2MASS

•  Bayer designation

  A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars. Most of the brighter stars were assigned their first systematic names by the German astronomer Johann Bayer in 1603, in his star atlas Uranometria (named after Urania, the Greek Muse of Astronomy, along with Uranus, the Greek god of the sky and heavens).

  

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•  Flamsteed designation

  Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. Each star is assigned a number and the Latin genitive of the constellation it lies in (see List of constellations for a list of constellations and the genitive forms of their names). Flamsteed designation contained 2554 stars.

  

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•  Messier object

  The Messier objects are a set of astronomical objects first listed by French astronomer Charles Messier for 1774 (published in 1771). The original motivation of the catalogue was that Messier was a comet hunter, and was frustrated by objects which resembled but were not comets. He therefore compiled a list of these objects, in collaboration with his assistant Pierre Méchain. The first edition covered 45 objects numbered M1 to M45.

  

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•  Star catalogue

  A star catalogue, or star catalog, 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 peoples, including the Babylonians, Greeks, Chinese, Persians and Arabs.

  

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•  New General Catalogue

  The New General Catalogue (NGC) is a well-known catalogue of deep sky objects in astronomy. It contains 7,840 objects, known as the NGC objects. The NGC is one of the largest comprehensive catalogues, as it includes all types of deep space objects and is not confined to, for example, galaxies. The catalogue was compiled in the 1880s by J. L. E. Dreyer using observations mostly from William Herschel and his son John, for total of 7,840 objects.

  

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•  Index Catalogue

  The Index Catalogue (IC) —also known as the Index Catalogue of Nebulae, the Index Catalogue of Nebulae and Clusters of Stars, IC I, or IC II— is a catalogue of galaxies, nebulae and star clusters that serves as a supplement to the New General Catalogue. It was first published in 1895, and has been expanded to list 5,387 objects, known as the IC objects. The catalogue was compiled by J. L. E.

  

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•  List of Messier objects

  The Messier objects are a set of astronomical objects catalogued by the French astronomer Charles Messier in his "Catalogue des Nébuleuses et des Amas d'Étoiles" ("Catalogue of Nebulae and Star Clusters"), originally published in 1771, with the last addition (based on Messier's observations) made in 1966. Because Messier was interested in finding only comets, he created a list of non-comet objects that frustrated his hunt for them.

  

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•  Catalogue of Galaxies and Clusters of Galaxies

  The Catalogue of Galaxies and of Clusters of Galaxies (CGCG) was compiled by Fritz Zwicky in 1961–68, and contains 9134 galaxy clusters.

  

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•  Digitized Sky Survey

  The Digitized Sky Survey (DSS) is a digital version of several photographic atlases of the night sky, and an ongoing project to produce more digital versions of photographic astronomical datasets.

  

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•  Revised New General Catalogue

  The Revised New General Catalogue (RNGC) and companion Revised Index Catalogue (RIC) is a revision to the original New General Catalogue and Index Catalogues made by J. L. E. Dreyer. Some of the brightnesses of objects measured by Dreyer were not accurate or the description of the object was not accurate. Therefore they were revised. Most planetarium computer programs use the RNGC and the RIC as a source for their Deep sky object dataset. It was compiled by Jack W. Sulentic and W.G.

  

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• Astronomical catalogues by likeorhate
• Astronomical surveys by likeorhate
• Photometric systems by likeorhate

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•  List of U.S. state songs

  Forty-eight states of the United States have one or more state songs, selected by each state legislature, and/or state governor, as a symbol (or emblem) of the state. New Jersey does not have an official state song, while Virginia's state song, "Carry Me Back to Old Virginny" (adopted 1940), is now considered the "emeritus" state song and is scheduled to be replaced, having been rescinded by the Virginia General Assembly.

  

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•  331 BC

  Year 331 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Potitus and Marcellus (or, less frequently, year 423 Ab urbe condita). The denomination 331 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

  

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•  Dolby Digital

  Dolby Digital is the marketing name for a series of data/audio compression technologies developed by Dolby Laboratories.

  

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•  Treaty of Campo Formio

  The Treaty of Campo Formio or Peace of Campo Formio was signed on 17 October 1797 (26 Vendémiaire, Year VI of the French Republic) by Napoleon Bonaparte and Count Ludwig von Cobenzl as representatives of France and Austria. It marked the collapse of the First Coalition, the victorious conclusion to Napoleon's campaigns in Italy and the end of the first phase of the French Revolutionary Wars.

  

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•  Health libraries

  

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