NASA Hubble Finds a True Blue Planet · NASA · NASA — public domain
Astronomical data · SIMBAD
- Object type
- Pl
- Distance
- 65 light-years
- Coordinates
- RA 300.1821° · Dec 22.7109°
via SIMBAD · CDS Strasbourg
Key facts
- Discovered by
- Bouchy et al.
- Discovery site
- Haute-Provence Observatory
- Discovery date
- October 5, 2005
- Detection method
- Doppler spectroscopy , Transit
- Semi major axis
- 0.03100 ± 0.0006 AU (4,638,000 ± 90,000 km)
- Eccentricity
- <0.0039
- Orbital period sidereal
- 2.218 575 200 (77) d , 53.2458048 h
- Average orbital speed
- 152.0 km/s
- Inclination
- 85.580° ± 0.060°
- Semi amplitude
- 201.3 ± 1.6 m/s
- Star
- HD 189733
- Mean radius
- 1.138 ± 0.027 R J
- Mass
- 1.123 ± 0.045 M J
- Mean density
- 0.943 +0.081, −0.072 g/cm
- Surface gravity
- 21.5 m/s (2.2 g )
- Albedo
- 0.40 ± 0.12 (290–450 nm) , <0.12 (450–570 nm) , 0.076 ± 0.016 ( geometric )
- Temperature
- 1,192 ± 9 K (919 °C; 1,686 °F) , 1,490 ± 68 K (1,220 °C; 2,220 °F)
via Wikipedia infobox
Exoplanet data
- Host star
- HD 189733
- Discovered
- 2005
- Discovered by
- Haute-Provence Observatory
- Orbital period
- 2.22 days
- Radius
- 12.67 × Earth
- Mass
- 359.15 × Earth
- Equilibrium temp
- 1209 K
- Distance
- 19.76 pc
via NASA Exoplanet Archive
~14 min read
Encyclopedic overview
HD 189733 b is an exoplanet in the constellation of Vulpecula approximately 64.5 light-years (19.8 parsecs) away from the Solar System. Astronomers in France discovered the planet orbiting the star HD 189733 on October 5, 2005, by observing its transit across the star's face. With a mass 11.2% higher than that of Jupiter and a radius 11.4% greater, HD 189733 b orbits its host star once every 2.2 days at an orbital speed of 152.0 kilometers per second (340,000 miles per hour), making it a hot Jupiter with poor prospects for extraterrestrial life.
The closest transiting hot Jupiter to Earth, HD 189733 b has been the subject of close atmospheric observation. Scientists have studied it with high- and low-resolution instruments, both from the ground and from space. Researchers have found that the planet's weather includes raining molten glass. HD 189733 b was also the first exoplanet to have its thermal map constructed, possibly to be detected through polarimetry, its overall color determined (deep blue), its transit viewed in the X-ray spectrum, and to have carbon dioxide confirmed as being present in its atmosphere.
Excerpted from Wikipedia’s “HD 189733 b” article, available under the CC BY-SA 4.0 licence.