Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h24m 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 | |
Database references | |
SIMBAD | data |
50 Aquarii, abbreviated 50 Aqr, is a single[7] star in the zodiac constellationofAquarius. 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 shiftof12.2 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]
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]
| |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
Stars |
| ||||||||||||
| |||||||||||||
| |||||||||||||
| |||||||||||||
Galaxies |
| ||||||||||||
| |||||||||||||
| |||||||||||||