Even though the name Dorado is notLatin but Spanish, astronomers give it the Latingenitive formDoradus when naming its stars; it is treated (like the adjacent asterismArgo Navis) as a feminine proper name of Greek origin ending in -ō (likeIo orCallisto orArgo), which have a genitive ending-ūs.
InJohannes Kepler's edition ofTycho Brahe's star list in theRudolphine Tables of 1627; this was the first time that it was given the alternative name Xiphias, theswordfish. The name Dorado ultimately became dominant and was adopted by the IAU.
Dorado represents adolphinfish; it has also been called the goldfish because Dorado are gold-colored.[3]
Lacaille gave 15 starsBayer designations Alpha through Pi in 1756, but omitted Iota, Omicron, and Xi, and labelled two stars as Eta and Pi. Mu Doradus was removed from star catalogues because of its dimness.[4]
Alpha Doradus is a blue-white star of magnitude 3.3, 176 light-years from Earth. It is the brightest star in Dorado.Beta Doradus is a notably brightCepheid variable star. It is a yellow-tinged supergiant star that has a minimum magnitude of 4.1 and a maximum magnitude of 3.5. One thousand and forty light-years from Earth, Beta Doradus has a period of 9 days and 20 hours.[2]
Supernova 1987A was the closest supernova to occur since the invention of the telescope.SNR 0509-67.5 is the remnant of an unusually energetic Type Ia supernova from about 400 years ago.
Dorado is also the location of the SouthEcliptic pole, which lies near the fish's head. The pole was called "Polus Doradinalis" byPhilipp von Zesen, aka Caesius.[7]
Because Dorado contains part of theLarge Magellanic Cloud, it is rich in deep sky objects. The Large Magellanic Cloud, 25,000 light-years in diameter, is asatellite galaxy of the Milky Way Galaxy, located at a distance of 179,000 light-years. It has been deformed by its gravitational interactions with the larger Milky Way. In 1987, it became host toSN 1987A, the first supernova of 1987 and the closest since 1604.[8] This 25,000-light-year-wide galaxy contains over 10,000 million stars.[2] All coordinates given are for EpochJ2000.0.
NGC 1566 (RA 04h 20m 00sDec -56° 56.3′) is a face-on spiral galaxy. It gives its name to theNGC 1566 Group of galaxies.
NGC 1755 (RA 04h 55m 13s Dec -68° 12.2′) is a globular cluster.
NGC 1763 (RA 04h 56m 49s Dec -68° 24.5′) is a bright nebula associated with three type B stars.
NGC 1761 (RA 04h 56m 37s Dec -66° 28.4') is an open cluster.
NGC 1820 (RA 05h 04m 02s Dec -67° 15.9′) is an open cluster.
NGC 1850 (RA 05h 08m 44s Dec -68° 45.7′) is a globular cluster.
NGC 1854 (RA 05h 09m 19s Dec -68° 50.8′) is a globular cluster.
NGC 1869 (RA 05h 13m 56s Dec -67° 22.8′) is an open cluster.
NGC 1901 (RA 05h 18m 15s Dec -68° 26.2′) is an open cluster.
NGC 1910 (RA 05h 18m 43s Dec -69° 13.9′) is an open cluster.
NGC 1936 (RA 05h 22m 14s Dec -67° 58.7′) is a bright nebula and is one of four NGC objects in close proximity, the others beingNGC 1929,NGC 1934 andNGC 1935.
NGC 1978 (RA 05h 28m 36s Dec -66° 14.0′) is an open cluster.
NGC 2002 (RA 05h 30m 17s Dec -66° 53.1′) is an open cluster.
NGC 2014 (RA 05h 44m 12.7s Dec −67° 42′ 57″) is a red emission nebula.
NGC 2027 (RA 05h 35m 00s Dec -66° 55.0′) is an open cluster.
NGC 2032 (RA 05h 35m 21s Dec -67° 34.1′; also known as "Seagull Nebula") is a nebula complex that contains four NGC designations:NGC 2029, NGC 2032,NGC 2035 andNGC 2040.
NGC 2074 (RA 05h 39m 03.0s Dec −69° 29′ 54″) is an emission nebula.
NGC 2078 (RA 05h 39m 54s Dec −69° 44′ 54″) is an emission nebula.
NGC 2080, also called the "Ghost Head Nebula", is an emission nebula that is 50 light-years wide in the Large Magellanic Cloud. It is named for the two distinct white patches that it possesses, which are regions of recentstar formation. The western portion is colored green fromdoubly ionized oxygen, the southern portion is red fromhydrogen alpha emissions, and the center region is colored yellow from both oxygen and hydrogen emissions. The western white patch, A1, has one massive, recently formed star inside. The eastern patch, A2, has several stars hidden in its dust.[8]
Tarantula Nebula is in the Large Magellanic Cloud, named for its spiderlike shape. It is also designated 30 Doradus, as it is visible to the naked eye as a slightly out-of-focus star. Larger than any nebula in the Milky Way at 1,000 light-years in diameter, it is also brighter, because it is illuminated by the open star clusterNGC 2070, which has at its center the star clusterR136. The illuminating stars aresupergiants.[2]
NGC 2164 (RA 05h 58m 53s Dec -68° 30.9′) is a globular cluster.
N44 is asuperbubble in the Large Magellanic Cloud that is 1,000 light-years wide. Its overall structure is shaped by the 40 hot stars towards its center. Within the superbubble of N44 is a smaller bubble catalogued as N44F. It is approximately 35 light-years in diameter and is shaped by an incredibly hot star at its center, which has astellar wind speed of 7 million kilometers per hour. N44F also features dust columns with probablestar formation hidden inside.[8]
^Wagman, Morton (2003).Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg,VA: The McDonald & Woodward Publishing Company. pp. 305–07.ISBN978-0-939923-78-6.
![NGC 1706 is a spiral galaxy, about 230 million light-years away.[12]](/image.pl?url=http%3a%2f%2fen.wikipedia.org%2f%2fupload.wikimedia.org%2fwikipedia%2fcommons%2fthumb%2f2%2f2f%2fNGC1706_-_HST_-_Potw1943a.tif%2flossy-page1-120px-NGC1706_-_HST_-_Potw1943a.tif.jpg&f=jpg&w=240)
