HD 205765
Star in the constellation Aquarius
From Wikipedia, the free encyclopedia
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]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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 |
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]