14 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 16m 17.7734s |
| Declination | −09° 12′ 52.795″ |
| Apparent magnitude (V) | 6.44 - 6.55 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | M4III: |
| B−V color index | 1.57 |
| Variable type | Semiregular |
| Astrometry | |
| Radial velocity (Rv) | 8.00 km/s |
| Proper motion (μ) | RA: −1.597 mas/yr Dec.: +3.549 mas/yr |
| Parallax (π) | 2.4622±0.0685 mas |
| Distance | 1,320 ± 40 ly (410 ± 10 pc) |
| Absolute magnitude (MV) | −2.3 |
| Details | |
| Mass | 1.9 M☉ |
| Radius | 106 R☉ |
| Luminosity | 2,145 L☉ |
| Surface gravity (log g) | +0.36 cgs |
| Temperature | 3,542 K |
| Metallicity [Fe/H] | −0.4 dex |
| Age | 1.5 Gyr |
| Other designations | |
| IW Aquariii, BD−09°5700, HD 202466, HIP 105019, SAO 145251. | |
| Database references | |
| SIMBAD | data |
14 Aquarii (abbreviated 14 Aqr) is red giant star. 14 Aquarii is the Flamsteed designation; it also bears the variable star designation IW Aquarii. It is a semiregular variable with an amplitude of a tenth of a magnitude, and shows variations on a timescale of just one day. At its brightest, magnitude 6.44, it could be faintly visible to the naked eye under ideal observing conditions.
In 1996 the variability of the brightness of 14 Aquarii was first detected, in the Hipparcos satellite data, resulting in the publication of its variable star designation in 1999.