HD 82741

HD 82741 is a single^[10] star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.81.^[1] The distance to HD 82741 is 223 light years, as determined from its annual parallax shift of 14.6 mas.^[2] It is moving further from the Earth with a heliocentric radial velocity of 1 km/s.^[1]

HD 82741

Observation data Epoch J2000      Equinox J2000
Constellation	Lynx[1]
Right ascension	09h 35m 03.83005s[2]
Declination	+39° 37′ 17.3743″[2]
Apparent magnitude (V)	4.81[1]
Characteristics
Evolutionary stage	red clump[3]
Spectral type	G9.5 IIIb Fe-1[4]
B−V color index	0.980[5]
Astrometry
Radial velocity (Rv)	0.992±0.002[1] km/s
Proper motion (μ)	RA: −30.124[2] mas/yr Dec.: +20.155[2] mas/yr
Parallax (π)	14.6281±0.2230 mas[2]
Distance	223 ± 3 ly (68 ± 1 pc)
Absolute magnitude (MV)	0.573[5]
Details
Mass	1.62[6] M☉
Radius	8.78±0.61[7] R☉
Luminosity	58.9[6] L☉
Surface gravity (log g)	2.6[8] cgs
Temperature	4,809±51[6] K
Metallicity [Fe/H]	−0.18[5] dex
Rotational velocity (v sin i)	1.0[8] km/s
Age	2.74[6] Gyr
Other designations
BD+40°2224, FK5 2762, HD 82741, HIP 47029, HR 3809, SAO 61578[9]
Database references
SIMBAD	data

At the age of 2.74^[6] billion years, this is an evolved giant star with a stellar classification of G9.5 IIIb Fe-1,^[4] where the suffix notation indicates an underabundance of iron in its atmosphere. It belongs to a sub-category of giants called the red clump, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core.^[3] With 1.62 times the mass of the Sun,^[6] it has expanded to 9 times the Sun's radius.^[7] It is radiating 58.9 times the Sun's luminosity^[6] from its enlarged photosphere at an effective temperature of 4,809 K.^[6]