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Binary star system in the constellation Antlia. From Wikipedia, the free encyclopedia
Zeta1 Antliae is the Bayer designation for a binary star[3] system in the southern constellation of Antlia. Based upon parallax measurements, the pair are located at a distance of roughly 350 light-years (110 parsecs) from Earth.[1] They have apparent magnitudes of +6.20 and +7.01 and are separated by 8.042 arcseconds.[3] The apparent magnitude of the combined system is +5.76,[2] which is bright enough to be seen with the naked eye in suitably dark skies.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Antlia |
Right ascension | 09h 30m 46.09678s[1] |
Declination | −31° 53′ 21.1911″[1] |
Apparent magnitude (V) | 5.76[2] (6.20/7.01)[3] |
Characteristics | |
Spectral type | A0 V + A2 V[3] |
U−B color index | +0.05[2] |
B−V color index | +0.05[2] |
Astrometry | |
ζ1 Ant A | |
Proper motion (μ) | RA: +19.044[4] mas/yr Dec.: −22.448[4] mas/yr |
Parallax (π) | 9.3166 ± 0.0605 mas[4] |
Distance | 350 ± 2 ly (107.3 ± 0.7 pc) |
ζ1 Ant B | |
Proper motion (μ) | RA: +20.756[5] mas/yr Dec.: −21.530[5] mas/yr |
Parallax (π) | 9.3970 ± 0.0529 mas[5] |
Distance | 347 ± 2 ly (106.4 ± 0.6 pc) |
Details | |
ζ1 Ant A | |
Mass | 2.46[6] M☉ |
Radius | 2.26[6] R☉ |
Luminosity | 39.8[6] L☉ |
Surface gravity (log g) | 4.1[6] cgs |
Temperature | 9,641[6] K |
Rotational velocity (v sin i) | 204[7] km/s |
ζ1 Ant B | |
Mass | 2.23[6] M☉ |
Radius | 1.74[6] R☉ |
Luminosity | 16.9[6] L☉ |
Surface gravity (log g) | 4.3[6] cgs |
Temperature | 8,872[6] K |
Rotational velocity (v sin i) | 50[7] km/s |
Other designations | |
ζ1 Ant A: GC 13137, HD 82384, HR 3781, SAO 200445 | |
ζ1 Ant B: GC 13135, HD 82383, HR 3780, SAO 200444 | |
Database references | |
SIMBAD | ζ1 Ant A |
ζ1 Ant B |
The two system components A and B are both A-type main sequence stars,[3] hotter, larger, and more luminous than the Sun. The primary is spinning rapidly and the secondary relatively slowly.[7] The primary has a mass of 2.46 M☉, an effective temperature of 9,641 K, a radius of 2.26 R☉, and a bolometric luminosity of 39.8 L☉. The secondary has a mass of 2.23 M☉, an effective temperature of 8,872 K, a radius of 1.74 R☉, and a bolometric luminosity of 16.9 L☉.[6]