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Alpha Antliae

α Antliae

Location of α Antliae to the upper left of center
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Antlia
Right ascension 10h 27m 09.10313s[1]
Declination −31° 04′ 03.9830″[1]
Apparent magnitude (V) 4.25[2] (4.22 to 4.29[3])
Characteristics
Spectral type K4 III[4]
U−B color index +1.63[5]
B−V color index +1.45[5]
R−I color index +0.79[5]
Variable type Suspected[3]
Astrometry
Radial velocity (Rv)12.2 ± 2[6] km/s
Proper motion (μ) RA: −83.34±0.49[1] mas/yr
Dec.: +8.27±0.48[1] mas/yr
Parallax (π)10.0734 ± 0.3348 mas[1]
Distance320 ± 10 ly
(99 ± 3 pc)
Absolute magnitude (MV)−0.97[7]
Details
Mass2.2[8] M☉
Radius41[1] R☉
Luminosity (bolometric)412[1] L☉
Surface gravity (log g)1.77[9] cgs
Temperature4,070[1] K
Metallicity [Fe/H]-0.39[9] dex
Other designations
α Ant, Alpha Antliae, Alpha Ant, 2MASS J10270911-3104039, CD−30 8465, CPC 17 5084, CPD−30 3121, FK5 392, GC 14352, HD 90610, HIP 51172, HR 4104, NSV 4862, PPM 287713, SAO 201405[10]
Database references
SIMBADdata

Alpha Antliae (Alpha Ant, α Antliae, α Ant) is the brightest star in the constellation of Antlia but it has not been given a proper name.[11] It is approximately 320 light-years from the Solar System. It is a K-type giant star with an apparent visual magnitude of 4.25. This star has 2.2 times the mass of the Sun and has expanded to 41 times the solar radius. Compared to the Sun, it has only 41% of the abundance of elements other than hydrogen and helium.

α Antliae has been reported to vary in brightness between magnitude 4.22 and 4.29, first in 1879 by Benjamin Gould, but this has not been confirmed in modern times.[3] The evolutionary state of α Antliae is not clear but it is suspected of being on the asymptotic giant branch, with an inert carbon core.[8]

  1. ^ a b c d e f g h Cite error: The named reference Gaia-DR2 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference hr was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference nsv1 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference houk83 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference bsc2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference rgcrv1966 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Cardini2005 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference kaler was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference ajss74 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference sb0 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference schneider was invoked but never defined (see the help page).
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