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- NGC_2818 abstract "NGC 2818 is a planetary nebula located in the southern constellation Pyxis (The Compass). This spectacular nebula consists largely of glowing gases from the star's outer layers ejected during the final stages of its life when it had run out of the fuel necessary to sustain its core fusion processes. The remnants of its core will remain as a white dwarf.It is often cited as a member of the open cluster NGC 2818A framing it, however, radial velocity differences between the planetary nebula and open cluster suggest a chance alignment. The case is an example of a superimposed pair, similar to NGC 2438 and M46.Partly because of their small total mass, open clusters have relatively poor gravitational cohesion. Consequently, open clusters tend to disperse after a relatively short time, typically some 10 million years, because of external gravitational influences amid other factors. Under exceptional conditions, open clusters can remain intact for up to 100 million years. Theoretical models predict that planetary nebulae can form from main-sequence stars of between 8 and 1 solar masses, which puts their age at 40 million years and older. Although there are a few hundred known open clusters within that age range, a variety of reasons limit the chances of finding a member of an open cluster in a planetary nebula phase. One such reason is that the planetary nebula phase for more massive stars belonging to younger clusters is on the order of thousands of years - a blink of the eye in cosmic terms. Only one association has been established between open clusters and nearby nebulae, the extremely distant nebula PHR 1315-6555".
- NGC_2818 thumbnail NGC_2818_by_the_Hubble_Space_Telescope.jpg?width=300.
- NGC_2818 wikiPageID "21160349".
- NGC_2818 wikiPageLength "4076".
- NGC_2818 wikiPageOutDegree "21".
- NGC_2818 wikiPageRevisionID "656987392".
- NGC_2818 wikiPageWikiLink Category:Astronomical_objects_discovered_in_1826.
- NGC_2818 wikiPageWikiLink Category:ESO_objects.
- NGC_2818 wikiPageWikiLink Category:NGC_objects.
- NGC_2818 wikiPageWikiLink Category:Planetary_nebulae.
- NGC_2818 wikiPageWikiLink Category:Pyxis_(constellation).
- NGC_2818 wikiPageWikiLink Constellation.
- NGC_2818 wikiPageWikiLink Epoch_(astronomy).
- NGC_2818 wikiPageWikiLink Hubble_Space_Telescope.
- NGC_2818 wikiPageWikiLink J2000.0.
- NGC_2818 wikiPageWikiLink Main-sequence.
- NGC_2818 wikiPageWikiLink Main_sequence.
- NGC_2818 wikiPageWikiLink Messier_46.
- NGC_2818 wikiPageWikiLink NGC_2438.
- NGC_2818 wikiPageWikiLink NGC_2818A.
- NGC_2818 wikiPageWikiLink Open_cluster.
- NGC_2818 wikiPageWikiLink PHR_1315-6555.
- NGC_2818 wikiPageWikiLink Planetary_nebula.
- NGC_2818 wikiPageWikiLink Pyxis.
- NGC_2818 wikiPageWikiLink Radial_velocity.
- NGC_2818 wikiPageWikiLink White_dwarf.
- NGC_2818 wikiPageWikiLink File:NGC_2818_by_the_Hubble_Space_Telescope.jpg.
- NGC_2818 wikiPageWikiLinkText "2818".
- NGC_2818 wikiPageWikiLinkText "NGC 2818".
- NGC_2818 caption "Hubble Space Telescope image of NGC 2818".
- NGC_2818 constellation Pyxis.
- NGC_2818 distLy "10400.0".
- NGC_2818 epoch Epoch_(astronomy).
- NGC_2818 epoch J2000.0.
- NGC_2818 hasPhotoCollection NGC_2818.
- NGC_2818 name "NGC 2818".
- NGC_2818 names "NGC 2818, PLN 261+8.1 ESO 372-PN13".
- NGC_2818 radiusLy "3.25".
- NGC_2818 sizeV "2'".
- NGC_2818 wikiPageUsesTemplate Template:Infobox_Planetary_nebula.
- NGC_2818 wikiPageUsesTemplate Template:Reflist.
- NGC_2818 subject Category:Astronomical_objects_discovered_in_1826.
- NGC_2818 subject Category:ESO_objects.
- NGC_2818 subject Category:NGC_objects.
- NGC_2818 subject Category:Planetary_nebulae.
- NGC_2818 subject Category:Pyxis_(constellation).
- NGC_2818 hypernym Nebula.
- NGC_2818 type Star.
- NGC_2818 type Catalogue.
- NGC_2818 type Object.
- NGC_2818 comment "NGC 2818 is a planetary nebula located in the southern constellation Pyxis (The Compass). This spectacular nebula consists largely of glowing gases from the star's outer layers ejected during the final stages of its life when it had run out of the fuel necessary to sustain its core fusion processes.".
- NGC_2818 label "NGC 2818".
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs m.05c539g.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs NGC_2818.
- NGC_2818 sameAs Q939462.
- NGC_2818 sameAs Q939462.
- NGC_2818 wasDerivedFrom NGC_2818?oldid=656987392.
- NGC_2818 depiction NGC_2818_by_the_Hubble_Space_Telescope.jpg.
- NGC_2818 isPrimaryTopicOf NGC_2818.