Epsilon Antliae

Epsilon Antliae
	Location of ε Antliae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Antlia
Right ascension	09h 29m 14.71968s
Declination	–35° 57′ 04.8074″
Apparent magnitude (V)	+4.51
Characteristics
Spectral type	K3 IIIa
U−B color index	+1.68
B−V color index	+1.44
Astrometry
Radial velocity (Rv)	+22.2 km/s
Proper motion (μ)	RA: −24.774±0.306 mas/ yr ; Dec.: +5.702±0.357 mas/ yr
Parallax (π)	5.5233 ± 0.2778 mas
Distance	590 ± 30 ly ; (181 ± 9 pc)
Absolute magnitude (MV)	−2.17
Details
Radius	56.3+3.7; −7.5 R☉
Luminosity	919±52 L☉
Temperature	4,237+315; −134 K
Other designations
	ε Ant, CD−35 5724, FK5 356, HD 82150, HIP 46515, HR 3765, SAO 200416
Database references
SIMBAD	data

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]

References

^ ^a ^b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, Astronomisches Rechen-Institut Heidelberg, 35 (35): 1, Bibcode: 1999VeARI..35....1W.
^ ^a ^b Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
^ ^a ^b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
^ ^a ^b ^c ^d ^e ^f ^g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
^ "eps Ant". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-25.{{ cite web}}: CS1 maint: postscript ( link)
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Streicher, Magda (June 2010), "Antlia, the Machine Pneumatique", Monthly Notes of the Astronomical Society of South Africa, 69 (5 and 6): 107–112, Bibcode: 2010MNSSA..69..107S.
^ Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv: astro-ph/0112194, Bibcode: 2002MNRAS.331...45K, doi: 10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.

[aaa474_2_653-1] van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.

[scfs1999-2] Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, Astronomisches Rechen-Institut Heidelberg, 35 (35): 1, Bibcode: 1999VeARI..35....1W.

[mnras389_2_869-3] Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.

[clpl4_99-4] Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J.

[Gaia-DR2-5] ^ ^a ^b ^c ^d ^e ^f ^g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Anderson2012-6] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.

[SIMBAD-7] "eps Ant". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-25.{{ cite web}}: CS1 maint: postscript ( link)

[Eggleton_Tokovinin_2008-8] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[Streicher2010-9] Streicher, Magda (June 2010), "Antlia, the Machine Pneumatique", Monthly Notes of the Astronomical Society of South Africa, 69 (5 and 6): 107–112, Bibcode: 2010MNSSA..69..107S.

[mnras331_1_45-10] Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv: astro-ph/0112194, Bibcode: 2002MNRAS.331...45K, doi: 10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

Observation data Epoch J2000 Equinox J2000
Location of ε Antliae (circled)
Constellation	Antlia
Right ascension	09^h 29^m 14.71968^s^[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 (R_v)	+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]
Distance	590 ± 30 ly (181 ± 9 pc)
Absolute magnitude (M_V)	−2.17^[6]

Details

Radius	56.3+3.7 −7.5^[5] `R`_☉
Luminosity	919±52^[5] `L`_☉
Temperature	4,237+315 −134^[5] K

Other designations
ε Ant, CD−35 5724, FK5 356, HD 82150, HIP 46515, HR 3765, SAO 200416^[7]
Database references
SIMBAD	data

See also

References