10 Persei

10 Persei is a blue supergiant star in the constellation Perseus. Its apparent magnitude is 6.26 although it is slightly variable.

10 Persei

Location of 10 Per (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	02h 25m 16.02834s[1]
Declination	+56° 36′ 35.3544″[1]
Apparent magnitude (V)	6.26[2]
Characteristics
Evolutionary stage	Blue supergiant
Spectral type	B2Ia[3]
U−B color index	−0.61[2]
B−V color index	+0.30[2]
Variable type	α Cyg[4]
Astrometry
Radial velocity (Rv)	−39.87±1.93[1] km/s
Proper motion (μ)	RA: −0.508 mas/yr[1] Dec.: −1.182 mas/yr[1]
Parallax (π)	0.4424±0.0263 mas[1]
Distance	7000±815 ly (2,150±250 pc)[5]
Absolute magnitude (MV)	−6.70[6]
Details[5]
Mass	23.6±1.9 M☉
Radius	49±6 R☉
Luminosity	257,000 L☉
Surface gravity (log g)	2.45±0.07 cgs
Temperature	18,600±300 K
Rotational velocity (v sin i)	48±6 km/s
Age	7.76 Myr
Other designations
V554 Persei, HR 696, HD 14818, BD+55°612, HIP 11279, SAO 23304, GC 2885
Database references
SIMBAD	data

10 Per is the bright star below and right of the Double Cluster

10 Persei is located around 3,333 parsecs (10,870 ly) distant in the Perseus OB1 stellar association. It lies close to the Double Cluster and is considered a cluster member.^[7]

A light curve for V554 Persei, plotted from Hipparcos data^[8]

In 1999, 10 Persei was given the variable star designation V554 Persei, after being identified as varying in Hipparcos photometry.^[9] Its brightness varies by less than a tenth of a magnitude with no clear period.^[4]