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Star in the southern constellation of Capricornus.
24 Capricorni
Location of α Capricorni (red circled)
Observation data
Epoch J2000
Equinox J2000
Constellation
Capricornus
Right ascension
21h 07m 07.66733s
[1]
Declination
−25° 00′ 21.0790″
[1]
Apparent magnitude (V)
+4.49
[2]
Characteristics
Evolutionary stage
AGB
[3]
Spectral type
M1− III
[4]
B−V
color index
1.604± 0.005
[2]
Astrometry
Radial velocity (Rv ) +32.1± 0.8
[2] km/s
Proper motion (μ)
RA: −28.09
[1]
mas /
yr
Dec.: −44.14
[1]
mas /
yr
Parallax (π) 7.15 ± 0.22
mas
[1]
Distance 460 ± 10
ly (140 ± 4
pc )
Absolute magnitude (MV ) −1.24
[2]
Details
Radius 54.06+1.88 −2.72
[5]
R ☉
Luminosity 611± 41
[5]
L ☉
Temperature 3,903+102 −66
[5]
K
Other designations
A Capricorni
[6] ,
24 Cap ,
CD −25° 15235 ,
FK5 791,
GC 29490,
HD 200914,
HIP 104234,
HR 8080,
SAO 190025,
ADS 14632,
CCDM J21071-2500
[7]
Database references
SIMBAD
data
24 Capricorni or A Capricorni is a single
[8]
star in the southern
constellation of
Capricornus . This object is visible to the naked eye as a faint, red-hued star with an
apparent visual magnitude of +4.49.
[2] It is approximately 460
light years from the Sun, based on
parallax .
[1] The star is moving further from the Earth with a heliocentric
radial velocity of +32 km/s.
[2]
This is an aging
red giant , currently on the
asymptotic giant branch ,
[3] with a
stellar classification of M1− III;
[4] a star that has exhausted the supply of hydrogen at its
core and expanded to 54
[5] times the
Sun's radius . It is radiating 611
[5] times the
Sun's luminosity from its enlarged
photosphere at an
effective temperature of 3,903 K.
[5]
Chinese name
In R. H. Allen's book, this star is described as having the name Tsoo , representing the state of
Chu . Bayer described it as one of the last three stars of the tail of the goat, although this is not how they appear in modern visual representations of the constellation
[9]
References
^
a
b
c
d
e
f van Leeuwen, F. (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
e
f 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 .
^
a
b Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal , 104 (1): 275–313,
Bibcode :
1992AJ....104..275E ,
doi :
10.1086/116239 .
^
a
b Keenan, P. C.; McNeil, R. C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series , 71 : 245,
Bibcode :
1989ApJS...71..245K ,
doi :
10.1086/191373 .
^
a
b
c
d
e
f
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 .
^
Benjamin Apthorp Gould ,
URANOMETRIA ARGENTINA , archived from
the original on 2012-02-27, retrieved 2019-06-10 .
^
"24 Cap" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2018-06-15 .
^ 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 .
^ R.H.Allen,
Star Names , p. 142, retrieved 2019-06-10 .