HD 23753

HD 23753 is a single^[11] star in the equatorial zodiac constellation of Taurus, and is a member of the Pleiades open cluster.^[12] It is dimly visible to the naked eye with an apparent visual magnitude of 5.44.^[1] The distance to this star, as determined from its annual parallax shift of 7.7 mas, is about 424 light years. It is moving further from the Earth with a heliocentric radial velocity of +8 km/s.^[5] The star is positioned near the ecliptic and so is subject to lunar occultations.^[13]

HD 23753

HD 23753, circled in red, in a long exposure of the Pleiades
Observation data Epoch J2000      Equinox J2000
Constellation	Taurus[1]
Right ascension	03h 48m 20.81678s[2]
Declination	+23° 25′ 16.4959″[2]
Apparent magnitude (V)	5.44[1]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	B9 Vn[4]
B−V color index	−0.067±0.008[1]
Astrometry
Radial velocity (Rv)	+7.6±0.5[5] km/s
Proper motion (μ)	RA: +19.695[2] mas/yr Dec.: −47.113[2] mas/yr
Parallax (π)	7.6909±0.0985 mas[2]
Distance	424 ± 5 ly (130 ± 2 pc)
Absolute magnitude (MV)	0.00[1]
Details
Mass	3.21±0.07[3] M☉
Radius	2.7[6] R☉
Luminosity	150.0+16.2 −14.8[3] L☉
Surface gravity (log g)	4.09[7] cgs
Temperature	11,535+80 −79[3] K
Metallicity [Fe/H]	−0.57[7] dex
Rotation	0.6994 d[8]
Rotational velocity (v sin i)	335[3] km/s
Age	125[9] Myr
Other designations
NSV 1321, AAVSO 0343+23D, BD+22°563, HD 23753, HIP 17776, HR 1172, SAO 76215[10]
Database references
SIMBAD	data

This is a B-type main-sequence star with a stellar classification of B9 Vn,^[4] where the 'n' indicates "nebulous" lines due to rapid rotation. It is 125 million years old^[9] with a projected rotational velocity of 335 km/s,^[3] completing a full revolution about its axis every 16.79 hours.^[8] HD 23753 has been catalogued as a suspected variable star with the designation NSV 1321,^[14] although the amplitude is no more than 0.1 magnitude and it may even be suitable for a photometric standard.^[15] Wraight et al. report that STEREO detected very shallow eclipses, with a period of 2.2663 days, during which the brightness falls by 1%.^[16]

HD 23753 has 3.21 times the mass of the Sun^[3] and 2.7 times the Sun's radius.^[6] It is radiating 150 times the Sun's luminosity^[3] from its photosphere at an effective temperature of 11,535 K.^[3]