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HD 189733 b

HD 189733 b
Exoplanet List of exoplanets
Exoplanet Comparison HD 189733 b.png
Size comparison of HD 189733 b with Jupiter.
Parent star
Star HD 189733 A
Constellation Vulpecula
Right ascension (α) 20h 00m 43.71s
Declination (δ) +22° 42′ 39.1″
Apparent magnitude (mV) 7.66
Distance 63.4 ± 0.9 ly
(19.5 ± 0.3 pc)
Spectral type K1–2V
Mass (m) 0.846+0.068
−0.049
 M
Radius (r) 0.805±0.016 R
Temperature (T) 4875±43 K
Metallicity [Fe/H] −0.03 ± 0.04
Age 4.3±2.8 Gyr
Orbital elements
Semi-major axis (a) 0.03099 ± 0.0006 AU
(4.636 ± 0.09 Gm)
Periastron (q) 0.03096 AU
(4.632 Gm)
Apastron (Q) 0.03102 AU
(4.641 Gm)
Eccentricity (e) 0.0010 ± 0.0002
Orbital period (P) 2.2185733 ± 0.00002 d
    (53.245759 h)
Orbital speed (υ) 152.5 km/s
Inclination (i) 85.76 ± 0.29°
Time of transit (Tt) 2,453,988.80336 ± 0.00024 JD
Semi-amplitude (K) 205 ± 6 m/s
Physical characteristics
Mass (m) 1.162+0.058
−0.039
MJ
Radius (r) 1.138 ± 0.027 RJ
Stellar flux (F) 275
Geometric Albedo (Ag) 0.40 ± 0.12 (290–450 nm)
< 0.12 (450–570 nm)
Surface gravity (g) 21.2 m/s²
Temperature (T) 1117 ± 42 K
Discovery information
Discovery date 5 October 2005
Discoverer(s) Bouchy et al.
Discovery method Doppler spectroscopy
Transit
Other detection methods Polarimetry
Reflection/emission modulations
Discovery site Haute-Provence Observatory
Discovery status Confirmed
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBAD data
Exoplanet Archive data
Open Exoplanet Catalogue data

HD 189733 b is an extrasolar planet approximately 63 light-years away from the Solar System in the constellation of Vulpecula. The planet was discovered orbiting the star HD 189733 A on October 5, 2005, when astronomers in France observed the planet transiting across the face of the star. With a mass 13% higher than that of Jupiter, HD 189733 b orbits its host star once every 2.2 days at an orbital speed of 152.5 kilometres per second (341,000 mph), making it a hot Jupiter with poor prospects for extraterrestrial life. Being the closest transiting hot Jupiter to Earth, HD 189733 b is a subject for extensive atmospheric examination. HD 189733 b was the first extrasolar planet for which a thermal map was constructed, to be detected through polarimetry, to have its overall color determined (deep blue), to have a transit detected in X-ray spectrum and to have carbon dioxide detected in its atmosphere.

In July, 2014, NASA announced finding very dry atmospheres on three exoplanets (HD 189733b, HD 209458b, WASP-12b) orbiting Sun-like stars.

On October 6, 2005, a team of astronomers announced the discovery of transiting planet HD 189733 b. The planet was then detected using Doppler spectroscopy. Real-time radial velocity measurements detected the Rossiter–McLaughlin effect caused by the planet passing in front of its star before photometric measurements confirmed that the planet was transiting. In 2006, a team led by Drake Deming announced a detection of strong infrared thermal emission from the transiting extrasolar planet HD 189733 b, by measuring the flux decrement (decrease of total light) during its prominent secondary eclipse (when the planet passes behind the star).


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