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LHS 2520
LHS 2520, also known as GJ 3707, is a red dwarf star in the constellation Corvus. With an apparent magnitude of 12.12, it is too faint to be seen with the unaided eye. A cool star of spectral type M3.5V, it has a surface temperature of 3024 K. The star was too faint to have had its parallax measured by the ''Hipparcos'' satellite. Measurement by ''Gaia'' gives its parallax as milliarcseconds, yielding a distance of . In popular culture In ''Action Comics'' #14 (January 2013), which was published 7 November 2012, Neil Degrasse Tyson appears in the story, in which he determines that Superman's home planet, Krypton, orbited LHS 2520. Tyson assisted DC Comics in selecting a real-life star that would be an appropriate parent star to Krypton, and picked the star in Corvus, and which is the mascot of Superman's high school, the Smallville Crows. The star also appears as LP 734-32 in the 2014 game, Elite Dangerous. References {{Stars of Corvus Corvus (constellation) M-type ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name means "crow" in Latin. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it depicts a raven, a bird associated with stories about the god Apollo, perched on the back of Hydra (constellation), Hydra the water snake. The four brightest stars, Gamma Corvi, Gamma, Delta Corvi, Delta, Epsilon Corvi, Epsilon, and Beta Corvi, form a distinctive quadrilateral or cross-shape in the night sky. With an apparent magnitude of 2.59, Gamma Corvi—also known as Gienah—is the brightest star in the constellation. It is an aging blue giant around four times as solar mass, massive as the Sun. The young star Eta Corvi has been found to have two debris disks. Three star systems have exoplanets, and a fourth planetary system is unconfirmed. TV Corvi is a dwarf nova—a white dwarf and brown dwarf in very binary star, close orbit. History and mythology In the Babylonian star catalogues dating fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luyten Half-Second Catalogue
A star catalogue is an astronomical catalogue that lists stars. In astronomy, many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the years, and this article covers only some of the more frequently quoted ones. Star catalogues were compiled by many different ancient people, including the Babylonians, Ancient Greece, Greeks, History of China, Chinese, History of Iran, Persians, and Arabs. They were sometimes accompanied by a star chart for illustration. Most modern catalogues are available in electronic format and can be freely downloaded from space agencies' Data Centre, data centres. The largest is being compiled from the spacecraft ''Gaia (spacecraft), Gaia'' and thus far has over a billion stars. Completeness and accuracy are described by the faintest limiting magnitude V (largest number) and the accuracy of the Star position, positions. Historical catalogues Ancient ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gliese-Jahreiss Catalogue
The ''Gliese Catalogue of Nearby Stars'' (, English ) is a star catalogue listing stars located within 25 parsecs (82 ly) of the Sun. First edition and supplements In 1957, German astronomer Wilhelm Gliese published his first star catalogue of 915 known stars within of Earth, listing their known properties and ordered geographically by right ascension. Stars in the first catalogue are designated by coding ''GL NNN'', the N representing the consecutive integer number based on this order. Gliese published an update as the ''Catalogue of Nearby Stars'' in 1969, all known stars to , which catalogued 1,529 stars, encoded as ''Gl NNN.NA'' (prefix Gl and the entries of twelve years before gained a .0 affix; the more than 500 additional stars were recorded using interspersed 0.1, 0.2 etc. numbering). This list therefore numbered from 1.0 to 915.0 as no stars were entered after 915.0. and retained a strict right ascension order. A Supplement published in 1970 by Richard van ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Red Dwarf
A red dwarf is the smallest kind of star on the main sequence. Red dwarfs are by far the most common type of fusing star in the Milky Way, at least in the neighborhood of the Sun. However, due to their low luminosity, individual red dwarfs are not easily observed. Not one star that fits the stricter definitions of a red dwarf is visible to the naked eye. Proxima Centauri, the star nearest to the Sun, is a red dwarf, as are fifty of the sixty nearest stars. According to some estimates, red dwarfs make up three-quarters of the fusing stars in the Milky Way. The coolest red dwarfs near the Sun have a surface temperature of about and the smallest have radii about 9% that of the Sun, with masses about 7.5% that of the Sun. These red dwarfs have spectral types of L0 to L2. There is some overlap with the properties of brown dwarfs, since the most massive brown dwarfs at lower metallicity can be as hot as and have late M spectral types. Definitions and usage of the term "red d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hipparcos
''Hipparcos'' was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions and distances of celestial objects on the sky. This permitted the first high-precision measurements of the intrinsic brightnesses, proper motions, and parallaxes of stars, enabling better calculations of their distance and tangential velocity. When combined with radial velocity measurements from spectroscopy, astrophysicists were able to finally measure all six quantities needed to determine the motion of stars. The resulting ''Hipparcos Catalogue'', a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision ''Tycho Catalogue'' of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. ''Hipparcos'' follow-up mission, '' Gaia'', was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gaia (spacecraft)
''Gaia'' was a space observatory of the European Space Agency (ESA) that was launched in 2013 and operated until March 2025. The spacecraft was designed for astrometry: measuring the positions, distances and motions of stars with unprecedented precision, and the positions of exoplanets by measuring attributes about the stars they orbit such as their apparent magnitude and color. , the mission data processing continues, aiming to construct the largest and most precise 3D space catalog ever made, totalling approximately 1 billion astronomical objects, mainly stars, but also planets, comets, asteroids and quasars, among others. To study the precise position and motion of its target objects, the spacecraft monitored each of them about 70 times over the five years of the nominal mission (2014–2019), and about as many during its extension. Due to its detectors not degrading as fast as initially expected, the mission was given an extension. As of March 2023, the spacecraft had en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Action Comics
''Action Comics'' is an American comic book/Comic anthology, magazine series that introduced Superman, one of the first major superhero characters. The publisher was originally known as Detective Comics Inc., which later merged into National Comics Publications (later National Periodical Publications), before taking on its current name of DC Comics. Its original incarnation ran from 1938 to 2011 and stands as one of the longest-running comic books with consecutively numbered issues. The second volume of ''Action Comics'' beginning with issue #1 ran from 2011 to 2016. ''Action Comics'' returned to its original numbering beginning with issue #957 (Aug. 2016). Publication history The Golden Age Jerry Siegel and Joe Shuster saw their creation, Superman (also known as Kal-El, originally Kal-L), launched in Action Comics 1, ''Action Comics'' #1 on April 18, 1938 (cover dated June), an event which began the Golden Age of Comic Books. Siegel and Shuster had tried for years to find a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neil Degrasse Tyson
Neil deGrasse Tyson ( or ; born October 5, 1958) is an American astrophysics, astrophysicist, author, and science communication, science communicator. Tyson studied at Harvard University, the University of Texas at Austin, and Columbia University. From 1991 to 1994, he was a Postdoctoral researcher, postdoctoral research associate at Princeton University. In 1994, he joined the Hayden Planetarium as a staff scientist and the Princeton faculty as a visiting research scientist and lecturer. In 1996, he became director of the planetarium and oversaw its $210 million reconstruction project, which was completed in 2000. Since 1996, he has been the director of the Hayden Planetarium at the Rose Center for Earth and Space in New York City. The center is part of the American Museum of Natural History, where Tyson founded the Department of Astrophysics in 1997 and has been a research associate in the department since 2003. From 1995 to 2005, Tyson wrote monthly essays in the "Univers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superman
Superman is a superhero created by writer Jerry Siegel and artist Joe Shuster, which first appeared in the comic book ''Action Comics'' Action Comics 1, #1, published in the United States on April 18, 1938.The copyright date of ''Action Comics'' Action Comics 1, #1 was registered as April 18, 1938. See Superman has been regularly published in American comic books since 1938, and has been adapted to other media including radio serials, novels, films, television shows, theater, and video games. Superman was born Kal-El, on the fictional planet Krypton (comics), Krypton. As a baby, his parents Jor-El and Lara (character), Lara sent him to Earth in a small spaceship shortly before Krypton was destroyed in a natural cataclysm. His ship landed in the American countryside near the fictional town of Smallville (comics), Smallville, Kansas. He was found and adopted by farmers Jonathan and Martha Kent, who named him Clark Kent. Clark began developing Superpower (ability), superhuman abi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Krypton (comics)
Krypton is a fictional planet appearing in American comic books published by DC Comics, most commonly appearing or mentioned in stories starring the superhero Superman as the world from where he came. The planet was created by Jerry Siegel and Joe Shuster, and was named after the chemical element krypton. The planet was first mentioned in ''Action Comics'' #1 (June 1938) and made its first appearance in ''Superman'' #1 (1939). Krypton is also the homeworld of Supergirl, Krypto the Superdog, Beppo the Super-Monkey, Power Girl (in her case, an alternate-universe version designated "Krypton-Two"), and the supervillain General Zod. It has been consistently described as having been destroyed shortly after Superman's escape from the planet, although the exact details of its destruction vary by time period and writers. Kryptonians were the dominant species on Krypton. Krypton also makes an appearance in several television series such as '' Adventures of Superman'', '' Lois & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
