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{{Night Sky
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}}''Not to be confused with the [[Egg nebula]]''
The '''Calabash nebula''' (OH 231.84 +4.22) is a [[protoplanetary nebula]] in the [[constellation]] of [[Puppis]].<ref name=constellation-guide/> It is believed to be located in the [[open cluster]] Messier 46 since it lies at the same distance of 5,000 [[light year]]s and also has the same radial velocity and proper motion.<ref name=constellation-guide/> The name Calabash was proposed due to its unusual shape.<ref>Icke, V. and Preston, H. (1989). The dynamics of the Calabash Nebula. ''Astronomy and Astrophysics'', 211(2), p.410. [http://adsabs.harvard.edu/abs/1989A&A...211..409I Bibcode:1989A&A...211..409I]</ref> The nebula is occasionally referred to as the "Rotten egg nebula" due to the large quantities of [[sulphur]] present in the nebula (sulphur often smells like rotten eggs when combined with various elements).<ref name=nasa>[https://www.nasa.gov/image-feature/goddard/2017/hubble-captures-brilliant-star-death-in-rotten-egg-nebula Hubble Captures Brilliant Star Death in “Rotten Egg” Nebula] from nasa.gov</ref>
The '''Calabash nebula''' (OH 231.84 +4.22) is a [[protoplanetary nebula]] in the [[constellation]] of [[Puppis]].<ref name=constellation-guide/> It is believed to be located in the [[open cluster]] Messier 46 since it lies at the same distance of 5,000 [[light year]]s and also has the same radial velocity and proper motion.<ref name=constellation-guide/> The name Calabash was proposed due to its unusual shape.<ref>Icke, V. and Preston, H. (1989). The dynamics of the Calabash Nebula. ''Astronomy and Astrophysics'', 211(2), p.410. [http://adsabs.harvard.edu/abs/1989A&A...211..409I Bibcode:1989A&A...211..409I]</ref> The nebula is occasionally referred to as the "Rotten egg nebula" due to the large quantities of [[sulphur]] present in the nebula (sulphur often smells like rotten eggs when combined with various elements).<ref name=nasa>[https://www.nasa.gov/image-feature/goddard/2017/hubble-captures-brilliant-star-death-in-rotten-egg-nebula Hubble Captures Brilliant Star Death in “Rotten Egg” Nebula] from nasa.gov</ref>