| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 55m 19.50021s[1] |
| Declination | −06° 44′ 05.2223″[1] |
| Apparent magnitude (V) | 6.51[2] (6.94 + 7.98)[3] |
| Characteristics | |
| Spectral type | F2V[3] |
| U−B color index | +0.05[2] |
| B−V color index | +0.39[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.10[4] km/s |
| Proper motion (μ) | RA: +16.58[1] mas/yr Dec.: −60.18[1] mas/yr |
| Parallax (π) | 12.22 ± 0.84 mas[1] |
| Distance | 270 ± 20 ly (82 ± 6 pc) |
| Orbit[5] | |
| Period (P) | 425 ± 22 yr |
| Semi-major axis (a) | 1.085 ± 0.024″ |
| Eccentricity (e) | 0.9414 ± 0.0020 |
| Inclination (i) | 103.05 ± 0.84° |
| Longitude of the node (Ω) | 264.03 ± 0.77° |
| Periastron epoch (T) | B 1974.28 ± 0.23 |
| Argument of periastron (ω) (secondary) | 327.9 ± 1.7° |
| Details | |
| HD 188405 A | |
| Mass | 1.4[6] M☉ |
| Radius | 2.8[6] R☉ |
| Luminosity | 13[6] L☉ |
| Temperature | 6,646[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 188405 is a binary star in the equatorial constellation of Aquila. The pair have an orbital period of roughly 425 years and an angular separation of 1.085″.[7]
van Leeuwen2007 was invoked but never defined (see the help page).aass34_1 was invoked but never defined (see the help page).aa546_A69_5 was invoked but never defined (see the help page).Gontcharov was invoked but never defined (see the help page).Cvetkovic2010 was invoked but never defined (see the help page).