38 Aquarii

This article is about e Aquarii. Not to be confused with ε (epsilon) Aquarii.
38 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Location of 38 Aquarii (circled)
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]
Distance450 ± 20 ly
(138 ± 6 pc)
Absolute magnitude (MV)−0.26[5]
Details
Radius5.6[6] R☉
Luminosity219.16[5] L☉
Surface gravity (log g)4.00[3] cgs
Temperature13,860[3] K
Metallicity [Fe/H]–0.26[3] dex
Rotational velocity (v sin i)20[7] km/s
Other designations
38 Aqr, BD–12°6196, FK5 3771, HD 210424, HIP 109472, HR 8452, SAO 164910[8]
Database references
SIMBADdata

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]

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  2. ^ a b c Cite error: The named reference scfs was invoked but never defined (see the help page).
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  7. ^ a b Cite error: The named reference apj573_1_359 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).