HD 205765

HD 205765
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	21h 37m 33.77302s
Declination	−00° 23′ 25.7789″
Apparent magnitude (V)	6.2491
Characteristics
Spectral type	A2V
U−B color index	+0.055
B−V color index	+0.055
Astrometry
Radial velocity (Rv)	+16.9 km/s
Proper motion (μ)	RA: +177 mas/yr ; Dec.: −109 mas/yr
Parallax (π)	8.86 ± 0.39 mas
Distance	370 ± 20 ly ; (113 ± 5 pc)
Details
Radius	1.7 R☉
Rotational velocity (v sin i)	172.2±2.2 km/s
Other designations
	BD-01° 4180, HD 205765, HIP 106758, HR 8263, SAO 145533.
Database references
SIMBAD	data

HD 205765 is a star in the equatorial constellation of Aquarius. It is an A-type main sequence star with an apparent magnitude of 6.2, which, according to the Bortle scale, makes it faintly visible to the naked eye from dark rural skies. This star is spinning rapidly with a projected rotational velocity of 172 km/s.^[6]

References

^ ^a ^b ^c ^d ^e ^f 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
^ 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
^ ^a ^b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
^ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W
^ 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: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451
^ ^a ^b Díaz, 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

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Observation data Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	21^h 37^m 33.77302^s^[1]
Declination	−00° 23′ 25.7789″^[1]
Apparent magnitude (V)	6.2491^[1]
Characteristics
Spectral type	A2V^[2]
U−B color index	+0.055^[3]
B−V color index	+0.055^[3]
Astrometry

Radial velocity (R_v)	+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]
Distance	370 ± 20 ly (113 ± 5 pc)

Details

Radius	1.7^[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
SIMBAD	data