M81 Group

	M81 Group The M81 Group is a galaxy group in the constellations Ursa Major and Camelopardalis that includes the galaxies Messier 81 and Messier 82, as well as several other galaxies with high apparent brightnesses. The approximate center of the group is located at a distance of 3.6 Mpc, making it one of the nearest groups to the Local Group. The group is estimated to have a total mass of (1.03 ± 0.17). The M81 Group, the Local Group, and other nearby groups all lie within the Virgo Supercluster (i.e. the Local Supercluster). Members The table below lists galaxies that have been identified as associated with the M81 Group by I. D. Karachentsev. Note that the object names used in the above table differ from the names used by Karachentsev. NGC, IC, UGC, and PGC numbers have been used in many cases to allow for easier referencing. Interactions within the group Messier 81, Messier 82, and NGC 3077 are all strongly interacting with each other. Observations of the 21-centimeter hy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Messier 81 HST Messier may refer to: People with the surname Ashley Messier (born 2002), Canadian ice hockey player Charles Messier (1730–1817), French astronomer Doug Messier (born 1936), Canadian ice hockey player and coach Éric Messier (born 1973), Canadian ice hockey player George Messier (1896–1933), French inventor Jean-Marie Messier (born 1956), French businessman Joby Messier (born 1970), Canadian ice hockey player Marc Messier (born 1947), Canadian actor and film-maker Mark Messier (born 1961), Canadian ice hockey player Mary Messier (born 1952), American politician Mitch Messier (born 1965), Canadian ice hockey player Paul Messier (ice hockey) (born 1958), Canadian ice hockey player Paul Arthur Messier (born 1962), American art conservator Other uses Messier Channel in western Patagonia, Chile Messier objects, set of 110 astronomical objects Messier (crater) on the Moon Messier (automobile), French car manufacturer 1925–1931 Messier-Dowty (and succeeding com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Second The second (symbol: s) is a unit of time derived from the division of the day first into 24 hours, then to 60 minutes, and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units (SI) is more precise: The second ..is defined by taking the fixed numerical value of the caesium frequency, Δ''ν''Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be when expressed in the unit Hz, which is equal to s−1. This current definition was adopted in 1967 when it became feasible to define the second based on fundamental properties of nature with caesium clocks. As the speed of Earth's rotation varies and is slowing ever so slightly, a leap second is added at irregular intervals to civil time to keep clocks in sync with Earth's rotation. The definition that is based on of a rotation of the earth is still used by the Universal Time 1 (UT1) system. Etymology "Minute" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Messier 81 Dwarf A Messier may refer to: People with the surname Ashley Messier (born 2002), Canadian ice hockey player Charles Messier (1730–1817), French astronomer * Doug Messier (born 1936), Canadian ice hockey player and coach Éric Messier (born 1973), Canadian ice hockey player George Messier (1896–1933), French inventor Jean-Marie Messier (born 1956), French businessman Joby Messier (born 1970), Canadian ice hockey player Marc Messier (born 1947), Canadian actor and film-maker Mark Messier (born 1961), Canadian ice hockey player Mary Messier (born 1952), American politician Mitch Messier (born 1965), Canadian ice hockey player Paul Messier (ice hockey) (born 1958), Canadian ice hockey player Paul Arthur Messier (born 1962), American art conservator Other uses Messier Channel in western Patagonia, Chile Messier objects, set of 110 astronomical objects Messier (crater) on the Moon Messier (automobile) Messier was a French automobile manufacturer, based at Montrouge, on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	KKH 57 KKH may refer to: * the Karakoram Highway in northern Pakistan * KK Women's and Children's Hospital, formerly known as "Kandang Kerbau Hospital", a hospital in Singapore * Kongiganak Airport (IATA code: KKH), an airport in Alaska See also * kkh, the ISO 639 code for the Khün language Khün, or Tai Khün (Tai Khün: , ; ), also known as Kengtung tai, Kengtung Shan, is the language of the Tai Khün people of Kengtung, Shan State, Myanmar (Burma). It is also spoken in Chiang Rai Province, Thailand, and Yunnan Province, Chin ... of Myanmar * KKh 060, a galaxy {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	IC 2574 IC 2574, also known as Coddington's Nebula, is a dwarf spiral galaxy discovered by American astronomer Edwin Foster Coddington in 1898. Located in Ursa Major Ursa Major, also known as the Great Bear, is a constellation in the Northern Sky, whose associated mythology likely dates back into prehistory. Its Latin name means "greater (or larger) bear", referring to and contrasting it with nearby Ursa M ..., a constellation in the northern sky, it is an outlying member of the M81 Group. It is believed that 90% of its mass is in the form of dark matter. IC 2574 does not show evidence of interaction with other galaxies. It is currently forming stars; a UV analysis showed clumps of star formation 85 to 500 light-years (26 to 150 pc) in size. References Dwarf spiral galaxies Intermediate spiral galaxies Magellanic spiral galaxies Ursa Major M81 Group 2574 05666 30819 Discoveries by Edwin Foster Coddington Astronomical objects discovered in 1898 {{Spiral-galaxy-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Holmberg IX Holmberg IX is a dwarf irregular galaxy and a satellite galaxy of M81, located in the constellation of Ursa Major. It is a Magellanic type galaxy, similar to the Small Magellanic Cloud, neighbour galaxy to the Milky Way Galaxy. The galaxy is named after Erik Holmberg who first described it, though it was originally discovered by Sidney van den Bergh in 1959. Based on the observed age distribution of stars it contains, 20% of its stellar mass formed within the last 200 Myr, making it the youngest nearby galaxy. It is also home to one of two yellow supergiant eclipsing binary A binary star or binary star system is a Star system, system of two stars that are gravity, gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved ... systems. References Further reading * * * * * * * External links * M81's satellite galaxy Holmberg IXGALEX Completes Four Star-Studded Years i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Holmberg II Holmberg II is an irregular dwarf galaxy in the constellation Ursa Major. Its apparent magnitude is 11,1m and it is 11 million light years away from Earth. The galaxy is dominated by huge glowing gas bubbles, which are regions of star formation. Holmberg II also hosts an ultraluminous X-ray source. One hypothesis suggests that is caused by an intermediate mass black hole that is pulling surrounding material. Holmberg II was discovered by Erik Bertil Holmberg. References External links * {{commons category-inline Ursa Major Dwarf galaxies 268 __NOTOC__ Year 268 (Roman numerals, CCLXVIII) was a leap year starting on Wednesday of the Julian calendar. At the time, it was known in Rome as the Year of the Consulship of Paternus and Egnatius (or, less frequently, the year 1021 ''Ab urbe ... 23324 04305 M81 Group ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Holmberg I Holmberg is a Swedish surname formed from the words ''holm(e)'' meaning islet and ''berg'' meaning mountain. It is a relatively common name, at least in Sweden, which has to do with the fact that many Swedish place names contain the suffixes ''-holm'', ''-holmen'' or ''-berg'', ''-berga'', ''-berget''. Notable people with the surname include: * Åke Holmberg (1907–1991), Swedish author and translator * Anne Holmberg (born 1938), American writer of historical romance novels * Arvid Holmberg (1886–1958), Swedish gymnast who competed in the 1908 Summer Olympics * Barbro Holmberg (born 1952), Swedish Social Democratic politician * Birgit Agda Holmberg (1921–2007), Swedish revue director, actress and singer * Bo Holmberg (1942–2010), Swedish politician, widower of former Swedish Minister for Foreign Affairs Anna Lindh (1957–2003) * Britta Holmberg (1921–2004), Swedish film actress * Carl Holmberg (1884–1909), Swedish gymnast who competed in the 1908 Summer Olympics * Carl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	HS 117 HS or Hs can stand for: Businesses and brands * HS Produkt, a Croatian firearms manufacturer * ''Helsingin Sanomat'', a newspaper in Finland * Hawker Siddeley, aircraft manufacturing group * Henschel & Son, in aircraft prefixes; e.g., Hs 117 * Head & Shoulders or H&S, a shampoo brand * Harris Scarfe and HS Home, a chain of Australian department stores Science and technology Chemistry * Hassium, symbol Hs, a chemical element * Humic substance * Bisulfide, HS−, a chemical compound derived from H2S * Mercapto radical, •, a radical molecule * Hun stuff (a World War I name for mustard gas) Medicine * hs, medical abbreviation for "hours of sleep" * '' h.s.'', medical abbreviation for the Latin phrase ''hora somni'' ("at bedtime") * Hereditary spherocytosis, a genetic disorder marked by hemolytic anemia * Hidradenitis suppurativa, a skin condition affecting apocrine sweat glands and hair follicles Other uses in science and technology * '.hs', the Haskell programming language's t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	FM1 (galaxy) FM1, FM 1 or FM-1 may refer to: * Bell YFM-1 Airacuda, an American heavy fighter aircraft * Farm to Market Road 1, a state-maintained highway in Texas * FM1 (radio station), a radio station in the Philippines * FM1, a dwarf galaxy in the M81 Group * Front Mission, a tactical role-playing game * General Motors FM-1 Wildcat, an American carrier-borne fighter aircraft * Melsheimer FM-1, an American glider * Socket FM1 Socket FM1 is a CPU socket for desktop computers used by AMD early A-series APUs ("Llano") processors and Llano-derived Athlon II processors. It was released in July 2011. Its direct successors are Socket FM2 (September 2012) and Socket FM2+ (Ja ... , an accelerated processing unit (APU) socket for AMD processors {{Letter-NumberCombDisambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]