19 Aquarii

19 Aquarii is a star in the zodiac constellation of Aquarius. With an apparent magnitude of about 5.7,^[2] the star is barely visible to the naked eye as a white-hued star (see Bortle scale). Parallax estimates put it at a distance of about 260 light years away from the Sun.^[1] The star is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.^[5]

19 Aquarii

Observation data Epoch J2000      Equinox J2000
Constellation	Aquarius
Right ascension	21h 25m 13.01629s[1]
Declination	−09° 44′ 54.7923″[1]
Apparent magnitude (V)	+5.713[2]
Characteristics
Spectral type	A8V[3]
B−V color index	+0.20[4]
Astrometry
Radial velocity (Rv)	−20.6±1.8[5] km/s
Proper motion (μ)	RA: +25.943[1] mas/yr Dec.: −167.548[1] mas/yr
Parallax (π)	12.5593±0.1676 mas[1]
Distance	260 ± 3 ly (80 ± 1 pc)
Absolute magnitude (MV)	0.90[6]
Details
Mass	1.86[7] M☉
Radius	2.76+0.18 −0.16[1] R☉
Luminosity	26.1+0.4 −0.4[1] L☉
Surface gravity (log g)	4.13[7] cgs
Temperature	8,078±275[7] K
Rotational velocity (v sin i)	102[8] km/s
Age	788[7] Myr
Other designations
19 Aqr, BD−10°5668, HD 203875, HIP 105761, HR 8195, SAO 145382[9]
Database references
SIMBAD	data

This object is an A-type main-sequence star with a stellar classification of A8V.^[3] It is around 788^[7] million years old with a fairly fast rotation rate, as its projected rotational velocity is about 155 km/s,^[8] so it must be rotating at least that fast. It has 1.86^[7] times the mass of the Sun and 2.76^[1] times the Sun's radius. 19 Aquarii is radiating 26^[1] times the luminosity of the Sun from its photosphere at an effective temperature of 8,078 K.^[7] Eggen has this star flagged as a blue straggler and a member of the HR1614 supercluster.^[10]