Eta Antliae

Eta Antliae is a double star in the southern constellation of Antlia. Its Bayer designation is Latinized from η Antliae, and abbreviated Eta Ant or η Ant, respectively. The brighter component has an apparent visual magnitude of 5.222,^[3] making it visible to the naked eye. Parallax measurements of the system yield a distance estimate of 108.5 light-years (33.3 parsecs) from Earth.^[7] It is drifting further away with a heliocentric radial velocity of +30 km/s.^[5]

η Antliae

Location of η Antliae (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Antlia[1]
Right ascension	09h 58m 52.275s[2]
Declination	−35° 53′ 27.50″[2]
Apparent magnitude (V)	5.222[3]
Characteristics
Spectral type	F1 V[4]
U−B color index	+0.068[3]
B−V color index	+0.333[3]
Astrometry
Radial velocity (Rv)	+30[5] km/s
Proper motion (μ)	RA: −89.728 mas/yr[2] Dec.: −15.945 mas/yr[2]
Parallax (π)	30.0499±0.0776 mas[2]
Distance	108.5 ± 0.3 ly (33.28 ± 0.09 pc)
Absolute magnitude (MV)	+2.62[1]
Details
η Ant A
Mass	1.55[6] M☉
Radius	1.72[7] R☉
Luminosity	6.6[6] L☉
Surface gravity (log g)	3.94[4] cgs
Temperature	7,132[4] K
Metallicity [Fe/H]	−0.20[4] dex
Age	0.9[6] Gyr
Other designations
η Antliae, Eta Ant, η Ant, CD−35 6050, FK5 377, HD 86629, HIP 48926, HR 3947, SAO 200926, PPM 287133[8]
Database references
SIMBAD	data
	binary set

The main component has a stellar classification of F1 V,^[4] which indicates that it is an F-type main sequence star. This star has 55%^[6] more mass than the Sun and a 72% greater radius.^[7] It shines with 6.6^[6] times the Sun's luminosity at an effective temperature of 7,132 K.^[4] This heat gives it the yellow-white glow of an F-type star.^[9] There is a faint companion star located 31 arcseconds away with an apparent magnitude of +11.3. Most likely this pair form a binary star system.^[10]