19h37m11.7408s, +28° 29′ 59.509″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h37m 11.7411s[1] |
| Declination | +28° 29′ 59.5025″[1] |
| Apparent magnitude (V) | 6.67[2] |
| Characteristics | |
| Spectral type | G0IV[2] |
| B−V color index | 0.58[2] |
| Astrometry | |
| Proper motion (μ) | RA: −31.499±0.045[1] mas/yr Dec.: −80.782±0.046[1] mas/yr |
| Parallax (π) | 19.2049 ± 0.0309 mas[1] |
| Distance | 169.8 ± 0.3 ly (52.07 ± 0.08 pc) |
| Absolute magnitude (MV) | 3.29[2] |
| Absolute bolometric magnitude (Mbol) | 3.228[2] |
| Details[2] | |
| Mass | 1.33 ± 0.07 M☉ |
| Surface gravity (log g) | 4.05 ± 0.22 cgs |
| Temperature | 5983 ± 62 K |
| Metallicity [Fe/H] | 0.10 ± 0.08 dex |
| Rotational velocity (v sin i) | 5.5 km/s |
| Age | 4.0 ± 1.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 185269 is a stellar triple system[4] approximately 170 light-years away in the constellation Cygnus. It is easily visible to binoculars, but not the naked eye.
The primary star is a third more massive[2] and four times more luminous than the Sun.[citation needed] The spectrum of the star is G0IV.[2] About 4.5 arcseconds away are the two other stars, which are much less massive than the Sun. The primary has a mass of 0.165 M☉, while the secondary has a mass of 0.154 M☉.[4]
The Jupiter-mass hot Jupiter was independently discovered orbiting the primary star by two different teams using doppler spectroscopy. One group led by Claire Moutou used the ELODIE spectrograph at the Haute-Provence Observatory in France while John Asher Johnson and collaborators used the Coudé Auxiliary and C. Donald Shane telescopesatLick Observatory in California.[2][5] The planet takes 6.8 days to orbit at 0.077 AU from the primary star in an eccentric orbit.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.010±0.014 MJ | 0.0770±0.0034 | 6.83776±0.00027 | 0.229±0.014 | — | — |
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