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The Triangulum Galaxy (also known as Spiral Galaxy M33, Galaxy M33, Messier Object 33, Messier 33, M33, or NGC 598) is a spiral galaxy of type Sc located in the Triangulum constellation. Triangulum is small relative to its larger neighbors such as the Milky Way and the Andromeda Galaxy, but is about average compared to most spiral galaxies in the universe. Triangulum is a member of the Local Group of galaxiesThis article is about a celestial body. For alternate meanings see galaxy (disambiguation). Spiral Galaxy ESO 269-57 is about 150 million light-years away and 200,000 light-years across. Stars are almost always found in collections called galaxies togethe and may be a gravitationally bound companion of Andromeda. LGS 3 , one of the small Local Group member galaxies, is itself possibly a satelliteFor other uses, please see Satellite (disambiguation A satellite is an object that orbits another object (known as its primary . The term is often used to describe an artificial satellite (as opposed to natural satellites, or moons). Because all objects e of Triangulum.

1 General information

Triangulum was probably discovered by Giovanni Batista HodiernaGiovanni Batista Hodierna ( 1597- 1660) was an astronomer at the court of the Duke of Montechiaro. He compiled a catalog of some 40 entries, including at least 19 real and verifyable nebulous objects. External links Hodierna, Giovanni Batista Hodierna, Gi before 1654Events April 5 Signing of the Treaty of Westminster, ending the First Anglo-Dutch War. June 3 Louis XIV of France crowned at Rheims June 6 Charles X succedes his cousin Christina to the Swedish throne. After her abdication on June 5, Christina now the for, who may have grouped it together with open clusterStar clusters are physically bound systems of stars. In order of low compactness to high compactness (and in some sense also age) they range from stellar associations to open clusters to globular clusters. Globular Cluster M92 in the Hercules constellatio NGC 752. It was independently discovered by Charles MessierCharles Messier ( 1730- 06-26 1817- 04-12) was a French astronomer who in 1774 published a catalogue of 45 deep sky objects such as nebulae and star clusters. The purpose of the catalogue was to help comet hunters (like himself) and other naked-eye observ in 1764, who catalogued it as M33 on August 25. Triangulum was also catalogued independently by William Herschel on September 11, 1784, who assigned it the number H V.17. Triangulum was among the first "spiral Nebulae" identified as such by Lord Rosse.

Herschel also cataloged Triangulum's brightest and largest H II region (diffuse emission nebula containing ionized hydrogen) as H III.150 separately from the galaxy itself, which eventually obtained NGC number 604. As seen from Earth NGC 604 is located northeast of the galaxy's central core, and is one of the largest H II regions known with a diameter of nearly 1500 light years and a spectrum similar to the Orion Nebula.

This galaxy can be seen with the naked eye under exceptionally good conditions, and for most people is the most distant object visible.