HD 205765
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | 21h 37m 33.76260s[2] |
| Declination | −00° 23′ 26.0225″[2] |
| Apparent magnitude (V) | 6.22[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2][3] |
| Spectral type | A2V[4] |
| U−B color index | +0.055[5] |
| B−V color index | +0.055[5] |
| Astrometry | |
| Radial velocity (Rv) | +16.9[6] km/s |
| Proper motion (μ) | RA: −31.305[2] mas/yr Dec.: −28.242[2] mas/yr |
| Parallax (π) | 8.8688±0.0445 mas[2] |
| Distance | 368 ± 2 ly (112.8 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.96[1] |
| Details | |
| Mass | 2.3[3][2] M☉ |
| Radius | 2.4[7] R☉ |
| Luminosity | 43[3] L☉ |
| Temperature | 8,954[3] K |
| Metallicity [Fe/H] | −0.17[8] dex |
| Rotational velocity (v sin i) | 191[3] km/s |
| Age | 476[2] Myr |
| 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.[9]
The Washington Double Star Catalog lists a 9th-magnitude companion at 31″ and a 14th-magnitude companion at 38″.[10] The brighter and closer star shares a common proper motion and distance with HD 205765,[11] while the fainter and more widely-separated star has a much smaller parallax.[12]
References
- ^ a b c 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.
- ^ a b c d e f g h Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
- ^ 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 Washington D.C. Publication. Carnegie Institute of Washington D.C. Bibcode:1953GCRV..C......0W.
- ^ Doyle, Lauren; Armstrong, David J.; Bayliss, Daniel; Rodel, Toby; Kunovac, Vedad (2024). "The TESS-SPOC FFI target sample explored with Gaia". Monthly Notices of the Royal Astronomical Society. 529 (2): 1802. arXiv:2403.02407. Bibcode:2024MNRAS.529.1802D. doi:10.1093/mnras/stae616.
- ^ Marsakov, V. A.; Shevelev, Yu. G. (1995). "Catalogue of ages, metallicities, orbital elements and other parameters for nearby F stars". Bulletin d'Information du Centre de Donnees Stellaires. 47: 13. Bibcode:1995BICDS..47...13M.
- ^ 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. S2CID 119286673.
- ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.