{{Infobox nebula
| image =
| name = NGC 2440
| epoch = J2000
| ra =
| dec =
| appmag_v = 9.4
| size_v = 74" × 42"。這顆白矮星大約是0.6倍太陽質量和0.028倍太陽半徑，視星等是 18.9。
外部連結
- [http://youtube.com/watch?v=bValYkI2WKA Hubble Space Telescope reveals NGC 2440] on YouTube
- [http://antwrp.gsfc.nasa.gov/apod/ap070215.html Astronomy Picture of the Day (15 February 2007): Planetary Nebula NGC 2440]
- [https://web.archive.org/web/20090307120023/http://antwrp.gsfc.nasa.gov/apod/ap060507.html Astronomy Picture of the Day (7 May 2006): NGC 2440: Cocoon of a New White Dwarf]
- [https://web.archive.org/web/20090303130147/http://antwrp.gsfc.nasa.gov/apod/ap951130.html Astronomy Picture of the Day (30 November 1995): NGC 2440 Nucleus: The Hottest Star?]
註釋
參考資料
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