Kappa Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 37m 45.381s |
| Declination | −04° 13′ 41.00″ |
| Apparent magnitude (V) | 5.030±0.009 |
| Characteristics | |
| Spectral type | K1.5 IIIb CN0.5 |
| U−B color index | +1.16 |
| B−V color index | +1.142 |
| Astrometry | |
| Radial velocity (Rv) | +7.31±0.16 km/s |
| Proper motion (μ) | RA: −69.411 mas/yr Dec.: −119.631 mas/yr |
| Parallax (π) | 14.7149±0.0995 mas |
| Distance | 222 ± 1 ly (68.0 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.96 |
| Details | |
| Mass | 2.554±0.128 M☉ |
| Radius | 13 R☉ |
| Luminosity | 60 L☉ |
| Surface gravity (log g) | 2.63±0.08 cgs |
| Temperature | 4,581±5 K |
| Metallicity [Fe/H] | +0.14±0.04 dex |
| Rotational velocity (v sin i) | 3.8 km/s |
| Other designations | |
| Situla, 63 Aquarii, BD−04 5716, FK5 1595, GC 31581, HD 214376, HIP 111710, HR 8610, SAO 146210, PPM 206585, WDS J22378-0414A | |
| Database references | |
| SIMBAD | data |
Kappa Aquarii is a candidate binary star in the equatorial constellation of Aquarius. Its identifier is a Bayer designation that is Latinized from κ Aquarii, and abbreviated Kappa Aqr or κ Aqr, respectively. This system is visible to the naked eye, but it is faint at an apparent visual magnitude of 5.03. Based upon parallax measurements, it is around 214 light-years (66 parsecs) from the Sun. The system is drifting further away from the Sun with a radial velocity of +7.3 km/s.
The two components are designated Kappa Aquarii A and B. The former is named Situla, pronouced /ˈsɪtjuːlə/, the traditional name for the system.