NGC 2440
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NGC 2440 is a planetary nebula, one of many in our galaxy. Its central star, HD62166,[1] is possibly the hottest known white dwarf. The nebula is situated in the Puppis constellation.
It was discovered by William Herschel on March 4, 1790. He described it as "a beautiful planetary nebula of a considerable degree of brightness, not very well defined."[3] The nebula is located about 1.23 kiloparsecs (3.79×1019 m) or about 4,000 light years from the Sun.[2]
HD 62166
HD 62166 has an exceptionally high surface temperature of about 200,000 kelvins[2] and a luminosity 1,100 times that of the Sun.[4] This dense star, with an estimated 0.6 solar mass and 0.028 solar radius,[4] has an apparent magnitude of 17.5.[5]
See also
External links
- Hubble Space Telescope reveals NGC 2440 on YouTube
- Astronomy Picture of the Day (15 February 2007): Planetary Nebula NGC 2440
- Astronomy Picture of the Day (7 May 2006): NGC 2440: Cocoon of a New White Dwarf
- Astronomy Picture of the Day (30 November 1995): NGC 2440 Nucleus: The Hottest Star?
Notes
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