Astronomy:HD 156768

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HD 156768
Observation data
Equinox J2000.0]] (ICRS)
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]
Characteristics
Spectral type G8Ib/II[4]
U−B color index +0.86[5]
B−V color index +1.07[5]
Astrometry
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
Distanceapprox. 1,100 ly
(approx. 340 pc)
Details
HD 156768 A
Luminosity616[6] L
Temperature4,798[6] K
Rotational velocity (v sin i)2.6±1.0[7] km/s
Other designations
CPD−57° 8478, HD 156768, HIP 85049, HR 6438, SAO 244678.
Database references
SIMBADdata

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]

References

  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 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. doi:10.1134/S1063773706110065. Bibcode2006AstL...32..759G. 
  3. 3.0 3.1 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, Bibcode2000A&A...356..141F. 
  4. 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor : Dept. of Astronomy (Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan) 1, Bibcode1978mcts.book.....H. 
  5. 5.0 5.1 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode1978A&AS...34....1N 
  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 
  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, doi:10.1051/0004-6361:20021214, Bibcode2002A&A...395...97D 

External links