Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 21h 24m 51.67515s[1] |
Declination | −03° 23′ 54.0858″[1] |
Apparent magnitude (V) | 6.38[2] |
Characteristics | |
Spectral type | F0 V[3] or F0 III[4] |
B−V color index | 0.334±0.002[2] |
Astrometry | |
Radial velocity (Rv) | −23.2±2.9[5] km/s |
Proper motion (μ) | RA: −6.125[1] mas/yr Dec.: −49.515[1] mas/yr |
Parallax (π) | 15.3426 ± 0.0730 mas[1] |
Distance | 213 ± 1 ly (65.2 ± 0.3 pc) |
Absolute magnitude (MV) | 2.37[2] |
Details | |
Mass | 1.52[6] M☉ |
Luminosity | 9.38[2] L☉ |
Surface gravity (log g) | 4.17[6] cgs |
Temperature | 7,314±249[6] K |
Rotational velocity (v sin i) | 92[7] km/s |
Age | 761[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
20 Aquarii, abbreviated 20 Aqr, is a star in the constellation Aquarius. 20 Aquarii is the Flamsteed designation. It is a dim star with an apparent visual magnitude of 6.38.[2] Based upon an annual parallax shift of 15.34 mas,[1] it is located 213 light years away but is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.[5] The star is predicted to come to within 110 light-years in around 1.9 million years.[2]
This is an F-type main-sequence star with a stellar classification of F0 V.[3] (Cowley and Fraquelli [1974] had given it a class of F0 III.)[4] It is a suspected[9] chemically peculiar Am star showing metallic lines.[10] It is 761[6] million years old with a high projected rotational velocity of 92 km/s.[7] The star has 1.52[6] times the mass of the Sun and is radiating 9[2] times the Sun's luminosity from its photosphere at an effective temperature of about 7,314 K.[6]