11 Persei

11 Persei is a single^[11][8] star in the constellation of Perseus, located about 418 light years away from the Sun. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.76.^[2]

11 Persei

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Perseus
Right ascension	02h 43m 02.83826s[1]
Declination	+55° 06′ 21.6700″[1]
Apparent magnitude (V)	5.76[2]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	B7 III(p?) (Hg?)[4]
B−V color index	−0.110±0.003[2]
Astrometry
Radial velocity (Rv)	−0.7±1.0[2] km/s
Proper motion (μ)	RA: +34.859[1] mas/yr Dec.: −21.955[1] mas/yr
Parallax (π)	7.8022±0.0874 mas[1]
Distance	418 ± 5 ly (128 ± 1 pc)
Absolute magnitude (MV)	0.16[2]
Details
Mass	3.77±0.06[3] M☉
Radius	3.2[5] R☉
Luminosity	210.4+21.9 −19.9[3] L☉
Surface gravity (log g)	4.19[6] cgs
Temperature	14,550[6] K
Metallicity [Fe/H]	+0.09[6] dex
Rotation	25–70 d[7]
Rotational velocity (v sin i)	4.50[8] km/s
Age	50.9±12.2[9] Myr
Other designations
11 Per, BD+54°598, FK5 2188, HD 16727, HIP 12692, HR 785, SAO 23555[10]
Database references
SIMBAD	data

This is a chemically peculiar mercury-manganese star.^[12][6] Cowley (1972) found a stellar classification of B7 III(p?) (Hg?),^[4] while Hube (1970) had B8 IV,^[13] and Appenzeller (1967) showed B6 V.^[14] Stellar models indicate this is a young B-type main sequence star^[3] with an estimated age of around 51^[9] million years. It has a low rotation rate, showing a projected rotational velocity of 4.50 km/s.^[8] The star has 3.8^[3] times the mass of the Sun and is radiating 210^[3] times the Sun's luminosity from its photosphere at an effective temperature of 14,550 K.^[6]