| 词条 | Lemon Slice Nebula |
| 释义 |
| image = |caption=Image of IC 3568 based on HST data | name = IC 3568 | type = Planetary nebula | epoch = J2000 | ra = {{RA|12|33|06}} | dec = {{DEC|+82|34|00}} | dist_ly = Roughly 4.5⋅103 | appmag_v = 12.3 | size_v = | constellation = Camelopardalis | radius_ly = Core: 0.2 | absmag_v = | notes = | names = IC 3568 }} IC 3568 is a planetary nebula that is 1.3 kiloparsecs (4500 ly) away from Earth in the constellation of Camelopardalis (just 7.5 degrees from Polaris). It is a relatively young nebula and has a core diameter of only about 0.4 light years. It was dubbed the Lemon Slice Nebula by Jim Kaler, due to its appearance in one false-colour image from the Hubble Space Telescope.[1][2] The Lemon slice nebula is one of the most simple nebulae known, with an almost perfectly spherical morphology. The core of the nebula does not have a distinctly visible structure in formation and is mostly composed of ionized helium.[3] A faint halo of interstellar dust surrounds the nebula. References1. ^IC 3568 {{nebula-stub}}2. ^Portal to the Universe.org 3. ^starrycritters.com 3 : Planetary nebulae|Camelopardalis (constellation)|IC objects |
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