NGC 2440 is a planetary nebula, one of many in our galaxy. Its central star, HD62166, is possibly the hottest known white dwarf. The nebula is situated in the Puppis constellation. It was discovered by William Herschel on Mar. 4, 1790 (222 years ago). He described it as "a beautiful planetary nebula of a considerable degree of brightness, not very well defined." The nebula is located about 1.23 kiloparsecs (3.79×1019 m) or about 4,000 light years from the Sun.

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