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HD 205765

From Wikipedia, the free encyclopedia
Star in the constellation Aquarius
HD 205765
Observation data
Epoch J2000      Equinox J2000
ConstellationAquarius
Right ascension21h 37m 33.77302s[1]
Declination−00° 23′ 25.7789″[1]
Apparent magnitude (V)6.2491[1]
Characteristics
Spectral typeA2V[2]
U−Bcolor index+0.055[3]
B−Vcolor index+0.055[3]
Astrometry
Radial velocity (Rv)+16.9[4] km/s
Proper motion (μ)RA: +177[1]mas/yr
Dec.: −109[1]mas/yr
Parallax (π)8.86±0.39 mas[1]
Distance370 ± 20 ly
(113 ± 5 pc)
Details
Radius1.7[5] R
Rotational velocity (v sin i)172.2±2.2[6] km/s
Other designations
BD-01° 4180,HD 205765,HIP 106758,HR 8263,SAO 145533.
Database references
SIMBADdata

HD 205765 is astar in the equatorialconstellation ofAquarius. It is anA-type main sequence star with anapparent magnitude of 6.2, which, according to theBortle scale, makes it faintly visible to the naked eye from dark rural skies. This star is spinning rapidly with aprojected rotational velocity of 172 km/s.[6]

References

[edit]
  1. ^abcdefvan 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,S2CID 18759600
  2. ^Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications",Astronomical Journal,74:375–406,Bibcode:1969AJ.....74..375C,doi:10.1086/110819
  3. ^abMermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data. SIMBAD,Bibcode:1986EgUBV........0M
  4. ^Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities",Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C.,Bibcode:1953GCRV..C......0W
  5. ^Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics",Astronomy & Astrophysics,367 (2):521–24,arXiv:astro-ph/0012289,Bibcode:2001A&A...367..521P,doi:10.1051/0004-6361:20000451,S2CID 425754
  6. ^abDíaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum",Astronomy & Astrophysics,531: A143,arXiv:1012.4858,Bibcode:2011A&A...531A.143D,doi:10.1051/0004-6361/201016386,S2CID 119286673

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