HD 77912

HD 77912 is a single^[8] star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.56.^[2] The star is located 650 light years from the Sun, as determined from its annual parallax shift of 5.0 mas.^[1] It is moving further away with a heliocentric radial velocity of +16.6 km/s.^[4] HD 77912 has a peculiar velocity of 23.1+2.9
−1.1 km/s, which may mark it as a runaway star.^[9]

HD 77912

Observation data Epoch J2000      Equinox J2000
Constellation	Lynx
Right ascension	09h 06m 31.76860s[1]
Declination	+38° 27′ 07.9756″[1]
Apparent magnitude (V)	4.56[2]
Characteristics
Spectral type	G7 II Ba0.2[3]
B−V color index	1.037±0.003[4]
Astrometry
Radial velocity (Rv)	+16.6±0.2[4] km/s
Proper motion (μ)	RA: −27.653[1] mas/yr Dec.: −15.055[1] mas/yr
Parallax (π)	5.0045±0.1977 mas[1]
Distance	650 ± 30 ly (200 ± 8 pc)
Absolute magnitude (MV)	−1.46±0.093[5]
Details
Mass	4.60[6] M☉
Radius	33±5[2] R☉
Luminosity	1,168.35[4] L☉
Surface gravity (log g)	1.75[6] cgs
Temperature	4,899[6] K
Metallicity [Fe/H]	−0.14[6] dex
Other designations
BD+39°2200, FK5 1237, HD 77912, HIP 44700, HR 3612, SAO 61254[7]
Database references
SIMBAD	data

The stellar classification of HD 77912 is G7 II Ba0.2,^[3] indicating it is a bright giant with a mild overabundance of barium. It has 4.6^[6] times the mass of the Sun and has expanded to 33^[2] times the Sun's radius. The star is radiating 1,168^[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,899 K.^[6]