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Star in the constellation Antlia
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]
Distance 320 ± 10
ly (99 ± 3
pc )
Absolute magnitude (MV ) −0.97
[7]
Details
Mass 2.2
[8]
M ☉
Radius 41
[1]
R ☉ Luminosity (bolometric) 412
[1]
L ☉
Surface gravity (log g ) 1.77
[9]
cgs
Temperature 4,070
[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
SIMBAD
data
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 isn't clear but it is suspected of being on the
asymptotic giant branch , with an inert carbon core.
[8]
References
^
a
b
c
d
e
f
g
h
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 .
^ Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven .
Bibcode :
1991bsc..book.....H .
^
a
b
c NSV 4862, database entry,
New Catalogue of Suspected Variable Stars, the improved version , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line October 3, 2008.
^ Houk, Nancy (1983).
Michigan catalogue of two-dimensional spectral types for the HD stars . Michigan Spectral Survey. Vol. 3.
University of Michigan . Retrieved 2009-10-22 .
^
a
b
c Hoffleit, D.; Warren, Jr., W. H.
"HR 4104" . The Bright Star Catalogue (5th revised ed.).
Centre de Données astronomiques de Strasbourg . Retrieved 2008-10-03 .
^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 . University of Toronto:
International Astronomical Union .
Bibcode :
1967IAUS...30...57E .
^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics , 430 : 303–311,
arXiv :
astro-ph/0409683 ,
Bibcode :
2005A&A...430..303C ,
doi :
10.1051/0004-6361:20041440 ,
S2CID
12136256 .
^
a
b
Alpha Antliae , Stars , Jim Kaler. Accessed on line October 3, 2008.
^
a
b McWilliam, Andrew (December 1990).
"High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances" . Astrophysical Journal Supplement Series . 74 : 1075–1128.
Bibcode :
1990ApJS...74.1075M .
doi :
10.1086/191527 .
^
"alf Ant" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved October 3, 2008 .
^ Schneider, Howard; Wood, Sandy (2009). National Geographic Backyard Guide to the Night Sky .
National Geographic Books . p. 173.
ISBN
978-1-4262-0281-0 .