HD 16004

HD 16004 is blue-white hued star in the northern constellation of Andromeda. It is a challenge to see with the naked eye even under good viewing conditions, having an apparent visual magnitude of 6.26.^[3] Located approximately 660 light-years (202 parsecs) away from the Sun based on parallax, it is drifting closer with a heliocentric radial velocity of −7 km/s.^[4]

HD 16004

Observation data Epoch J2000      Equinox J2000
Constellation	Andromeda[1]
Right ascension	02h 35m 27.90126s[2]
Declination	+39° 39′ 51.7705″[2]
Apparent magnitude (V)	6.26[3]
Characteristics
Spectral type	B9.5 III HgMn[3]
U−B color index	−0.33[3]
B−V color index	−0.30[3]
Astrometry
Radial velocity (Rv)	−6.8±1.1[4] km/s
Proper motion (μ)	RA: +16.659[2] mas/yr Dec.: −34.296[2] mas/yr
Parallax (π)	4.9384±0.1650 mas[2]
Distance	660 ± 20 ly (202 ± 7 pc)
Absolute magnitude (MV)	−0.36[5]
Details
Mass	2.88[6] M☉
Radius	3.274[7] R☉
Luminosity	158[7] L☉
Surface gravity (log g)	3.8[6] cgs
Temperature	10,809[6] K
Metallicity [Fe/H]	−0.17[6] dex
Rotational velocity (v sin i)	30[8] km/s
Age	162[9] Myr
Other designations
BD+39°573, GC 3093, HD 16004, HIP 12057, HR 746, SAO 55680, WDS J02355+3940A[10]
Database references
SIMBAD	data

This is a chemically peculiar mercury-manganese star^[11] with a stellar classification of B9.5 III HgMn.^[3] It is an estimated 162 million years old and is spinning with a projected rotational velocity of 30 km/s.^[8] The star is radiating 158 times the luminosity of the Sun from its photosphere at an effective temperature of 10,809 K.