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Star in the constellation Aquarius From Wikipedia, the free encyclopedia
39 Aquarii is a star in the zodiac constellation of Aquarius. 39 Aquarii is its Flamsteed designation. It is a faint naked eye star with an apparent visual magnitude of 6.03.[2] Based upon an annual parallax shift of 23.78 measured with a 3% margin of error,[6] this star is at a distance of around 137 light-years (42 parsecs) from Earth. It is a double star with a magnitude 9.3 companion at an angular separation of 0.6 arcseconds along a position angle of 257°.[9]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 12m 25.76398s[1] |
Declination | −14° 11′ 38.3009″[1] |
Apparent magnitude (V) | 6.03[2] |
Characteristics | |
Spectral type | F0 V[3] |
U−B color index | +0.00[4] |
B−V color index | +0.38[2] |
Astrometry | |
Radial velocity (Rv) | +15.2[5] km/s |
Proper motion (μ) | RA: +23.89[6] mas/yr Dec.: -47.43[6] mas/yr |
Parallax (π) | 22.5378 ± 0.1723 mas[1] |
Distance | 145 ± 1 ly (44.4 ± 0.3 pc) |
Absolute magnitude (MV) | 2.92[7] |
Details | |
Mass | 1.35[8] M☉ |
Radius | 1.79+0.04 −0.10[1] R☉ |
Luminosity | 6.109±0.054[1] L☉ |
Surface gravity (log g) | 3.99[3] cgs |
Temperature | 6,806[3] K |
Metallicity [Fe/H] | –0.21[3] dex |
Age | 1.8[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The stellar classification of this star is F0 V;[3] hence it belongs to the category of F-type main sequence stars that generate energy through hydrogen fusion at the core. It is 1.8[7] billion years old with 1.35[8] times the mass of the Sun and 1.79[1] times the Sun's radius. The star is radiating 6.1[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,806 K.[3]
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