HR 4180

HR 4180 is a double star with components HD 92449 and HD 92463 in the southern constellation of Vela. They are probably members of a binary star system.[7] HR 4180 can be viewed with the naked eye, having an apparent visual magnitude of 4.29.[2] Based upon an annual parallax shift of 5.1 mas,[1] it is located 640 light years from the Sun. The system is moving further from the Earth with a heliocentric radial velocity of +20 km/s.[5]

HD 92449
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 10h 39m 18.39150s[1]
Declination −55° 36′ 11.7624″[1]
Apparent magnitude (V) 4.29[2]
Characteristics
Spectral type G5 IIa[3] + B8 V[4]
B−V color index 1.025±0.003[2]
Astrometry
A
Radial velocity (Rv)+20.1±0.7[5] km/s
Proper motion (μ) RA: −18.412[1] mas/yr
Dec.: +4.880[1] mas/yr
Parallax (π)5.0616 ± 0.2371[1] mas
Distance640 ± 30 ly
(198 ± 9 pc)
Absolute magnitude (MV)−2.76[2]
B
Proper motion (μ) RA: −19.178[1] mas/yr
Dec.: +5.524[1] mas/yr
Parallax (π)4.3859 ± 0.0673[1] mas
Distance740 ± 10 ly
(228 ± 3 pc)
Details
Luminosity1370.29[6] L☉
Temperature5,100[6] K
Other designations
x Vel, HR 4180, WDS J10393-5536
A: CD−54 3915, HD 92449, HIP 52154, SAO 238309
B: CD−54 3675, HD 92463, SAO 238313
Database references
SIMBADHD 92449
HD 92463

The primary component of this system, HD 92449, is a bright giant with a stellar classification of G5 IIa.[3] The star radiates 1,370 times the Sun's luminosity from its photosphere at an effective temperature of 5,100 K.[6] It shares a common proper motion with the magnitude 6.06[8] star HD 92463,[9] and the pair likely form a binary system.[7] This secondary component is a B-type main-sequence star with a class of B8 V.[4] As of 2000, it had an angular separation of 51.70″ along a position angle of 105° from the primary.[8]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. 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. Cite journal requires |journal= (help)
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics. 546: 14. arXiv:1208.3048. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219. A61.
  6. McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427: 343, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  7. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  8. Mason, B. D.; et al. (2008). "Washington Visual Double Star Catalog, 2006.5 (WDS)". U. S. Naval Observatory, Washington D.C. Archived from the original on 2011-02-14. Retrieved 2018-08-13.
  9. Eggen, O. J. (June 15, 1980). "VY Carinae, S Normae, and photometric luminosities for bright giants and supergiants of types G and K". Astrophysical Journal, Part 1. 238: 919–928. Bibcode:1980ApJ...238..919E. doi:10.1086/158055.
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