24 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 39m 31.53468s |
| Declination | −00° 03′ 04.1095″ |
| Apparent magnitude (V) | 6.66 |
| Characteristics | |
| Spectral type | F7 III OR F7V + ? + F9V |
| B−V color index | +0.52 |
| Astrometry | |
| Radial velocity (Rv) | −15.86±0.06 km/s |
| Proper motion (μ) | RA: +215.367 mas/yr Dec.: +17.077 mas/yr |
| Parallax (π) | 25.0839±0.6277 mas |
| Distance | 130 ± 3 ly (39.9 ± 1.0 pc) |
| Absolute magnitude (MV) | 3.45 |
| Orbit | |
| Period (P) | 48.65 yr |
| Semi-major axis (a) | 0.448″ |
| Eccentricity (e) | 0.868 |
| Inclination (i) | 58.0° |
| Longitude of the node (Ω) | 139.3° |
| Periastron epoch (T) | 1971.55 |
| Argument of periastron (ω) (secondary) | 293.0° |
| Details | |
| 24 Aqr Aa | |
| Mass | 1.25 M☉ |
| Radius | 1.42+0.05 −0.08 R☉ |
| Luminosity | 2.864±0.080 L☉ |
| Temperature | 6,231 K |
| Metallicity [Fe/H] | –0.09 dex |
| Age | 3.5 Gyr |
| Other designations | |
| 24 Aqr, BD−00°4245, HD 206058, HIP 106942, SAO 145566, WDS J21395-0003, LTT 8626 | |
| Database references | |
| SIMBAD | data |
24 Aquarii is a triple star system in the equatorial constellation of Aquarius. 24 Aquarii is the Flamsteed designation. The apparent magnitude of this system is 6.66, which, according to the Bortle Dark-Sky Scale, means it is a faint star that is just visible to the naked eye from dark, rural skies. It has an annual parallax shift of 25.08 mas, which is equivalent to a distance of 130 light-years (40 parsecs) from Earth. The system is moving closer to the Earth with a heliocentric radial velocity of −16 km/s.
The calculated orbit of the visual binary has a period of 48.65 years and a large eccentricity of 0.868. The primary, component A, is itself a single-lined spectroscopic binary with a period of 5.8839 days and an eccentricity of 0.071±0.006. One study gives the system a stellar classification of F7 III, suggesting it contains an evolved giant star. Other classifications give classes matching F-type main-sequence stars for components Aa and B.