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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 yet another example of a superposed pair, joining the famed case of 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. To date, no true association has been established between open clusters and planetary nebulae.".
- NGC_2818 thumbnail NGC_2818_by_the_Hubble_Space_Telescope.jpg?width=300.
- NGC_2818 wikiPageID "21160349".
- NGC_2818 wikiPageRevisionID "545547506".
- 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 hasPhotoCollection NGC_2818.
- NGC_2818 name "NGC 2818".
- NGC_2818 names "NGC 2818, PLN 261+8.1".
- NGC_2818 radiusLy "3.25".
- NGC_2818 sizeV "2.0".
- NGC_2818 subject Category:NGC_objects.
- NGC_2818 subject Category:Planetary_nebulae.
- NGC_2818 subject Category:Pyxis_(constellation).
- 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 label "NGC 2818".
- NGC_2818 label "NGC 2818".
- NGC_2818 label "NGC 2818".
- NGC_2818 label "NGC 2818".
- NGC_2818 label "NGC 2818".
- NGC_2818 label "NGC 2818".
- 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 m.05c539g.
- NGC_2818 sameAs Q939462.
- NGC_2818 sameAs Q939462.
- NGC_2818 wasDerivedFrom NGC_2818?oldid=545547506.
- NGC_2818 depiction NGC_2818_by_the_Hubble_Space_Telescope.jpg.
- NGC_2818 isPrimaryTopicOf NGC_2818.
