HD 156768

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HD 156768
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 22m 55.22084s[1]
Declination −58° 00′ 37.1661″[1]
Apparent magnitude (V) 5.86[2] (6.1 + 9.6)[3]
Spectral type G8Ib/II[4]
U−B color index +0.86[5]
B−V color index +1.07[5]
Radial velocity (Rv) −9.8±0.2[2] km/s
Proper motion (μ) RA: −6.52[1] mas/yr
Dec.: −14.35[1] mas/yr
Parallax (π) 2.98 ± 0.52[1] mas
Distance approx. 1,100 ly
(approx. 340 pc)
HD 156768 A
Luminosity 616[6] L
Temperature 4,798[6] K
Rotational velocity (v sin i) 2.6±1.0[7] km/s
Other designations
HD 156768, HIP 85049, HR 6438, SAO 244678.
Database references

HD 156768 is a double star in the southern constellation of Ara. The brighter component is a sixth magnitude bright giant or supergiant star with a stellar classification of G8Ib/II.[4] The magnitude 9.6 companion lies at an angular separation of 1.81 along a position angle of 184°.[3]


  1. ^ a b c d e van Leeuwen, F. (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. ^ a b Gontcharov, G. A. (November 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. doi:10.1134/S1063773706110065. 
  3. ^ a b Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics 356: 141–145, Bibcode:2000A&A...356..141F. 
  4. ^ a b 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, Bibcode:1978mcts.book.....H. 
  5. ^ a b Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode:1978A&AS...34....1N 
  6. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x 
  7. ^ De Medeiros, J. R.; et al. (November 2002), "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars", Astronomy and Astrophysics 395: 97–98, Bibcode:2002A&A...395...97D, doi:10.1051/0004-6361:20021214 

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