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Coma Star Cluster
The Coma Star Cluster (also known as Melotte 111 or Collinder 256) is a small but nearby open cluster located in the constellation Coma Berenices. The cluster contains about 40 brighter stars (between magnitudes 5 and 10) with a common proper motion. The brighter stars of the cluster make out a distinctive "V" shape as seen when Coma Berenices is rising. The cluster used to represent the tail of Leo. However, in around 240 BC, Ptolemy III renamed it for the Egyptian queen Berenice's legendary sacrifice of her hair. The ''Hipparcos'' satellite and infrared color-magnitude diagram fitting have been used to establish a distance to the cluster's center of approximately . The distance established via the independent analyses agree, thereby making the cluster an important rung on the cosmic distance ladder. The open cluster is roughly twice as distant as the Hyades and covers an area of more than 7.5 degrees on the sky. The cluster is approximately 450 million years old. See ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donald Pettit
Donald Roy Pettit (born April 20, 1955) is an American astronaut and chemical engineer. He is a veteran of two long-duration stays aboard the International Space Station, one Space Shuttle mission and a six-week expedition to find meteorites in Antarctica. As of 2022, at age 67, he is NASA's oldest active astronaut. Early life and education Pettit was raised in Silverton, Oregon, and is an Eagle Scout. He is married to Micki Pettit and has twin sons. Pettit earned a Bachelor of Science degree in chemical engineering from Oregon State University in 1978, followed by a Ph.D. from the University of Arizona in 1983. NASA career Pettit worked as a scientist at the Los Alamos National Laboratory until 1996 when he was selected as an astronaut candidate by NASA. He was a junior advisor to the Synthesis Committee of the Space Exploration Initiative on its May 1991 report "America at the Threshold", recommending plans for a human mission to Mars. Spaceflight experience Exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
31 Comae Berenices
31 Comae Berenices (31 Com) is a yellow giant star in the constellation Coma Berenices. Its apparent magnitude is about 4.9 and slightly variable. It is a rare FK Comae Berenices variable, a variable star that spins rapidly and has large starspots on its surface. It is currently in the Hertzsprung gap and its outer envelope has just begun convection. In 1989 it was given as a spectral standard for the class G0IIIp. 31 Com is the north galactic pole star, and occasionally goes by the informal name Polaris Galacticum Borealis, coined by Jim Kaler. In Chinese astronomy, 31 Comae Berenices is called 郎將, Pinyin: Lángjiāng, meaning ''Captain of the Bodyguards'', because this star is marking itself and stand alone in ''Captain of the Bodyguards'' asterism, Supreme Palace enclosure mansion (see : Chinese constellation Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" ( Chinese ''xīng gu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Nearby Stellar Associations And Moving Groups ...
This is a list of nearby stellar associations and moving groups. A stellar association is a very loose star cluster, looser than an open cluster. A moving group is the remnant of such a stellar association. Members of stellar associations and moving groups share similar kinematic properties, as well as similar ages and chemical composition. ''The list is sorted by the distance to the Solar System.'' See also *List of stellar streams *List of open clusters *List of nearest stars and brown dwarfs References {{Portal bar, Astronomy, Stars, Spaceflight, Outer space, Solar System Stellar associations A stellar association is a very loose star cluster, looser than both open clusters and globular clusters. Stellar associations will normally contain from 10 to 100 or more stars. The stars share a common origin, but have become gravitationally u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alpha Persei Cluster
The Alpha Persei Cluster, also known as Melotte 20 or Collinder 39, is an open cluster of stars in the northern constellation of Perseus. To the naked eye, the cluster consists of several blue-hued spectral type B stars. The most luminous member is the ~2nd magnitude white-yellow supergiant Mirfak, also known as Alpha Persei. Bright members also include Delta, Sigma, Psi, 29, 30, 34, and 48 Persei. The Hipparcos satellite and infrared color-magnitude diagram fitting have been used to establish a distance to the cluster of ~. The distance established via the independent analyses agree, thereby making the cluster an important rung on the cosmic distance ladder. As seen from the Earth, the extinction of the cluster due to interstellar dust is around 0.30. The cluster is centered to the northeast of Alpha Persei. It has a core radius of , a half-mass radius of , and a tidal radius of , with 517 members being identified within the latter. The cluster shows solid evidence of havin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
8 Comae Berenices
8 (eight) is the natural number following 7 and preceding 9. In mathematics 8 is: * a composite number, its proper divisors being , , and . It is twice 4 or four times 2. * a power of two, being 2 (two cubed), and is the first number of the form , being an integer greater than 1. * the first number which is neither prime nor semiprime. * the base of the octal number system, which is mostly used with computers. In octal, one digit represents three bits. In modern computers, a byte is a grouping of eight bits, also called an octet. * a Fibonacci number, being plus . The next Fibonacci number is . 8 is the only positive Fibonacci number, aside from 1, that is a perfect cube. * the only nonzero perfect power that is one less than another perfect power, by Mihăilescu's Theorem. * the order of the smallest non-abelian group all of whose subgroups are normal. * the dimension of the octonions and is the highest possible dimension of a normed division algebra. * the first numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
18 Comae Berenices
Eighteen or 18 may refer to: * 18 (number), the natural number following 17 and preceding 19 * one of the years 18 BC, AD 18, 1918, 2018 Film, television and entertainment * ''18'' (film), a 1993 Taiwanese experimental film based on the short story ''God's Dice'' * ''Eighteen'' (film), a 2005 Canadian dramatic feature film * 18 (British Board of Film Classification), a film rating in the United Kingdom, also used in Ireland by the Irish Film Classification Office * 18 (''Dragon Ball''), a character in the ''Dragon Ball'' franchise * "Eighteen", a 2006 episode of the animated television series ''12 oz. Mouse'' Music Albums * ''18'' (Moby album), 2002 * ''18'' (Nana Kitade album), 2005 * '' 18...'', 2009 debut album by G.E.M. Songs * "18" (5 Seconds of Summer song), from their 2014 eponymous debut album * "18" (One Direction song), from their 2014 studio album ''Four'' * "18", by Anarbor from their 2013 studio album '' Burnout'' * "I'm Eighteen", by Alice Cooper commonly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
21 Comae Berenices
21 Comae Berenices is a variable star in the northern constellation of Coma Berenices. It has the variable star designation UU Comae Berenices, while 21 Comae Berenices is the Flamsteed designation. About According to R. H. Allen, English orientalist Thomas Hyde attributed the ancient title Kissīn to this star, a name that comes from a climbing plant – either bindweed or dog rose. This star has a white hue and is just visible to the naked eye with an apparent visual magnitude that fluctuates around 5.47. Based upon parallax measurements, it is located at a distance of approximately 270 light years away from the Sun. It is a single star but is a confirmed physical member of the Melotte 111 open cluster. History This object has been studied extensively since 1953, producing some occasionally contradictory results such as hints of pulsational behavior or a binary companion. It is a weakly magnetic chemically peculiar star of type CP2, or Ap star, that is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
17 Comae Berenices
17 Comae Berenices (17 Com) is a multiple star system in the northern constellation of Coma Berenices. The brighter component, 17 Com A, is a naked eye star with an apparent visual magnitude of 5.2. It has a faint companion of magnitude 6.6, 17 Com B, positioned at an angular separation of along a position angle of 251°, as of 2018. They are located at a distance of approximately 240 light years from the Sun based on parallax measurements. The double nature of this system was documented by F. G. W. Struve in 1836. The pair share a common proper motion through space and thus may be associated. Component B is itself a binary star system, although only the brighter component is visible in the spectrum. The Washington Double Star Catalogue lists the companion as component C, with a magnitude of 13.7 and a separation of . 17 Com has been recognized as members of the Coma Star Cluster, but this is disputed. The star 17 Com A was classified as chemically peculiar by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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