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Star in the constellation Corona Australis
κ1 Coronae Australis
Observation data
Epoch
J2000.0
Equinox
J2000.0 (
ICRS )
Constellation
Corona Australis
Right ascension
18h 33m 23.0809s
[1]
Declination
−38° 43′ 12.166″
[1]
Apparent magnitude (V)
6.17± 0.01
[2]
Characteristics
Spectral type
A0 IV
[3]
B−V
color index
−0.06
[4]
Astrometry
Radial velocity (Rv ) −16± 3.7
[5] km/s
Proper motion (μ)
RA: −0.512
mas /
yr
[1]
Dec.: −22.550
mas /
yr
[1]
Parallax (π) 4.4833 ± 0.0831
mas
[1]
Distance 730 ± 10
ly (223 ± 4
pc )
Absolute magnitude (MV ) −0.78
Details
[6]
Mass 2.82± 0.38
M ☉
Radius 3.79± 0.15
R ☉
Luminosity 179± 14
L ☉
Surface gravity (log g ) 3.73± 0.07
cgs
Temperature 11,079
[7]
K
Metallicity [Fe/H]−0.2
[8]
dex
Rotational velocity (v sin i ) 339
[9] km/s
Age 4.1± 1.8
[10]
Myr
Other designations
κ1 CrA ,
16 G. Coronae Australis
[11] ,
CD −38°12896 ,
CPD −38°7538 ,
GC 25315,
HD 170868,
HIP 90969,
HR 6952,
SAO 210293, 210296,
WDS J18334-3844B
[12]
Database references
SIMBAD
data
Kappa1 Coronae Australis (Kappa1 CrA),
Latinized from κ1 Coronae Australis , is a
star located in the southern
constellation
Corona Australis . It has an
apparent magnitude of 6.17, placing it near the limit for
naked eye visibility.
There has been some disagreement about the object's distance. The New Hipparcos Reduction calculates a
parallax of 21.18± 6.53
mas ,
[13] yielding a distance of 154± 47
light years , somewhat poorly constrained. New analysis from the
Gaia spacecraft find that it has a physical relation to
κ2 Coronae Australis .
[14] Both of their currently parallaxes place them around 700
light years away.
[1] As of 2018, the two stars have an
angular separation of 20.5
″ along a
position angle of 359
° .
[15]
Kappa1 CrA has a
stellar classification of A0 IV,
[3] indicating that it is a slightly evolved
A-type star . At present it has 2.8 times the
mass of the Sun and a slightly enlarged
radius of 3.79
R ☉ .
[6] It radiates at 179 times the
luminosity of the Sun
[6] from its
photosphere at an
effective temperature of 11,079
K .
[7] Kappa1 CrA's
metallicity – specifically the
iron abundance – is 63% that of the
Sun .
[8] With an age of about four million years, Kappa1 CrA is modelled to be a young star only about 10% of the way through its main sequence life.
[9]
References
^
a
b
c
d
e Vallenari, A.; et al. (Gaia collaboration) (2023).
"Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1.
arXiv :
2208.00211 .
Bibcode :
2023A&A...674A...1G .
doi :
10.1051/0004-6361/202243940 .
S2CID
244398875 .
Gaia DR3 record for this source at
VizieR .
^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27–L30.
Bibcode :
2000A&A...355L..27H .
ISSN
0004-6361 .
^
a
b Pickles, A.; Depagne, É. (December 2010).
"All-Sky Spectrally MatchedUBVRI - ZY and u ′ g ′ r ′ i ′ z ′ Magnitudes for Stars in the Tycho2 Catalog" . Publications of the Astronomical Society of the Pacific . 122 (898): 1437–1464.
arXiv :
1011.2020 .
Bibcode :
2010PASP..122.1437P .
doi :
10.1086/657947 .
eISSN
1538-3873 .
ISSN
0004-6280 .
^ Corben, P. M. (1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars".
Monthly Notes of the Astronomical Society of South Africa . 30 : 37.
Bibcode :
1971MNSSA..30...37C .
ISSN
0024-8266 .
^ Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007).
"Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations" . Astronomische Nachrichten . 328 (9): 889–896.
arXiv :
0705.0878 .
Bibcode :
2007AN....328..889K .
doi :
10.1002/asna.200710776 .
ISSN
0004-6337 .
^
a
b
c Stassun, Keivan G.; et al. (9 September 2019).
"The Revised TESS Input Catalog and Candidate Target List" . The Astronomical Journal . 158 (4): 138.
arXiv :
1905.10694 .
Bibcode :
2019AJ....158..138S .
doi :
10.3847/1538-3881/ab3467 .
ISSN
0004-6256 .
^
a
b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012).
"Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos" . 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 .
ISSN
0035-8711 .
^
a
b Anders, F.; et al. (February 2022).
"Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5" . Astronomy & Astrophysics . 658 : A91.
arXiv :
2111.01860 .
Bibcode :
2022A&A...658A..91A .
doi :
10.1051/0004-6361/202142369 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^
a
b Zorec, J.; Royer, F. (January 2012).
"Rotational velocities of A-type stars IV: Evolution of rotational velocities" . Astronomy & Astrophysics . 537 : A120.
arXiv :
1201.2052 .
Bibcode :
2012A&A...537A.120Z .
doi :
10.1051/0004-6361/201117691 .
eISSN
1432-0746 .
ISSN
0004-6361 .
S2CID
55586789 .
^ Tetzlaff, N.; et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society . 410 (1): 190–200.
arXiv :
1007.4883 .
Bibcode :
2011MNRAS.410..190T .
doi :
10.1111/j.1365-2966.2010.17434.x .
S2CID
118629873 .
^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino . 1 .
Bibcode :
1879RNAO....1.....G .
^
"kap01 CrA" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved August 1, 2022 .
^ van Leeuwen, F. (13 August 2007).
"Validation of the new Hipparcos reduction" . Astronomy & Astrophysics . 474 (2): 653–664.
arXiv :
0708.1752 .
Bibcode :
2007A&A...474..653V .
doi :
10.1051/0004-6361:20078357 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^ Makarov, Valeri V. (2020).
"Two-epoch Orbit Estimation for Wide Binaries Resolved in Hipparcos and Gaia" . The Astronomical Journal . 160 (6): 284.
arXiv :
2010.03628 .
Bibcode :
2020AJ....160..284M .
doi :
10.3847/1538-3881/abbe1c .
S2CID
222209002 .
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001).
"The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466–3471.
Bibcode :
2001AJ....122.3466M .
doi :
10.1086/323920 .
ISSN
0004-6256 .
External links