Alpha Coronae Australis

α Coronae Australis
Location of α CrA (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 19h 09m 28.34097s[1]
Declination –37° 54′ 16.1022″[1]
Apparent magnitude (V) 4.102[2]
Characteristics
Spectral type A2V[3]
U−B color index +0.06[4]
B−V color index +0.04[4]
Astrometry
Radial velocity (Rv)−18.40±1.78[5] km/s
Proper motion (μ) RA: 84.87[1] mas/yr
Dec.: −95.99[1] mas/yr
Parallax (π)26.02 ± 0.25 mas[1]
Distance125 ± 1 ly
(38.4 ± 0.4 pc)
Absolute magnitude (MV)1.11[6]
Details
Mass2.57[7] M☉
Radius2.21[3] R☉
Luminosity31[8] L☉
Surface gravity (log g)4.08[7] cgs
Temperature9,916±337[7] K
Rotational velocity (v sin i)195[9] km/s
Age254[2] Myr
Other designations
Meridiana, α CrA, Alf CrA, CD−38° 13350, FK5 718, GC 26360, HD 178253, HIP 94114, HR 7254, SAO 210990, IRAS 19060-3759, 2MASS J19092834-3754157[4]
Database references
SIMBADdata

Alpha Coronae Australis or α Coronae Australis, officially named Meridiana (/məˌrɪdiˈænə/),[10] is the brightest star in the constellation of Corona Australis and is located about 125 light-years from Earth.

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  2. ^ a b Song, Inseok; et al. (February 2001), "Ages of A-Type Vega-like Stars from uvbyβ Photometry", The Astrophysical Journal, 546 (1): 352–357, arXiv:astro-ph/0010102, Bibcode:2001ApJ...546..352S, doi:10.1086/318269, S2CID 18154947
  3. ^ a b Cotten, Tara H.; Song, Inseok (July 2016). "A Comprehensive Census of Nearby Infrared Excess Stars". The Astrophysical Journal Supplement Series. 225 (1): 24. arXiv:1606.01134. Bibcode:2016ApJS..225...15C. doi:10.3847/0067-0049/225/1/15. S2CID 118438871. 15.
  4. ^ a b c "* alf CrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-09-02.
  5. ^ Kharchenko, N. V.; et al. (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. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  6. ^ "α Coronae Australis (star)". Wolfram Alpha. Retrieved 2012-09-02.
  7. ^ a b c David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
  8. ^ Cite error: The named reference KALER was invoked but never defined (see the help page).
  9. ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007). "Rotational velocities of A-type stars. III. Velocity distributions". Astronomy and Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. S2CID 18475298.
  10. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.