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]
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]