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HD 189733 b is a gas giant planet that is in very close orbit around the yellow dwarf star HD 189733 A. This planet was discovered in 2005 when astronomers observed the planet transiting across the face of the star. The mass of the planet is an estimated 15% larger than Jupiter's, and it completes an orbit every 2.2 days. It is occasionally referred to as HD 189733 Ab to distinguish it from the red dwarf star HD 189733 B. Image File history File links Circle-question-red. ...
The semi-major axis of an ellipse In geometry, the term semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae. ...
The astronomical unit (AU or au or a. ...
In astrodynamics, under standard assumptions any orbit must be of conic section shape. ...
The orbital period is the time it takes a planet (or another object) to make one full orbit. ...
Look up day in Wiktionary, the free dictionary. ...
Inclination in general is the angle between a reference plane and another plane or axis of direction. ...
In mathematics (in particular geometry and trigonometry) and all natural sciences (including astronomy, geophysics, etc), the angular distance (or angular separation) between two point objects, as observed from a location different from either of these objects, is the size of the angle between the two directions originating from the observer...
A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ...
In astrodynamics, the longitude of the periapsis (symbolized ) of an orbiting body is the longitude (measured from the point of the vernal equinox) of periapsis (closest approach to the central body). ...
A diagram of Keplerian orbital elements. ...
A diagram of Keplerian orbital elements. ...
The Julian day or Julian day number (JDN) is the integer number of days that have elapsed since the initial epoch defined as noon Universal Time (UT) Monday, January 1, 4713 BC in the proleptic Julian calendar [1]. That noon-to-noon day is counted as Julian day 0. ...
Amplitude is a nonnegative scalar measure of a waves magnitude of oscillation, that is, magnitude of the maximum disturbance in the medium during one wave cycle. ...
Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector), defined by distance in metres divided by time in seconds. ...
This article or section is in need of attention from an expert on the subject. ...
Adjectives: Jovian Atmosphere Surface pressure: 20–200 kPa[4] (cloud layer) Composition: ~86% Molecular hydrogen ~13% Helium 0. ...
Remote Authentication Dial In User Service (RADIUS) is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. ...
Adjectives: Jovian Atmosphere Surface pressure: 20–200 kPa[4] (cloud layer) Composition: ~86% Molecular hydrogen ~13% Helium 0. ...
In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: Ï (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is...
The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. It was assigned to the United States in 1889 and is periodically recertified and traceable to the primary international standard, The Kilogram, held at the Bureau International des Poids et...
The cubic meter (symbol m³) is the SI derived unit of volume. ...
Gravity is a force of attraction that acts between bodies that have mass. ...
The term g force or gee force refers to the symbol g, the force of acceleration due to gravity at the earths surface. ...
This article includes a list of works cited or a list of external links, but its sources remain unclear because it lacks in-text citations. ...
The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. ...
Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ...
Any planet is an extremely faint light source compared to its parent star. ...
Michel Mayor (born 12 January 1942) is a professor in the Department of Astronomy at the University of Geneva. ...
This article does not cite any references or sources. ...
HD 189733 (HD 189733 A) is a yellow dwarf star about 63 light-years away in the constellation Vulpecula. ...
Adjectives: Jovian Atmosphere Surface pressure: 20–200 kPa[4] (cloud layer) Composition: ~86% Molecular hydrogen ~13% Helium 0. ...
This planet exhibits the largest photometric transit depth of any so far observed, of approximately 3%, and clearly exhibits the Rossiter-McLaughlin effect. It also has a very large semi-amplitude (K) of 205 m s⁻¹, as one would expect for such a close hot Jupiter. It was one of the first two planets to be directly spectroscopically observed, along with HD 209458 b. The Rossiter-McLaughlin effect is an spectroscopic phenomenon seen when either an eclipsing binarys secondary star or an extrasolar planet is seen to transit across the face of the primary or parent star. ...
Artists impression of roaster extrasolar planet HD 209458b (Osiris). ...
HD 209458 b is an extrasolar planet that orbits the Sun-like star HD 209458 in the constellation Pegasus, some 150 light-years from Earths solar system, with evidence of water vapor. ...
Observation 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 during its prominent secondary eclipse. For the Manfred Mann album, see 2006 (album). ...
Image of two girls in mid-infrared (thermal) light (false-color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ...
“Total eclipse†redirects here. ...
- "A 6-hour photometric sequence using Spitzer's infrared spectrograph in peak-up imaging mode at 16 [micrometers] shows the secondary eclipse depth to be 0.551 ± 0.030%, with accuracy limited by instrumental baseline uncertainties, but with 32-sigma precision (0.017%) on the detection. The 16-[micrometer] brightness temperature of this planet (1117 ± 42 K) is very similar to the Spitzer detections of TrES-1 and HD 209458 b, but the observed planetary flux (660 [micro-janskies]) is an order of magnitude greater. This large signal will allow a detailed characterization of this planet in the infrared. The photometry has sufficient signal-to-noise (~400 per point) to motivate a search for structure in the ingress/egress portions of the eclipse curve, caused by putative thermal structure on the disk of the planet. We show that by binning our 6-second sampling down to 6-minute resolution, we detect the modulation in the intensity derivative during ingress/egress due to the overall shape of the planet, but our sensitivity is not yet sufficient to distinguish between realistic models of the temperature distribution across the planet's disk. We point out the potential for extending Spitzer secondary eclipse detections down to the regime of transiting hot Neptunes, if such systems are discovered among nearby lower dwarf stars."
In 2007 the Spitzer space telescope was used to map the planet's temperature emissions. A temperature range of 973 ± 33 K to 1,212 ± 11 K was discovered, indicating that the star's heat is distributed fairly evenly through the planet's atmosphere. Interestingly, the region of peak temperature was offset 30 degrees east of the substellar point. Assuming the planet is tidally locked with its star, this suggests that powerful easterly winds moving at more than 9,600 kilometers per hour are responsible for redistributing the heat.[1]
The Spitzer Space Telescope (formerly the Space Infrared Telescope Facility [SIRTF]) is an infrared space observatory, the fourth and final of NASAs Great Observatories. ...
For Acoustic uses in spectrographs of sound waves, see below. ...
A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. ...
The eight planets and three dwarf planets of the Solar System. ...
The planet, dubbed TrES-1 was discovered by the Trans-Atlantic Exoplanet Survey (TrES). ...
HD 209458 b is an extrasolar planet that orbits the Sun-like star HD 209458 in the constellation Pegasus, some 150 light-years from Earths solar system, with evidence of water vapor. ...
In radio astronomy, the flux unit or jansky (symbol Jy) is a non-SI unit of electromagnetic flux equivalent to 10−26 watts per square metre per hertz. ...
Note: This article contains special characters. ...
Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ...
The Spitzer Space Telescope (formerly the Space Infrared Telescope Facility [SIRTF]) is an infrared space observatory, the fourth and final of NASAs Great Observatories. ...
Direct spectral observation On February 21, 2007, NASA released news that HD 189733 b and HD 209458 b had been directly spectroscopically observed, using the Spitzer Space Telescope.[2] The release came simultaneously with the public release of a new issue of Nature containing the first publication on the spectroscopic observation of the other star, HD 209458 b. The findings on HD 189733 b will appear in an upcoming issue of the Astrophysical Journal Letters. The spectroscopic observations of HD 189733 b were led by Carl Grillmair NASA's Spitzer Science Center. is the 52nd day of the year in the Gregorian calendar. ...
Year 2007 (MMVII) is now the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ...
The National Aeronautics and Space Administration (NASA) is an agency of the United States federal government, responsible for the nations public space program. ...
HD 209458 b is an extrasolar planet that orbits the Sun-like star HD 209458 in the constellation Pegasus, some 150 light-years from Earths solar system, with evidence of water vapor. ...
The Spitzer Space Telescope (formerly the Space Infrared Telescope Facility [SIRTF]) is an infrared space observatory, the fourth and final of NASAs Great Observatories. ...
Nature is one of the most prominent scientific journals, first published on 4 November 1869. ...
The California Institute of Technology (commonly referred to as Caltech)[1] is a private, coeducational university located in Pasadena, California, in the United States. ...
First map of an extra-solar planet  HD 189733 b just before being eclipsed by HD 189733A Courtesy:NASA/JPL-Caltech/Harvard-Smithsonian CfA On May 2007 NASA released a map of the surface temperature of HD 189733 b, performed by spectral observations through the Spitzer Space Telescope. This is the first map ever published of an extra-solar planet.[3]
First solid evidence of water vapor On July 11, 2007, a team lead by Giovanna Tinetti published the results of their observations using the Spitzer Space Telescope concluding there is solid evidence for significant amounts of water vapor in planet's atmosphere. [4] is the 192nd day of the year (193rd in leap years) in the Gregorian calendar. ...
Year 2007 (MMVII) is now the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ...
References A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ...
Astronomy and Astrophysics (often referred to as A&A) is a European Journal, publishing papers on theoretical, observational and instrumental astronomy and astrophysics. ...
See also HD 209458 b is an extrasolar planet that orbits the Sun-like star HD 209458 in the constellation Pegasus, some 150 light-years from Earths solar system, with evidence of water vapor. ...
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