Zeta2 Antliae

Zeta² Antliae is a star in the southern constellation of Antlia, the air pump. Its Bayer designation is Latinized from ζ² Antliae, and abbreviated Zet² Ant or ζ² Ant, respectively. With an apparent visual magnitude of 5.91,^[2] it is a relatively faint star that requires dark suburban skies for viewing with the naked eye. Parallax measurements show it to be located at a distance of approximately 370 light-years (110 parsecs) from Earth.^[1] The star is receding with a heliocentric radial velocity of +20 km/s.^[4]

For other stars with this designation, see Zeta Antliae.

Zeta² Antliae

Location of ζ2 Antliae (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Antlia
Right ascension	09h 31m 32.155s[1]
Declination	−31° 52′ 18.52″[1]
Apparent magnitude (V)	5.91[2]
Characteristics
Spectral type	A9 IV[3]
U−B color index	+0.16[2]
B−V color index	+0.23[2]
Astrometry
Radial velocity (Rv)	+19.8±1.6[4] km/s
Proper motion (μ)	RA: −46.727 mas/yr[1] Dec.: −9.036 mas/yr[1]
Parallax (π)	8.8101±0.0593 mas[1]
Distance	370 ± 2 ly (113.5 ± 0.8 pc)
Absolute magnitude (MV)	+0.44[5]
Details
Mass	1.71[6] M☉
Radius	4.22[6] R☉
Luminosity	49.5[6] L☉
Surface gravity (log g)	3.42[6] cgs
Temperature	7,455[6] K
Other designations
ζ2 Antliae, Zet2 Ant, ζ2 Ant, CD−31 7369, HD 82513, HIP 46734, HR 3789, SAO 200459, PPM 286565[7]
Database references
SIMBAD	data

The spectrum of this star matches a stellar classification of A9 IV,^[3] where the luminosity class of IV indicates that this is a subgiant star that is evolving away from the main sequence as the supply of hydrogen at its core is becoming exhausted. This is catalogued as an Am star, which means it is a chemically peculiar star that shows strong indications of certain trace metals in its spectrum.^[5] However, the chemical peculiarity is now considered doubtful.^[8] The star has 1.7 times the mass and 4.2 times the radius of the Sun. It is radiating 49.5 times the luminosity of the Sun from its photosphere at an effective temperature of 7,455 K.^[6]