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TOI-2180 B
TOI-2180 b is a giant exoplanet orbiting the G-type star, G-type star TOI-2180, also known as HD 238894. It was discovered with the help of the Transiting Exoplanet Survey Satellite and is currently the exoplanet with the longest orbital period TESS was able to uncover (as of September 2022). TOI-2180 b orbits its host star every 260.16 days. Discovery TOI-2180 b was first identified as an exoplanet candidate due to a single Astronomical transit, transit with TESS at 12./13. December 2019 by a group of Citizen science, citizen scientists called the Visual Survey Group, which includes Thomas Lee Jacobs, a former U. S. Naval Officer, U.S. naval officer. The group was using the light curve processing tool lcTools. In May 2020 the Planet Hunters#Planet Hunters: TESS, Planet Hunters: TESS collaboration announced this object as a Community TESS Object of Interest (CTOI) and it was soon promoted into a regular TOI. The The TESS-Keck Survey, TESS-Keck Survey collaboration performed ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The TESS-Keck Survey
The TESS-Keck Survey or TKS is an exoplanet search project that uses the W. M. Keck Observatory, Keck I and the Automated Planet Finder (APF) to conduct List of telescope types, ground-based follow-up of planet candidates discovered by the Transiting Exoplanet Survey Satellite. The TKS aims to measure the mass for about 100 exoplanets and has been awarded some of the largest time allocations in the histories of Keck I and APF. The program has four main science themes: # the bulk compositions of small planets # dynamical temperatures and system architectures # a larger, more refined sample for future atmospheric studies # planets orbiting Stellar evolution, evolved stars List of discoveries Follow-up works by TKS studied the already discovered planets TOI-1726 c and WASP-107b. References [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semi-major And Semi-minor Axes
In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the two most widely separated points of the perimeter. The semi-major axis (major semiaxis) is the longest semidiameter or one half of the major axis, and thus runs from the centre, through a focus, and to the perimeter. The semi-minor axis (minor semiaxis) of an ellipse or hyperbola is a line segment that is at right angles with the semi-major axis and has one end at the center of the conic section. For the special case of a circle, the lengths of the semi-axes are both equal to the radius of the circle. The length of the semi-major axis of an ellipse is related to the semi-minor axis's length through the eccentricity and the semi-latus rectum \ell, as follows: The semi-major axis of a hyperbola is, depending on the convention, plus or minus one half of the distance between the two branches. Thus it is the distance from the cente ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heavy Metals
upright=1.2, Crystals of lead.html" ;"title="osmium, a heavy metal nearly twice as dense as lead">osmium, a heavy metal nearly twice as dense as lead Heavy metals are generally defined as metals with relatively high density, densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids are included, vary depending on the author and context. In metallurgy, for example, a heavy metal may be defined on the basis of density, whereas in physics the distinguishing criterion might be atomic number, while a chemist would likely be more concerned with chemical property, chemical behaviour. More specific definitions have been published, but none of these have been widely accepted. The definitions surveyed in this article encompass up to 96 out of the 118 known chemical elements; only mercury, lead and bismuth meet all of them. Despite this lack of agreement, the term (plural or singular) is widely used in science. A density of more than 5 g/cm3 is som ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metallicity
In astronomy, metallicity is the abundance of elements present in an object that are heavier than hydrogen and helium. Most of the normal physical matter in the Universe is either hydrogen or helium, and astronomers use the word ''"metals"'' as a convenient short term for ''"all elements except hydrogen and helium"''. This word-use is distinct from the conventional chemical or physical definition of a metal as an electrically conducting solid. Stars and nebulae with relatively high abundances of heavier elements are called "metal-rich" in astrophysical terms, even though many of those elements are nonmetals in chemistry. The presence of heavier elements hails from stellar nucleosynthesis, where the majority of elements heavier than hydrogen and helium in the Universe (''metals'', hereafter) are formed in the cores of stars as they evolve. Over time, stellar winds and supernovae deposit the metals into the surrounding environment, enriching the interstellar medium and provid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apparent Magnitude
Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's light caused by interstellar dust along the line of sight to the observer. The word ''magnitude'' in astronomy, unless stated otherwise, usually refers to a celestial object's apparent magnitude. The magnitude scale dates back to the ancient Roman astronomer Claudius Ptolemy, whose star catalog listed stars from 1st magnitude (brightest) to 6th magnitude (dimmest). The modern scale was mathematically defined in a way to closely match this historical system. The scale is reverse logarithmic: the brighter an object is, the lower its magnitude number. A difference of 1.0 in magnitude corresponds to a brightness ratio of \sqrt /math>, or about 2.512. For example, a star of magnitude 2.0 is 2.512 times as bright as a star of magnitude 3.0 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kepler-1704b
Kepler-1704b is a super-Jupiter on a highly eccentric orbit around the star Kepler-1704. It has a mass of 4.51 . The planet's distance from its star varies from 0.16 to 3.9 AU. It is a failed hot Jupiter, been scattered from its birth orbit to orbit with periastron just above tidal circularization distance. Characteristics Kepler-1704b is much more massive than Jupiter, at 4.51 M''J.'' The high planetary mass makes Kepler-1704b a super-Jupiter. Kepler-1704b goes on a highly eccentric 2.7 year-long (988.88 days) orbit around its star as well as transiting. The extreme eccentricity yields a temperature difference of up to 700 K. Star The star, Kepler-1704, is a G2, 5745-kelvin star from Earth and the sun. It has a mass of , a radius of , and a luminosity of . The high radius for the star's mass hints that Kepler-1704 is not a main-sequence star. See also * Gas giant * List of planet types *Kepler-419b * HD 80606 b *HR 5183 b HR 5183 b is an exoplanet located 102.7 light ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WD 1856+534
WD may refer to: Arts and entertainment * ''The Walking Dead'' (TV series) * ''White Dwarf'' (magazine) Businesses and organizations Government agencies * Royal Canadian Air Force Women's Division * War Department (United Kingdom) Other businesses and organizations * DAS Air Cargo (IATA code WD) * Wardair (defunct IATA code WD) * WD-40 Company, manufacturer of household and multi-use products, well known for its signature brand, WD-40. * Western Digital, a computer storage manufacturer * Western Economic Diversification Canada, a Canadian government agency * Wikidata, a Wikimedia Foundation collaborative online project * Wilts & Dorset, a southern England bus operator * Winn-Dixie, an American supermarket chain Places * WD postcode area, England, UK * County Waterford, Ireland Science and technology * WD-40, a penetrating oil spray * Band 3, a protein * Web Dynpro, a web application for developing business applications * Whipple's disease, a rare, syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kepler-167 E
Kepler-167 is a K-type main-sequence star located about away from the Solar System in the constellation of Cygnus. The star has about 78% the mass and 75% the radius of the Sun, and a temperature of . It hosts a system of four known exoplanets. There is also a companion red dwarf star at a separation of about , with an estimated orbital period of over 15,000 years. Planetary system Kepler-167 is orbited by four known transiting exoplanets, discovered using the Kepler space telescope. The inner three planets are all super-Earths of unknown composition orbiting closer to their star than Mercury is to the Sun. The outermost planet, Kepler-167e, is a Jupiter analog, with , , and an equilibrium temperature of . It is the first transiting Jupiter analog discovered. The inner two planets were confirmed in 2014, as part of a study validating hundreds of Kepler planets, and the outer two planets were confirmed in 2016. Observations of Kepler-167e using the Spitzer Space T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperature Jupiters
Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have relied on various reference points and thermometric substances for definition. The most common scales are the Celsius scale with the unit symbol °C (formerly called ''centigrade''), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes. The kelvin is one of the seven base units in the International System of Units (SI). Absolute zero, i.e., zero kelvin or −273.15 °C, is the lowest point in the thermodynamic temperature scale. Experimentally, it can be approached very closely but not actually reached, as recognized in the third law of thermodynamics. It would be impossible to extract energy as heat from a body at that temperature. Temperature is important in all fields of natura ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
