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- HD 209458b is a gas giant exoplanet that orbits an F-type star1. It is 1.38 times the size of Jupiter but has only 0.69 times its mass2. The planet takes 3.5 days to complete one orbit of its star and is 0.04707 AU from its star1. A group of investigators led by Jeremy Richardson of NASA's Goddard Space Flight Center spectrally measured HD 209458 b's atmosphere in the range of 7.5 to 13.2 micrometres3.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.HD 209458 b is a gas giant exoplanet that orbits an F-type star. Its mass is 0.73 Jupiters, it takes 3.5 days to complete one orbit of its star, and is 0.04707 AU from its star.exoplanets.nasa.gov/exoplanet-catalog/6902/hd-20…HD 209458b is 1.38 times the size of Jupiter but has only 0.69 times its mass.www.britannica.com/topic/HD-209458bA group of investigators led by Jeremy Richardson of NASA's Goddard Space Flight Center spectrally measured HD 209458 b's atmosphere in the range of 7.5 to 13.2 micrometres.en.wikipedia.org/wiki/HD_209458_b
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See all on WikipediaHD 209458 b - Wikipedia
HD 209458 b is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 157 light-years (48 parsecs) from the Solar System. The radius of the planet's orbit is 0.047 AU (7.0 million km; 4.4 million mi), or one-eighth the radius of Mercury's orbit (0.39 AU (36 million mi; 58 million … See more
Transits
Spectroscopic studies first revealed the presence of a planet around HD 209458 on November 5, 1999. Astronomers had made careful photometric measurements of several stars … See more
In 2014, a magnetic field around HD 209458 b was inferred from the way hydrogen was evaporating from the planet. It is the first (indirect) detection of a magnetic field on an exoplanet. The magnetic field is estimated to be about one tenth as strong as … See more
• Charbonneau, D. (2003). "HD 209458 and the Power of the Dark Side". In Deming, Drake; Seager, Sara (eds.). Scientific Frontiers in … See more
In August 2008, the measurement of HD 209458 b's Rossiter–McLaughlin effect and hence spin–orbit angle is −4.4 ± 1.4°.
The study in 2012, updated the spin-orbit angle to −5±7°. See more• 51 Pegasi b
• YZ Ceti another extra solar planet with evidence of magnetic fields
• HAT-P-11b another extra solar planet with evidence of magnetic fields
• Tau Boötis b another extra solar planet with evidence of … See more• "European astronomers observe first evaporating planet". Hubble Space Telescope. ESA/NASA. 2003-03-12. Archived from the original on 2008-07-07. Retrieved 2008-06-28.
• Hubble Finds Three Surprisingly Dry Exoplanets See moreWikipedia text under CC-BY-SA license HD 209458 b - NASA Science
WEBHD 209458 b is a gas giant exoplanet that orbits an F-type star. Its mass is 0.73 Jupiters, it takes 3.5 days to complete one orbit of its star, and is 0.04707 AU from its star. Its …
HD 209458b | Distance, Characteristics, & Facts | Britannica
WEBHD 209458b is 1.38 times the size of Jupiter but has only 0.69 times its mass. It orbits surprisingly close to the star—about 9 stellar radii. John Donald Fernie. Science …
HD 209458b - NASA Science
WEBMar 12, 2003 · Astronomers using the Hubble Space Telescope have made the first direct detection of the atmosphere of a planet orbiting a star outside our solar system. The …
Atmosphere of an Extrasolar Planet Detected for the First Time
WEBSep 28, 2024 · HD 209458b is estimated to be 70 percent the mass of Jupiter, or 220 times more massive than Earth. Transit observations by Hubble and ground-based telescopes …
The atmosphere of HD 209458b seen with ESPRESSO
WEBWe observed two transits of the iconic gas giant HD 209458b between 380 and 780 nm, using the high-resolution ESPRESSO spectrograph. The derived planetary transmission …
HD 209458 | NASA Exoplanet Archive
WEBhd 209458 Effective temperature, radius and luminosity drawn from BF model in Table 1; Mass and surface density from BF-LC model in Table 1; Density from text. (del Burgo & …
CHEOPS geometric albedo of the hot Jupiter HD 209458 b ⋆
WEBMar 2, 2022 · HD 209458 b has been and remains one of the most frequently studied hot Jupiters in history since its discovery in 1999 (Henry et al. 2000; Charbonneau et al. …
The signature of hot hydrogen in the atmosphere of …
WEBFeb 1, 2007 · Far-UV HST transit observations of HD 209458b revealed a hydrogen obscuring disk which is ∼ 15% of the size of the stellar disk 2, much larger than the ∼ 1.5% planetary disk seen in the optical.
The orbital motion, absolute mass and high-altitude …
WEBJun 24, 2010 · Here, high-dispersion ground-based spectroscopy of a transit of the extrasolar planet HD 209458b is reported. This allowed the radial component of the planet's orbital velocity to be calculated...
Oxygen and carbon discovered in exoplanet atmosphere 'blow-off'
WEBFeb 2, 2004 · Scientists using the NASA / ESA Hubble Space Telescope have observed the famous extrasolar planet HD 209458b passing in front of its parent star, and found …
Open Exoplanet Catalogue - HD 209458 b
WEBThis list shows all planetary and stellar components in the system. It gives a quick overview of the hierarchical architecture. HD 209458, stellar object. HD 209458 b, planet, semi …
WEBThe transit of HD 209458 b fixes the orbital inclination (which removes the sin i ambiguity in mass), it gives the planet radius, provides the average planet density, and confirms that …
HD 209458 - Wikipedia
WEBHD 209458 is radiating 1.8 times the luminosity of the Sun from its photosphere at an effective temperature of 6,071 K. [7] Because the planet transits the star, the star is …
THE 4.5 μm FULL-ORBIT PHASE CURVE OF THE HOT …
WEBJul 2, 2014 · HD 209458b's observed phase curve, which represent the first 4.5 μm measurements of its nightside emission, indicates that HD 209458b has a day-to-night …
1 The first transiting planet – HD 209458 b - OpenLearn
WEBHD 209458 b orbits the star HD 209458, which is just a catalogue number. Like 51 Pegasi b, HD 209458 b is very unlike any planet in our Solar System. Its orbital period is just …
Happy Anniversary, Osiris - NASA Science
WEBApr 22, 2024 · An artist's conception of HD 209458 b, an exoplanet whose atmosphere is being torn off at more than 35,000 km/hour by the radiation of its close-by parent star. …
Broadband transmission spectroscopy of HD 209458b with …
WEBThe detection of a giant planet orbiting the bright solar-type star HD 209458 represents a major cornerstone in exoplanet research. First detected using the radial velocity method, …
A NEW APPROACH TO ANALYZING HST SPATIAL SCANS: …
WEBDec 1, 2016 · In the case of HD 209458 b (scan length of 170 pixels), for a column at 1.2 μm, the wavelength difference between the lower and the upper edge of the spatially …
HD 209458 Star Facts - Universe Guide
WEBHD 209458 is a blue to white star in the constellation of Pegasus. It is too faint to be seen in the northern hemisphere night sky without a telescope. HD 209458 distance from Earth …
Scientists Estimate the Magnetic Moment of Exoplanet HD 209458b
WEBNov 21, 2014 · Planet HD 209458b (Osiris) is a hot Jupiter, approximately one-third larger and lighter than Jupiter. It is a hot gaseous giant orbiting very close to the host star HD …
HD 209458 b - Infogalactic: the planetary knowledge core
WEBHD 209458 b (sometimes unofficially called Osiris) is an exoplanet that orbits the solar analog HD 209458 in the constellation Pegasus, some 150 light-years from the Solar …
Transmission Spectra of HD 209458b - IOPscience
WEBWe present the transmission spectra of the hot Jupiter HD 209458b taken with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope. Our analysis …
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