Back HD 188753 Afrikaans HD 188753 AST HD 188753 German HD 188753 Spanish اچدی ۱۸۸۷۵۳ Persian HD 188753 Finnish HD 188753 French HD 188753 Italian HD 188753 Japanese HD 188753 Korean
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 54m 58.37177s[1] |
| Declination | +41° 52′ 17.5298″[1] |
| Apparent magnitude (V) | +7.43[2] |
| Characteristics | |
| Spectral type | A: G8V[3] |
| U−B color index | +0.42[2] |
| B−V color index | +0.79[2] |
| Astrometry | |
| Radial velocity (Rv) | -23.5[4] km/s |
| Proper motion (μ) | RA: -51.32[1] mas/yr Dec.: 286.57 [1] mas/yr |
| Parallax (π) | 21.63 ± 0.65 mas[1] |
| Distance | 151 ± 5 ly (46 ± 1 pc) |
| Absolute magnitude (MV) | 4.17[citation needed] |
| Orbit[5] | |
| Primary | HD 188753 A |
| Companion | HD 188753 BC |
| Period (P) | 25.63 yr |
| Semi-major axis (a) | 0.2587" (11.8 au) |
| Eccentricity (e) | 0.502 |
| Inclination (i) | 31.1° |
| Longitude of the node (Ω) | 45.7° |
| Periastron epoch (T) | 1988.1 |
| Argument of periastron (ω) (secondary) | 233.3° |
| Semi-amplitude (K1) (primary) | 4.8 km/s |
| Semi-amplitude (K2) (secondary) | 3.4 km/s |
| Details | |
| Mass | A: 1.06 ± 0.07[6] M☉ B: 0.96 ± 0.05[6] M☉ C: 0.67 ± 0.05[6] M☉ |
| Temperature | A: 5,750[3] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 188753 is a hierarchical triple star system approximately 151 light-years away in the constellation of Cygnus, the Swan. In 2005, an extrasolar planet was announced to be orbiting the primary star (designated HD 188753 A) in the system. Follow-up measurements by an independent group in 2007 did not confirm the planet's existence.[8]
- ^ a b c d e Cite error: The named reference
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rgcrvwas invoked but never defined (see the help page). - ^ Marcadon, F.; Appourchaux, T.; Marques, J. P. (2018). "Asteroseismic and orbital analysis of the triple star system HD 188753 observed by Kepler". Astronomy and Astrophysics. 617: A2. arXiv:1804.09296. Bibcode:2018A&A...617A...2M. doi:10.1051/0004-6361/201731628. S2CID 56108054.
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