Pi Arae

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Pi Arae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ara
Right ascension 17h 38m 05.51512s[1]
Declination –54° 30′ 01.5643″[1]
Apparent magnitude (V) +5.25[2]
Distance 145.5 ± 1.6 ly
(44.6 ± 0.5[1] pc)
Spectral type A5 IV-V[3]
Other designations
CP-54 8403, Gl 683, HD 159492, HIP 86305, HR 6549, SAO 244896.[4]

Pi Arae (π Ara, π Arae) is the Bayer designation for a star in the southern constellation of Ara. It is approximately 145.5 light-years (44.6 parsecs) from Earth[1] and has an apparent visual magnitude of +5.25[2] The stellar classification of this star is A5 IV-V,[3] with the spectrum showing features of both a main sequence and a subgiant star. Pi Arae is roughly 170 million years old. It displays an excess emission of infrared radiation, which may be explained by a circumstellar disk of dust.[5]


  1. ^ a b c d van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J. 
  3. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H. 
  4. ^ "HR 6549 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-31 
  5. ^ Morales, Farisa Y.; et al. (April 2011), "Common Warm Dust Temperatures Around Main-sequence Stars", The Astrophysical Journal Letters, 730 (2): L29, Bibcode:2011ApJ...730L..29M, doi:10.1088/2041-8205/730/2/L29. 

External links[edit]