HD 185269
Triple star system in the constellation Cygnus
From Wikipedia, the free encyclopedia
HD 185269 is a stellar triple system[7] approximately 170 light-years away in the constellation Cygnus. It is easily visible to binoculars, but not the naked eye.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 37m 11.74116s[2] |
| Declination | +28° 29′ 59.5070″[2] |
| Apparent magnitude (V) | 6.67[3] |
| Characteristics | |
| Evolutionary stage | subgiant[4] |
| Spectral type | G0IV[3] |
| B−V color index | 0.58[3] |
| Astrometry | |
| Proper motion (μ) | RA: −31.563[2] mas/yr Dec.: −81.082[2] mas/yr |
| Parallax (π) | 19.2423±0.0182 mas[2] |
| Distance | 169.5 ± 0.2 ly (51.97 ± 0.05 pc) |
| Absolute magnitude (MV) | 3.29[3] |
| Absolute bolometric magnitude (Mbol) | 3.228[3] |
| Details | |
| Mass | 1.33[3] M☉ |
| Radius | 2.1[2] R☉ |
| Luminosity | 4.8[2] L☉ |
| Surface gravity (log g) | 4.05[3] cgs |
| Temperature | 5,983[3] K |
| Metallicity [Fe/H] | 0.10[3] dex |
| Rotation | 29.5[5] days |
| Rotational velocity (v sin i) | 5.5[3] km/s |
| Age | 4.0[3] Gyr |
| Other designations | |
| BD+28°3412, HIP 96507, SAO 87464[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The primary star is a third more massive[3] and nearly five times as luminous than the Sun.[2] The spectrum of the star is G0IV.[3] 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☉.[7]
Planetary system
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 telescopes at Lick Observatory in California.[3][4] 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 | — | — |
