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• Saturn_Nebula abstract "The Saturn Nebula or NGC 7009 is a planetary nebula in the constellation Aquarius. It appears as a greenish-yellowish hue in a small amateur telescope. It was discovered by William Herschel on September 7, 1782, using a telescope of his own design in the garden at his home in Datchet, England, and was one of his earliest discoveries in his sky survey. The nebula was originally a low-mass star that ejected its layers into space, forming the nebula. The central star is now a bright white dwarf star of apparent magnitude 11.5. The Saturn Nebula gets its name from its superficial resemblance to the planet Saturn with its rings nearly edge-on to the observer. It was so named by Lord Rosse in the 1840s, when telescopes had improved to the point that its Saturn-like shape could be discerned. William Henry Smyth said that the Saturn Nebula is one of Struve's nine "Rare Celestial Objects."The Saturn Nebula is a complex planetary nebula and contains many morphological and kinematic sub-systems in three dimensions. It includes a halo, jet-like streams, multiple shells, ansae ("handles"), and small-scale filaments and knots. The ansae are expanding non-radially from the central star.The distance of the Saturn Nebula is not known precisely because no reference stars have been detected in its neighborhood that could be used to accurately gauge it. Therefore any distance given is somewhat suspect. Sabbadin et al. 2004 estimates the distance to be 5,200 light-years (1.6 kpc). In 1963 O'Dell estimated it to be 3,900 light-years (1.2 kpc), which gives an approximate diameter of 0.5 light years for the object as a whole.The central star, a very hot bluish dwarf with a temperature of 55,000 K, from which the nebula is believed to originate, has an absolute magnitude of +1.5, which equates to a luminosity of about 20 Suns and a visual magnitude of 11.5. This strong ultraviolet irradiation from the central star is believed to create the characteristic fluorescent green tint of the nebula via the radiation of doubly ionized oxygen. The object overall has a visual magnitude of 8 and a radial velocity of 28 miles per second in approach.The nebula can be spotted 1 degree west of the star Nu Aquarii. The central portion measures 25″ 17″, while the outer shell extends to 41″ × 35″. It is a beautiful object with a high surface brightness.The object is on many "best of" observing lists, including: SAC 110 best NGC object list, RASC's Finest N.G.C. Objects Objects, and The Caldwell Catalog (#55).".
• Saturn_Nebula thumbnail NGC_7009_Hubble.jpg?width=300.
• Saturn_Nebula wikiPageExternalLink ap971230.html.
• Saturn_Nebula wikiPageExternalLink caldwell.html.
• Saturn_Nebula wikiPageExternalLink rasc-dsc.html.
• Saturn_Nebula wikiPageExternalLink sac110bn.html.
• Saturn_Nebula wikiPageID "933736".
• Saturn_Nebula wikiPageRevisionID "600607263".
• Saturn_Nebula absmagV "2.5".
• Saturn_Nebula appmagV "8".
• Saturn_Nebula caption "NGC 7009 by Hubble Space Telescope".
• Saturn_Nebula constellation Aquarius_(constellation).
• Saturn_Nebula distLy "2000".
• Saturn_Nebula epoch "J2000.0".
• Saturn_Nebula hasPhotoCollection Saturn_Nebula.
• Saturn_Nebula name "Saturn Nebula".
• Saturn_Nebula names "NGC 7009, Caldwell 55".
• Saturn_Nebula notes "-".
• Saturn_Nebula radiusLy "0.2".
• Saturn_Nebula sizeV "41".
• Saturn_Nebula type "IV+VI ?".
• Saturn_Nebula subject Category:Aquarius_(constellation).
• Saturn_Nebula subject Category:Caldwell_objects.
• Saturn_Nebula subject Category:NGC_objects.
• Saturn_Nebula subject Category:Planetary_nebulae.
• Saturn_Nebula type CaldwellObjects.
• Saturn_Nebula type Cloud111439690.
• Saturn_Nebula type NGCObjects.
• Saturn_Nebula type NaturalPhenomenon111408559.
• Saturn_Nebula type Nebula109366940.
• Saturn_Nebula type Object100002684.
• Saturn_Nebula type Phenomenon100034213.
• Saturn_Nebula type PhysicalEntity100001930.
• Saturn_Nebula type PhysicalPhenomenon111419404.
• Saturn_Nebula type PlanetaryNebula109394797.
• Saturn_Nebula type PlanetaryNebulae.
• Saturn_Nebula type Process100029677.
• Saturn_Nebula comment "The Saturn Nebula or NGC 7009 is a planetary nebula in the constellation Aquarius. It appears as a greenish-yellowish hue in a small amateur telescope. It was discovered by William Herschel on September 7, 1782, using a telescope of his own design in the garden at his home in Datchet, England, and was one of his earliest discoveries in his sky survey. The nebula was originally a low-mass star that ejected its layers into space, forming the nebula.".
• Saturn_Nebula label "NGC 7009".
• Saturn_Nebula label "NGC 7009".
• Saturn_Nebula label "NGC 7009".
• Saturn_Nebula label "NGC 7009".
• Saturn_Nebula label "Nebulosa Saturno".
• Saturn_Nebula label "Nebulosa Saturno".
• Saturn_Nebula label "Nebulosa Saturno".
• Saturn_Nebula label "Saturn Nebula".
• Saturn_Nebula label "Saturnnebel".
• Saturn_Nebula label "Saturnusnevel".
• Saturn_Nebula label "土星状星雲".
• Saturn_Nebula sameAs Saturnnebel.
• Saturn_Nebula sameAs Nebulosa_Saturno.
• Saturn_Nebula sameAs NGC_7009.
• Saturn_Nebula sameAs Nebulosa_Saturno.
• Saturn_Nebula sameAs 土星状星雲.
• Saturn_Nebula sameAs 토성_성운.
• Saturn_Nebula sameAs Saturnusnevel.
• Saturn_Nebula sameAs NGC_7009.
• Saturn_Nebula sameAs Nebulosa_Saturno.
• Saturn_Nebula sameAs m.03rb3j.
• Saturn_Nebula sameAs Q15831.
• Saturn_Nebula sameAs Q15831.
• Saturn_Nebula sameAs Saturn_Nebula.
• Saturn_Nebula wasDerivedFrom Saturn_Nebula?oldid=600607263.
• Saturn_Nebula depiction NGC_7009_Hubble.jpg.
• Saturn_Nebula isPrimaryTopicOf Saturn_Nebula.