  | |
| 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−Bcolor index | +0.16[2] |
| B−Vcolor index | +0.23[2] |
| Astrometry | |
| Radial velocity (Rv) | +19.8±1.6[4] km/s |
| Proper motion (μ) | RA: −46.727mas/yr[1] Dec.: −9.036mas/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 |
Zeta2 Antliae is a star in the southernconstellation ofAntlia, the air pump. ItsBayer designation isLatinized from ζ2 Antliae, and abbreviated Zet2 Ant or ζ2 Ant, respectively. With anapparent visual magnitude of 5.91,[2] it is a relatively faint star that requiresdark suburban skies for viewing with thenaked eye.Parallax measurements show it to be located at a distance of approximately 370light-years (110parsecs) from Earth.[1] The star is receding with a heliocentricradial velocity of +20 km/s.[4]
Thespectrum of this star matches astellar classification of A9 IV,[3] where theluminosity class of IV indicates that this is asubgiant star that isevolving away from themain sequence as the supply of hydrogen at its core is becoming exhausted. This is catalogued as anAm star, which means it is achemically peculiar star that shows strong indications of certain tracemetals 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 itsphotosphere at aneffective temperature of 7,455 K.[6]
