50 Aquarii
Star in the constellation Aquarius
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50 Aquarii, abbreviated 50 Aqr, is a single[7] star in the zodiac constellation of Aquarius. 50 Aquarii is its Flamsteed designation. It is a faint star with an apparent visual magnitude of 5.76[2] that is barely visible to the naked eye under good seeing conditions. The star is located near the ecliptic and thus is subject to lunar occultations.[8] Based upon an annual parallax shift of 12.2 mas[1] as seen from Earth orbit, it is located 266 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.[2]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 24m 27.06016s[1] |
| Declination | −13° 31′ 45.7290″[1] |
| Apparent magnitude (V) | 5.76[2] |
| Characteristics | |
| Spectral type | G7.5 III[3] |
| B−V color index | 0.970±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −21.1±2.9[2] km/s |
| Proper motion (μ) | RA: +98.380[1] mas/yr Dec.: −2.909[1] mas/yr |
| Parallax (π) | 12.2800±0.0965 mas[1] |
| Distance | 266 ± 2 ly (81.4 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.03[2] |
| Details[4] | |
| Mass | 2.49±0.25 M☉ |
| Radius | 14.17±0.81 R☉ |
| Luminosity | 103.7±11.5 L☉ |
| Surface gravity (log g) | 2.55±0.07 cgs |
| Temperature | 4,897±34 K |
| Metallicity [Fe/H] | −0.21±0.10 dex |
| Rotational velocity (v sin i) | 4.07[5] km/s |
| Age | 620±170 Myr |
| Other designations | |
| 50 Aqr, CD−14°6276, HD 212430, HIP 110602, HR 8534, SAO 165044[6] | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of G7.5 III[3] that is most likely (87% chance) on the red giant branch.[4] As such, it is estimated to be 620 million years old with 2.5 times the mass of the Sun and has expanded to 14 times the Sun's radius. The star is radiating 104 times the Sun's luminosity from its expanded photosphere at an effective temperature of 4,897 K.[4]