14 Aquarii
Star in the constellation Aquarius
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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.[4] At its brightest, magnitude 6.44,[7] it could be faintly visible to the naked eye under ideal observing conditions.
Right ascension21h 16m 17.7734s[2]
Declinationâ09° 12â² 52.795â³[2]
Apparentmagnitude(V)6.44 - 6.55[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 16m 17.7734s[2] |
| Declination | â09° 12â² 52.795â³[2] |
| Apparent magnitude (V) | 6.44 - 6.55[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | M4III:[4] |
| BâV color index | 1.57[5] |
| Variable type | SRb[3] |
| Astrometry | |
| Radial velocity (Rv) | 8.00[6] km/s |
| Proper motion (μ) | RA: â1.597[2] mas/yr Dec.: +3.549[2] mas/yr |
| Parallax (Ï) | 2.4622±0.0685 mas[2] |
| Distance | 1,320 ± 40 ly (410 ± 10 pc) |
| Absolute magnitude (MV) | â2.3[4] |
| Details[2] | |
| Mass | 1.9 Mâ |
| Radius | 106 Râ |
| Luminosity | 2,145 Lâ |
| Surface gravity (log g) | +0.36 cgs |
| Temperature | 3,542 K |
| Metallicity [Fe/H] | â0.4 dex |
| Age | 1.5 Gyr |
| Other designations | |
| IW Aquariii, BDâ09°5700, HD 202466, HIP 105019, SAO 145251. | |
| Database references | |
| SIMBAD | data |
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.[8]