Epsilon Antliae

Epsilon Antliae
Location of ε Antliae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 09h 29m 14.71968s[1]
Declination –35° 57′ 04.8074″[1]
Apparent magnitude (V) +4.51[2]
Characteristics
Spectral type K3 IIIa[3]
U−B color index +1.68[4]
B−V color index +1.44[4]
Astrometry
Radial velocity (Rv)+22.2[2] km/s
Proper motion (μ) RA: −24.774±0.306[5] mas/yr
Dec.: +5.702±0.357[5] mas/yr
Parallax (π)5.5233 ± 0.2778 mas[5]
Distance590 ± 30 ly
(181 ± 9 pc)
Absolute magnitude (MV)−2.17[6]
Details
Radius56.3+3.7
−7.5[5] R☉
Luminosity919±52[5] L☉
Temperature4,237+315
−134[5] K
Other designations
ε Ant, CD−35 5724, FK5 356, HD 82150, HIP 46515, HR 3765, SAO 200416, PPM 286515[7]
Database references
SIMBADdata

Epsilon Antliae, Latinized from ε Antliae, is the Bayer designation for a single[8] star in the southern constellation of Antlia, being positioned near the western constellation border and forming part of the main asterism.[9] The apparent visual magnitude of this star is +4.51,[2] which means it is visible to the naked eye. From parallax measurements, the distance to this star is known to be 590 ± 30 light-years (180.9 ± 9.2 parsecs). It is drifting further away from the Sun with a radial velocity of +22 km/s.[2]

The stellar classification of this star is K3 IIIa,[3] where the luminosity class of III indicates that this is an evolved giant star that has exhausted the supply of hydrogen at its core. It has expanded to around 56 times the radius of the Sun and radiates approximately 919 times the Sun's luminosity from its photosphere at an effective temperature of 4,237 K.[5] Photometry measurements during the Hipparcos mission indicate that this star is undergoing periodic variability by 0.0034 magnitudes over an 11.07941 day cycle.[10]

  1. ^ a b Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference scfs1999 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference Gaia-DR2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Streicher2010 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference mnras331_1_45 was invoked but never defined (see the help page).