Lemon slice nebula
Encyclopedia
The Lemon slice nebula, or IC 3568, is a planetary nebula
Planetary nebula
A planetary nebula is an emission nebula consisting of an expanding glowing shell of ionized gas ejected during the asymptotic giant branch phase of certain types of stars late in their life...

 1.3 kiloparsecs (4500 ly) away in the constellation Camelopardalis
Camelopardalis
Camelopardalis is a large but faint constellation in the northern sky. The constellation was introduced in 1612 by Petrus Plancius. Some older astronomy books give an alternative spelling of the name, Camelopardus.-Etymology:...

 (just 7.5 degrees from Polaris
Polaris
Polaris |Alpha]] Ursae Minoris, commonly North Star or Pole Star, also Lodestar) is the brightest star in the constellation Ursa Minor. It is very close to the north celestial pole, making it the current northern pole star....

).It has a diameter of 0.4 lightyears. The Lemon slice nebula is one of the most simple nebulae known.
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