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Other astronomers, using side notes in Messier's texts, eventually filled out the list up to 110 objects. [9] The catalogue consists of a diverse range of astronomical objects, from star clusters and nebulae to galaxies. For example, Messier 1 is a supernova remnant, known as the Crab Nebula, and the great spiral Andromeda Galaxy is M31.
M — Catalog of Nebulae and Star Clusters (Messier object) M — Minkowski (planetary nebulae) Ma — J.H. Madler (double stars) Mac — Maclear (double stars) MACS — Massive Cluster Survey or Magellanic Catalogue of Stars; MACHO — MACHO Project lensing events (Massive Compact Halo Object)
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For example, the Document Object Model (DOM) is a collection of objects that represent a page in a web browser, used by script programs to examine and dynamically change the page. There is a Microsoft Excel object model [1] for controlling Microsoft Excel from another program, and the ASCOM Telescope Driver is an object model for controlling an ...
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Messier or Caldwell ID NGC number Common name Image Object type Distance Constellation Apparent magnitude – NGC 2420 Open Cluster – Gemini: 8.3 – NGC 2421 Open Cluster – Puppis: 8.3 M47 NGC 2422 Open Cluster: 1.6 Puppis: 4.4 – NGC 2423 Open Cluster – Puppis: 6.7 – NGC 2438 Planetary Nebula: 2.9 Puppis: 10 – NGC 2440 Planetary ...
NGC 6207 is a spiral galaxy located in the constellation Hercules.It is designated as SA(s)c in the galaxy morphological classification scheme and was discovered by William Herschel on 16 May 1787.