Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 37m 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 telescopes at Lick 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 | — | — |