Astronomy:HD 158220

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HD 158220
Observation data
Equinox J2000.0]] (ICRS)
Constellation Ara
Right ascension  17h 31m 23.28387s[1]
Declination −56° 55′ 15.4672″[1]
Apparent magnitude (V) 5.95[2]
Spectral type B7II-III[3]
B−V color index −0.08[2]
Variable type Be star[4]
Radial velocity (Rv)-3[5] km/s
Proper motion (μ) RA: −0.29[1] mas/yr
Dec.: −3.72[1] mas/yr
Parallax (π)1.78 ± 0.34[1] mas
Distanceapprox. 1,800 ly
(approx. 600 pc)
Luminosity1,176[6] L
Temperature9,657[6] K
Other designations
V862 Arae, CD-56° 6893, HD 158220, HIP 85751, HR 6505, SAO 244808.
Database references

HD 158220 is a giant Be star in the southern constellation of Ara. This is a pulsating variable star that changes brightness by an amplitude of 0.030 magnitude over a period of 1.15 days.[4]


  1. 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode2007A&A...474..653V. 
  2. 2.0 2.1 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99), Bibcode1966CoLPL...4...99J 
  3. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 
  4. 4.0 4.1 Percy, John R. et al. (February 2004), "Short-Period Variable Be Stars Discovered or Confirmed through Self-Correlation Analysis of Hipparcos Epoch Photometry", The Publications of the Astronomical Society of the Pacific 116 (816): 178–183, doi:10.1086/382246, Bibcode2004PASP..116..178P 
  5. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode1953GCRV..C......0W 
  6. 6.0 6.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode2012MNRAS.427..343M 

External links