Eta2 Coronae Australis

η2 Coronae Australis
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Australis
Right ascension 18h 49m 34.99623s[1]
Declination −43° 26′ 02.7673″[1]
Apparent magnitude (V) 5.587[2]
Characteristics
Spectral type B9IV[3]
B−V color index −0.08[4]
Astrometry
Radial velocity (Rv)−23.00 ± 4.3[5] km/s
Proper motion (μ) RA: −2.32[1] mas/yr
Dec.: −25.49[1] mas/yr
Parallax (π)6.77 ± 0.34[1] mas
Distance480 ± 20 ly
(148 ± 7 pc)
Absolute magnitude (MV)−0.75[6]
Details[7]
Mass3.23 ± 0.08 M☉
Luminosity171 L☉
Temperature10940 K
Rotational velocity (v sin i)30 km/s
Other designations
CD−43° 12854, HD 173861, HIP 92382, HR 7068, SAO 229307
Database references
SIMBADdata

Eta2 Coronae Australis (η2 CrA), is a star located in the constellation Corona Australis. Its apparent magnitude is 5.587.[2] Parallax measurements by Hipparcos put the system at about 480 light-years, or 148 parsecs, away.[1]

Eta2 Coronae Australis is a B-type subgiant star[3] with an effective temperature of about 11,000 K.[7] It has an absolute magnitude of −0.75,[6] and a mass of 3.23 times that of the Sun. It is 171 times as luminous as the Sun.[7]

Sources

  1. 1 2 3 4 5 6 van Leeuwen, F.; et al. (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.
  2. 1 2 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. 1 2 Houk, N. (1987). "Michigan Catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
  4. ↑ Corben, P. M.; Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of Southern Africa. 27: 11. Bibcode:1968MNSSA..27...11C.
  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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. 1 2 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. 1 2 3 Zorec, J.; Royer, F. (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.


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