Planetary Nebula NGC 2346
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The Planetary Nebula NGC 2346 (also known as Butterfly NGC 2346 or NGC 2346) is a planetary nebula on the celestial equator in the Monoceros constellation. It is bright and conspicuous and has been extensively studied. Among its most remarkable characteristics is its unusually cool central star, which is a spectroscopic binary. The binary star, which has a period of about 16 days, is also variable, probably due to dust in orbit around it. The dust itself is heated by the central star and so NGC 2346 is unusually bright in the infrared part of the spectrum.