Eta Antliae
Star in the constellation Antlia
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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]
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Antlia[1] |
| Right ascension | 09h 58m 52.275s[2] |
| Declination | −35° 53′ 27.50″[2] |
| Apparent magnitude (V) | 5.222[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| 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]