Eta1 Coronae Australis

From Wikipedia, the free encyclopedia
  (Redirected from Eta¹ Coronae Australis)
Jump to: navigation, search
η1 Coronae Australis
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Australis
Right ascension 18h 48m 50.48994s[1]
Declination −43° 40′ 48.1591″[1]
Apparent magnitude (V) 5.456[2]
Spectral type A3V[3]
B−V color index +0.13[4]
Radial velocity (Rv) −4.00 ± 4.2[5] km/s
Proper motion (μ) RA: 23.89[1] mas/yr
Dec.: −19.32[1] mas/yr
Parallax (π) 9.70 ± 0.71[1] mas
Distance 340 ± 20 ly
(103 ± 8 pc)
Absolute magnitude (MV) 0.84[6]
Surface gravity (log g) 4.04[6] cgs
Temperature 8371+4692
[7] K
Rotational velocity (v sin i) 122.3[3] km/s
Other designations
CD−43° 12841, FK5 1490, HD 173715, HIP 92308, HR 7062, SAO 229299
Database references

Eta1 Coronae Australis1 CrA) is a star located in the constellation Corona Australis. Its apparent magnitude is 5.456.[2] Parallax measurements by Hipparcos put it at a distance of 340 light-years, or 103 parsecs, away.[1]

Eta1 Coronae Australis is an A-type main-sequence star with an effective temperature of 8371 K.[7] It has broad spectrum absorption lines associated with its rotation period.[3]


  1. ^ a b c d e f van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357. 
  2. ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. 
  3. ^ a b c Díaz, C. G.; González, J. F.; Levato, H.; Grosso, M. (2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. Bibcode:2011A&A...531A.143D. arXiv:1012.4858Freely accessible. doi:10.1051/0004-6361/201016386. 
  4. ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J. 
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. Bibcode:2006AstL...32..759G. arXiv:1606.08053Freely accessible. doi:10.1134/S1063773706110065. 
  6. ^ a b Philip, A. Davis; Egret, D. (1980). "An Analysis of the Hauck / Mermilliod Catalogue of Homgeneous Four-Color Data - Part Two". Astronomy and Astrophysics Supplement. 40: 199. Bibcode:1980A&AS...40..199P. 
  7. ^ a b Ammons, S. Mark; Robinson, Sarah E.; Strader, Jay; Laughlin, Gregory; Fischer, Debra; Wolf, Aaron (2006). "The N2K Consortium. IV. New Temperatures and Metallicities for More than 100,000 FGK Dwarfs". The Astrophysical Journal. 638 (2): 1004. Bibcode:2006ApJ...638.1004A. arXiv:astro-ph/0510237Freely accessible. doi:10.1086/498490.