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- Q15831 subject Q1031119.
- Q15831 subject Q18575720.
- Q15831 subject Q6465294.
- Q15831 subject Q7009278.
- Q15831 subject Q8335676.
- Q15831 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. Although the ansae are most prominent in the Saturn Nebula, they are also visible in other planetary nebulae, including NGC 3242, NGC 6543 and NGC 2371-2.The distance of the Saturn Nebula is not known precisely. 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 solar luminosities and a visual magnitude of 11.5. This strong ultraviolet irradiation from the central star creates 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 towards the Earth.The nebula is 1 degree west of the star Nu Aquarii. The central portion measures 25″ × 17″, while the outer shell extends to 41″ × 35″. The object is on many "best of" observing lists.".
- Q15831 thumbnail NGC_7009_Hubble.jpg?width=300.
- Q15831 wikiPageExternalLink ap971230.html.
- Q15831 wikiPageWikiLink Q1031119.
- Q15831 wikiPageWikiLink Q10576.
- Q15831 wikiPageWikiLink Q12129.
- Q15831 wikiPageWikiLink Q124313.
- Q15831 wikiPageWikiLink Q1334102.
- Q15831 wikiPageWikiLink Q13632.
- Q15831 wikiPageWikiLink Q14277.
- Q15831 wikiPageWikiLink Q15829.
- Q15831 wikiPageWikiLink Q16744.
- Q15831 wikiPageWikiLink Q18575720.
- Q15831 wikiPageWikiLink Q193.
- Q15831 wikiPageWikiLink Q21.
- Q15831 wikiPageWikiLink Q223282.
- Q15831 wikiPageWikiLink Q2513.
- Q15831 wikiPageWikiLink Q285778.
- Q15831 wikiPageWikiLink Q310121.
- Q15831 wikiPageWikiLink Q4213.
- Q15831 wikiPageWikiLink Q510168.
- Q15831 wikiPageWikiLink Q524496.
- Q15831 wikiPageWikiLink Q531.
- Q15831 wikiPageWikiLink Q5871.
- Q15831 wikiPageWikiLink Q6465294.
- Q15831 wikiPageWikiLink Q7009278.
- Q15831 wikiPageWikiLink Q8335676.
- Q15831 wikiPageWikiLink Q843877.
- Q15831 wikiPageWikiLink Q857461.
- Q15831 wikiPageWikiLink Q8928.
- Q15831 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.".
- Q15831 label "Saturn Nebula".
- Q15831 depiction NGC_7009_Hubble.jpg.