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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 10m 37.48206s[1] |
Declination | –11° 33′ 53.7754″[1] |
Apparent magnitude (V) | +5.43[2] |
Characteristics | |
Spectral type | B5 III[3] |
B−V color index | –0.12[4] |
Astrometry | |
Radial velocity (Rv) | +1.5[2] km/s |
Proper motion (μ) | RA: +29.29[1] mas/yr Dec.: +8.76[1] mas/yr |
Parallax (π) | 7.25 ± 0.33 mas[1] |
Distance | 450 ± 20 ly (138 ± 6 pc) |
Absolute magnitude (MV) | −0.26[5] |
Details | |
Radius | 5.6[6] R☉ |
Luminosity | 219.16[5] L☉ |
Surface gravity (log g) | 4.00[3] cgs |
Temperature | 13,860[3] K |
Metallicity [Fe/H] | –0.26[3] dex |
Rotational velocity (v sin i) | 20[7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
38 Aquarii is a star in the equatorial constellation of Aquarius. 38 Aquarii is its Flamsteed designation; its Bayer designation is e Aquarii. It is a faint star but visible to the naked eye, with an apparent visual magnitude of +5.43.[2] Based on parallax measurements, it is around 450 light-years (140 parsecs) away;[1] it is 0.28 degree south of the ecliptic.
The spectrum of 38 Aquarii matches a stellar classification of B5 III.[3] A luminosity class of III indicates that this is an evolved giant star. It has 5.6[6] times the radius of the Sun and is spinning with a projected rotational velocity of 20 km/s.[7] The outer atmosphere of the star has a blue-white glow from an effective temperature of 13,860 K.[3]