HD 209458 b

HD 209458bOsirisHD209458bOsiris (planet)
HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.wikipedia
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Jupiter

JovianGioveplanet Jupiter
Its mass is 220 times that of Earth (0.69 Jupiter masses) and its volume is some 2.5 times greater than that of Jupiter.
So, for example, the extrasolar planet HD 209458 b has a mass of, while Kappa Andromedae b has a mass of.

HD 189733 b

HD 189733bbHD189733b
In July, 2014, NASA announced finding very dry atmospheres on HD 209458 b and two other exoplanets (HD 189733 b and WASP-12b) orbiting Sun-like stars.
In July 2014, NASA announced finding very dry atmospheres on three exoplanets (HD 189733b, HD 209458b, WASP-12b) orbiting Sun-like stars.

WASP-12b

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

Pegasus (constellation)

PegasusPegasoPegasi
HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.
Spectroscopic analysis of HD 209458 b, an extrasolar planet in this constellation, has provided the first evidence of atmospheric water vapor beyond the solar system, while extrasolar planets orbiting the star HR 8799 also in Pegasus are the first to be directly imaged.

HD 209458

V376 Peg
HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.
The planet received the designation HD 209458 b.

Transit (astronomy)

transittransitingtransits
Astronomers had made careful photometric measurements of several stars known to be orbited by planets, in the hope that they might observe a dip in brightness caused by the transit of the planet across the star's face. Soon after the discovery, separate teams, one led by David Charbonneau including Timothy Brown and others, and the other by Gregory W. Henry, were able to detect a transit of the planet across the surface of the star making it the first known transiting extrasolar planet.
HD 209458b was the first such transiting planet to be detected.

Hot Jupiter

hot JupitersPuffy planetultra-short period planet
It had been previously hypothesized that hot Jupiters particularly close to their parent star should exhibit this kind of inflation due to intense heating of their outer atmosphere.

Spitzer Space Telescope

SpitzerSpitzer telescopeGLIMPSE
On March 22, 2005, NASA released news that infrared light from the planet had been measured by the Spitzer Space Telescope, the first ever direct detection of light from an extrasolar planet.
As one of its most noteworthy observations, in 2005, SST became the first telescope to directly capture light from exoplanets, namely the "hot Jupiters" HD 209458 b and TrES-1b, although it did not resolve that light into actual images.

Water vapor

water vapourvaporevaporation
On April 10, 2007, Travis Barman of the Lowell Observatory announced evidence that the atmosphere of HD 209458 b contained water vapor.
Spectroscopic analysis of HD 209458 b, an extrasolar planet in the constellation Pegasus, provides the first evidence of atmospheric water vapor beyond the Solar System.

Gregory W. Henry

G. Henry
Soon after the discovery, separate teams, one led by David Charbonneau including Timothy Brown and others, and the other by Gregory W. Henry, were able to detect a transit of the planet across the surface of the star making it the first known transiting extrasolar planet.
In 1999, Henry led one of two teams that discovered the first transiting extrasolar planet, HD 209458 b.

Atmosphere

atmosphericatmospheresplanetary atmospheres
* Atmosphere of HD 209458 b

Exoplanet

extrasolar planetexoplanetsplanet
In July, 2014, NASA announced finding very dry atmospheres on HD 209458 b and two other exoplanets (HD 189733 b and WASP-12b) orbiting Sun-like stars. HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.
In 2014, a magnetic field around HD 209458 b was inferred from the way hydrogen was evaporating from the planet.

MOST (satellite)

MOSTMicrovariability and Oscillations of STars telescopeMicrovariability and Oscillations of STars
Observations by the orbiting Microvariability and Oscillations of STars telescope initially limited the planet's albedo (or reflectivity) below 0.3, making it a surprisingly dark object.

Geoffrey Marcy

MarcyGeoff MarcyGeoffrey W. Marcy
Other achievements include discovering the first multiple planet system around a star similar to our own (Upsilon Andromedae), the first transiting planet around another star, simultaneously with David Charbonneau and Timothy Brown (HD209458b), the first extrasolar planet orbiting beyond 5 AU (55 Cancri d), and the first Neptune-sized planets (Gliese 436b and 55 Cancri e).

Travis Barman

On April 10, 2007, Travis Barman of the Lowell Observatory announced evidence that the atmosphere of HD 209458 b contained water vapor.
While studying a combination of the previously published Hubble Space Telescope measurements and new theoretical models, Barman found strong evidence for water absorption in the atmosphere of HD 209458 b.

Lowell Observatory

FlagstaffFlagstaff ObservatoryLowell
On April 10, 2007, Travis Barman of the Lowell Observatory announced evidence that the atmosphere of HD 209458 b contained water vapor.

51 Pegasi b

Dimidium51 Peg ban exoplanet
This is between the predicted temperatures of HD 189733 b and HD 209458 b (1180–1392 K), before they were measured.

Osiris

OsirianAserOsirian Mysteries
HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.

Solar analog

solar twinSun-likeSun-like stars
HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.

Light-year

light yearlight yearsMly
HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.

Solar System

outer Solar Systeminner Solar Systemouter planets
HD 209458 b, also given the nickname Osiris, is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 159 light-years from the Solar System.

Astronomical unit

AUastronomical unitsAUs
The radius of the planet's orbit is 7 million kilometres, about 0.047 astronomical units, or one eighth the radius of Mercury's orbit.

Mercury (planet)

MercuryMercurioplanet Mercury
The radius of the planet's orbit is 7 million kilometres, about 0.047 astronomical units, or one eighth the radius of Mercury's orbit.

Gas giant

gas giantsgiant planetJovian
The high mass and volume of HD 209458 b indicate that it is a gas giant.

Theory

theoreticaltheoriestheorist
Using a combination of previously published Hubble Space Telescope measurements and new theoretical models, Barman found strong evidence for water absorption in the planet's atmosphere.