NGC 185 (also known as Caldwell 18 ) is a dwarf spheroidal galaxy located 2.08 million light-years from Earth, appearing in the constellation Cassiopeia . It is a member of the Local Group , and is a satellite of the Andromeda Galaxy (M31). NGC 185 was discovered by William Herschel on November 30, 1787, and he cataloged it "H II.707". John Herschel observed the object again in 1833 when he cataloged it as "h 35", and then in 1864 when he cataloged it as "GC 90" within his General Catalogue of Nebulae and Clusters . NGC 185 was first photographed between 1898 and 1900 by James Edward Keeler with the Crossley Reflector of Lick Observatory . Unlike most dwarf elliptical galaxies, NGC 185 contains young stellar clusters , and star formation proceeded at a low rate until the recent past. NGC 185 has an active galactic nucleus (AGN) and is usually classified as a type 2 Seyfert galaxy , though its status as a Seyfert is questioned. It is possibly the closest Seyfert galaxy to Earth, and is the only known Seyfert in the Local Group.
10-622: (Redirected from C-18 ) C18 may refer to: Science and technology [ edit ] Caldwell 18 ( NGC 185 ), a dwarf spheroidal galaxy of the Local Group in the constellation Cassiopeia Carbon-18 (C-18 or C), an isotope of carbon C 18 , the molecular formula of cyclo(18)carbon C18, an octadecyl-type hydrocarbon with 18 carbon atoms, such as Fatty acids such as Stearic acid , C 18 H 36 O 2 Oleic acid C 18 H 34 O 2 C18 bonded silica stationary phase column,
20-409: A type of reversed-phase chromatography column IEC 60320 C18 , a power connector Colorectal cancer (ICD-10 code) ISO/IEC 9899:2018 standard for the programming language C, informally named C18 Transportation and military [ edit ] HMS C18 , a submarine Sauber C18 , a Formula One racing car Chrysler Royal C18, a 1938 car The C-18, a military cargo version of
30-802: Is uncertain whether these are companion galaxies of the Andromeda Galaxy Walter Baade Wilhelm Heinrich Walter Baade (March 24, 1893 – June 25, 1960) was a German astronomer who worked in the United States from 1931 to 1959. Baade was born the son of a teacher in North Rhine-Westphalia , Germany . He finished school in 1912. He then studied maths, physics and astronomy at the universities of Münster and Göttingen . He received his PhD in 1919. Baade worked at Hamburg Observatory at Bergedorf from 1919 to 1931. In 1920 he discovered 944 Hidalgo ,
40-487: The star formation history of NGC 185 and found that the majority of star formation in NGC 185 happened at early times. In the last ~1 Gyr, stars have formed only near the center of this galaxy. Walter Baade discovered young blue objects within this galaxy in 1951, but these have turned out to be star clusters and not individual stars. A supernova remnant near the center was also discovered by Martínez-Delgado et al. * It
50-599: The 1952 meeting of the International Astronomical Union in Rome. Together with Fritz Zwicky , he identified supernovae as a new category of astronomical objects. Zwicky and he also proposed the existence of neutron stars , and suggested supernovae might create them. Beginning in 1952, he and Rudolph Minkowski identified the optical counterparts of various radio sources, including Cygnus A . He discovered 10 asteroids , including 944 Hidalgo , which has
60-487: The Boeing C-137 Stratoliner Other uses [ edit ] French Defence (Encyclopaedia of Chess Openings code) Combat 18 , a British neo-Nazi organization 18th century (1701–1800 AD) Android 18 , character from Dragon Ball Franchise Bill C-18, Canada's Online News Act [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with
70-567: The center of the Andromeda Galaxy for the first time. These observations led him to define distinct " populations " for stars ( Population I and Population II ). The same observations led him to discover that there are two types of Cepheid variable stars. Using this discovery he recalculated the size of the known universe, doubling the previous calculation made by Edwin Hubble in 1929. He announced this finding to considerable astonishment at
80-564: The first of a class of minor planets now called Centaurs which cross the orbits of giant planets. From 1931 to 1958, he worked at Mount Wilson Observatory In 1937, the University of Hamburg wanted Baade as successor of Richard Schorr for the Hamburg Observatory, but he refused. At Mount Wilson Observatory, during World War II , he took advantage of wartime blackout conditions (which reduced light pollution ), to resolve stars in
90-407: The graininess of their appearance. The distance measured to NGC 185 using this technique is 2.08 ± 0.15 Mly (640 ± 50 kpc ). However, NGC 185 is close enough that the tip of the red giant branch (TRGB) method may be used to estimate its distance. The estimated distance to NGC 185 using this technique is 2.02 ± 0.2 Mly (620 ± 60 kpc). Martínez-Delgado, Aparicio, & Gallart (1999) looked into
100-675: The same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=C18&oldid=1169212899 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages NGC 185 At least two techniques have been used to measure distances to NGC 185. The surface brightness fluctuations distance measurement technique estimates distances to galaxies based on
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