In this section on constellations, you will learn: Who…Antlia is one of the 88 constellations within the celestial sphere. Greek astronomer Ptolemy was the first one to catalogue this constellation. This is indicative of an exceptionally high rate of star formation coinciding with its classification as a starburst galaxy. The nebula was discovered by the German-born British astronomer William Herschel on February 7, 1785.The cluster has an apparent magnitude of 10.2. However, in some respects, Messier 83 is quite similar to our own galaxy. The astronomer named Ptolemy listed Hydra when he made a list of 48 constellations. The story behind the name: The constellation Hydra is most closely associated with the legend of the second labor of Heracles, which may echo a Babylonian legend in which the hero Gilgamesh killed a seven-headed monster. The nebula is usually called the Ghost of Jupiter or Jupiter’s Ghost, and sometimes also the Eye Nebula. 27 Hydrae has an apparent magnitude of 4.82.Messier 68 is a globular cluster in Hydra, also discovered by Charles Messier, in 1780. Hydra, (Latin: “Water Snake”) constellation in the southern sky that stretches from 8 to 15 hours right ascension and from about 5° north to 30° south in declination. It is the biggest constellation. Naval Observatory), Yervant Terzian (Cornell University), Mario Perinotto (University of Florence), Patrizio Patriarchi (Arcetri Observatory) and NASA, ESAZeta Hydrae is an evolved giant in the luminosity class between a giant and bright giant. It has an apparent magnitude of 13.4 and is approximately 150 million light years distant from the solar system.Six supernovae have been observed in the galaxy in the last century: SN 1923A, SN 1945B, SN 1950B, SN 1957D, SN 1968L and SN 1983N.NGC 3621 is a pure-disc galaxy: it does not have a central bulge.NGC 3242 is a planetary nebula in Hydra. Hydra is a constellation that has parts in the northern sky and parts in the southern sky. It has the stellar classification of G8 III, which makes the star a yellow giant.The star has a radius 21 times solar and is 151 times more luminous than the Sun. Although neutron stars cannot be seen in any amateur telescope, they are at the center of many supernova remnant nebulae, which can be seen.WISE 0855?0714 is the 4th closest star to Earth at 7.26 light years.These are the brightest and easiest-to-find double, triple, and quadruple star systems in the constellation hydra. Hydra’s head is located south of the Cancer constellation and the tail lies between Libra and Centaurus. Hydra constellation is usually associated with the second of Heracles’ labours in Greek mythology. It is a red giant with an apparent magnitude that slowly changes from 3.5 to 10.9 over a period of 389 days. Both the Milky Way and Messier 83 possess a bar across their galactic nucleus, the dense spherical conglomeration of stars seen at the centre of the galaxies. It is approximately 129 light years distant from Earth.Messier 48 is an open star cluster in Hydra, believed to be about 300 million years old. Antlia is one of the 29 constellations that represents an object. It has a visual magnitude of 3.25 and is 101 light years distant from Earth. The stars have an orbital period of 15 years and are separated by 0.2 arc seconds. Hydra is a constellation that has parts in the northern sky and parts in the southern sky. It is one of the few carbon stars that can be seen without binoculars. It has an apparent magnitude of 2.993 and is 133.8 light years distant from Earth. Hydra represents the Lernaean Hydra, a reptilian monster so vile that even its breath and blood were highly poisonous.
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