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Star in the constellation Centaurus
This article is about g Centauri. It is not to be confused with
G Centauri .
2 Centauri is a single
[13]
star in the
southern
constellation of
Centaurus , located approximately 183
light-years from
Earth .
[3] It has the
Bayer designation g Centauri ;
[12] 2 Centauri is the
Flamsteed designation . This object is visible to the naked eye as faint, red-hued star with an
apparent visual magnitude of 4.19.
[4] It is moving away from the Earth with a heliocentric
radial velocity of +41 km/s.
[8] The star is a member of the
HR 1614 supercluster.
[14]
This is an
evolved
red giant star with a
stellar classification of M5 III.
[6] It is classified as a
semiregular
variable star and its brightness varies from magnitude +4.16 to +4.26
[5] with a period of 12.57 days.
[15] The star has around 70
[10] times the
Sun's radius and is radiating 72
[4] times the
Sun's luminosity from its enlarged
photosphere at an
effective temperature of 3,398
K .
[11]
References
^
"Hipparcos Tools Interactive Data Access" . Hipparcos . ESA. Retrieved 8 December 2021 .
^ Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (2009).
"Long-term photometry and periods for 261 nearby pulsating M giants" . Monthly Notices of the Royal Astronomical Society . 400 (4): 1945–1961.
arXiv :
0908.3228 .
Bibcode :
2009MNRAS.400.1945T .
doi :
10.1111/j.1365-2966.2009.15588.x .
^
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 .
Vizier catalog entry
^
a
b
c
d 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
c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S . 1 .
Bibcode :
2009yCat....102025S .
^
a
b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey . 5 .
Bibcode :
1999MSS...C05....0H .
^
a
b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data .
Bibcode :
1986EgUBV........0M .
^
a
b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters . 32 (11): 759–771.
arXiv :
1606.08053 .
Bibcode :
2006AstL...32..759G .
doi :
10.1134/S1063773706110065 .
S2CID
119231169 .
^ 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 Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics . 367 (Third ed.): 521–524.
arXiv :
astro-ph/0012289 .
Bibcode :
2001A&A...367..521P .
doi :
10.1051/0004-6361:20000451 .
S2CID
425754 .
^
a
b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–357,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352
^
a
b
"2 Cen" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2019-04-06 .
^ 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 .
^ Eggen, Olin J. (June 1998).
"The HR 1614 Group and HIPPARCOS Astrometry" . The Astronomical Journal . 115 (6): 2453–2458.
Bibcode :
1998AJ....115.2453E .
doi :
10.1086/300380 .
^ Ruban, E. V.; Arkharov, A. A.; Hagen-Thorn, E. I.; Novikov, V. V. (September 2009). "Physical parameters of the semiregular variable red giant 2 Cen". Astrophysics . 52 (3): 383–394.
Bibcode :
2009Ap.....52..383R .
doi :
10.1007/s10511-009-9075-3 .
S2CID
121256121 .