Kappa2 Coronae Australis

Kappa2 Coronae Australis is a star in the southern constellation of Corona Australis. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.67.[2] The distance to this star is approximately 700 light years based on parallax.[1] The radial velocity is poorly constrained, but the star appears to be moving closer with a radial velocity of around −15 km/s.[2]

For other star systems with this Bayer designation see κ Coronae Australis
Kappa2 Coronae Australis
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Australis
Right ascension  18h 33m 23.13075s[1]
Declination −38° 43′ 33.5408″[1]
Apparent magnitude (V) 5.67[2]
Characteristics
Spectral type B9V[3]
B−V color index −0.060±0.020[2]
Astrometry
Radial velocity (Rv)−15.0±7.4[2] km/s
Proper motion (μ) RA: −2.505[1] mas/yr
Dec.: -20.368[1] mas/yr
Parallax (π)4.6899 ± 0.1269[1] mas
Distance700 ± 20 ly
(213 ± 6 pc)
Details
Luminosity460.39[4] L☉
Temperature9,844[4] K
Other designations
κ2 CrA, CD−38°12895, GC 25314, HD 170868, HIP 90968, HR 6953, SAO 210294, CCDM J18334-3843A, WDS J18334-3844A[5]
Database references
SIMBADdata

This object is a late B-type main-sequence star with a stellar classification of B9V.[3] It is radiating 460 times the luminosity of the Sun from its photosphere at an effective temperature of 9,844 K.[4] Kappa2 Coronae Australis forms a visual double star with Kappa1 Coronae Australis, also known as HR 6952. 1 and 2 are located at 21.4 arcminutes from each other. The double is only in the line of sight, however, as Kappa1 is much more distant than the dimmer and closer Kappa2.

References
  1. 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.
  2. 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.
  3. Buscombe, William (1969), "Line strengths for southern OB stars-II. Observations with moderate dispersion", Monthly Notices of the Royal Astronomical Society, 144: 31, Bibcode:1969MNRAS.144...31B, doi:10.1093/mnras/144.1.31
  4. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  5. "kap02 CrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-20.
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