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Encyclopedia > HD 189733
HD 189733 A
Observation data
Epoch J2000.0
Constellation Vulpecula
Right ascension 20h 00m 43.7133s
Declination +22° 42′ 39.070″
Apparent magnitude (V) 7.67
Distance 62.9 ly
(19.3 pc)
Spectral type K1-K2 (Hip. lists G5)
Other designations
GJ 4130, HIP 98505

HD 189733 (HD 189733 A) is a yellow dwarf star about 63 light-years away in the constellation Vulpecula. Given that this star has the same visual magnitude as HD 209458, it promises much for the study of close transiting extrasolar planets. The star can be found with binoculars 0.3 degrees east of the Dumbbell Nebula (M27).
In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... It has been suggested that this article or section be merged into Julian epoch. ... This article or section does not cite its references or sources. ... Vulpecula, being Latin for Fox, is a faint northern constellation located in the middle of the Summer Triangle, an asterism consisting of the bright stars Deneb, Vega and Altair. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... Distance is a numerical description of how far apart things lie. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... In astronomy, many stars are referred to simply by catalogue numbers. ... Large solar flare recorded by SOHO EIT304 instrument in the ultraviolet. ... The Pleiades, an open cluster of stars in the constellation of Taurus. ... A light-year, symbol ly, is the distance light travels in one year: exactly 9. ... This article or section does not cite its references or sources. ... Vulpecula, being Latin for Fox, is a faint northern constellation located in the middle of the Summer Triangle, an asterism consisting of the bright stars Deneb, Vega and Altair. ... HD 209458 is an 8th magnitude star in the constellation Pegasus. ... Messier Object 27, the Dumbbell Nebula The Dumbbell Nebula (also known as Messier Object 27, M27, or NGC 6853) is a planetary nebula in the Vulpecula constellation, at a distance of about 1250 light years. ...

Contents


Planet

HD 189733 Ab

HD 189733 Ab
Orbital elements
Semi-major axis (a) 0.0313 ± 0.0004 AU
Eccentricity (e) 0.00
Orbital period (P) 2.219 d
Inclination (i) 85.3° ± 0.1°
Longitude of
periastron		 (ω) °
Time of periastron (τ) JD
Physical characteristics
Mass 1.15 ± 0.04 MJ
Radius 1.26 ± 0.03 RJ
Density 0.75 ± 0.08 kg/m³
Temperature 1117 ± 42 K
Discovery
Discovery date 2005
Detection method(s)
Discoverer(s) Mayor et al.

HD 189733 Ab is an extrasolar jovian planet discovered in 2005. 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. 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. ... Water, Rabbit, and Deer: three of the 20 day symbols in the Aztec calendar, from the Aztec Sun Stone. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... 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 number of days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar . ... Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... Adjective Jovian Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... In classical geometry, a radius of a circle or sphere is any line segment from its center to its boundary. ... Adjective Jovian Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... The cubic meter (symbol m³) is the SI derived unit of volume. ... In thermodynamics, temperature is the physical property of a system that underlies the common notions of hot and cold —something that is hotter has the greater temperature. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... 2M1207 (blue) and its planet 2M1207b, as viewed by the Very Large Telescope array. ... Michel Mayor (born 12 January 1942) is a professor in the Department of Astronomy at the University of Geneva. ... From top: Neptune, Uranus, Saturn, and Jupiter. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... 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). ...


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. 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... Image of a small dog taken 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. ... The French 1999 eclipse An eclipse (Greek verb: ekleipô, to vanish, though it may derive from the prefix ex-, away from, and Greek leipein, to miss[verification needed]) is an astronomical event that occurs when one celestial object moves into the shadow of another. ...

"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 [µJy]) 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."


The Spitzer Space Telescope Facility launches from Cape Canaveral Air Force Station in Florida on Monday, Aug. ... For Acoustic uses in spectrographs of sound waves, see below. ... A micrometre (American spelling: micrometer), symbol µm, is an SI unit of length. ... The eight planets and three dwarf planets of our solar system, alongside the Sun. ... 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. ... 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. ... Adjective Neptunian Atmospheric characteristics Surface pressure ≫100 MPa Hydrogen - H2 80% ±3. ... Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ...


HD 189733 B

HD 189733 B
Observation data
Epoch J2000.0
Constellation Vulpecula
Right ascension 20h 00m 43.7133s
Declination +22° 42′ 39.070″
Apparent magnitude (V) unknown
Distance 62.9 ly
(19.3 pc)
Spectral type M?
Other designations
none

HD 189733 B is a stellar companion of HD 189733 A. At about 216 AU from its primary, this M-dwarf orbits star A every 3,200 years.
In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... It has been suggested that this article or section be merged into Julian epoch. ... This article or section does not cite its references or sources. ... Vulpecula, being Latin for Fox, is a faint northern constellation located in the middle of the Summer Triangle, an asterism consisting of the bright stars Deneb, Vega and Altair. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... Distance is a numerical description of how far apart things lie. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... In astronomy, many stars are referred to simply by catalogue numbers. ... Artists impression of a binary star system consisting of a black hole, with an accretion disc around it, and a main sequence star. ... The astronomical unit (AU or au or a. ... Red Dwarf is a British science fiction sitcom that ran for eight series, from 1988 to 1999. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...


References

Astronomy and Astrophysics (often referred to as A&A) is a European Journal, publishing papers on theoretical, observational and instrumental astronomy and astrophysics. ...

External links


  Results from FactBites:
 
CBA Belgium Website (373 words)
The discovery of the very hot exoplanet HD 189733b was announced by the team of F. Bouchy of the Observatoire de Haute Provence (France) on October 5th, 2005.
HD 189733b was reported to be a transiting hot Jupiter, with a period of 2.219d, and with a photometric depth of about 3%.
Considering that HD 189733, a type K-star, has the same visual magnitude as the well known exoplanet host star HD 209458, of which I succeeded to observe an exoplanet transit in September 2003, I decided to start photometric observations of HD 189733 at the first possible transit opportunity.
Exoplanet Encyclopedia (808 words)
HD 102195 b: pierwsza planeta odkryta (metod± predko¶ci radialnych) przez Exoplanet Tracker (Jian Ge et al).
HD 33564 b: un planeta rodeado por un disco (Galland et al.)
HD 33564 b: planeta wokó³ gwiazdy otoczonej dyskiem protoplanetarnym (Galland et al)
  More results at FactBites »

 

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