrum shows the properties of aLambda Boötis star, which means it displayspeculiar abundances of certain elements.[9]
