NGC 2440
| Nebula | |
|---|---|
 | |
| Observation data: J2000 epoch | |
| Right ascension | 07h 41m 54.91s[1] |
| Declination | −18° 12′ 29.7″[1] |
| Distance | 4.00 kly (1.23 kpc)[2] ly |
| Apparent magnitude (V) | 9.4[3] |
| Apparent dimensions (V) | 74" × 42"[3] |
| Constellation | Puppis |
| Designations | ESO 560-PN9 |
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
Notes
References
- SIMBAD (January 9, 2007), Results for NGC 2440, SIMBAD, Centre de Données Astronomiques de Strasbourg
- Nemiroff, R.; Bonnell, J., eds. (February 15, 2007). "Planetary Nebula NGC 2440". Astronomy Picture of the Day. NASA.
- James, Renée; Marion, Howie (April 2006), "X-treme Stars of the cosmos", Astronomy, Kalmbach Publishing Co., 34 (4): 34–39 External link in
|journal=(help) - O'Meara, Stephen James (2007), "Albino Butterfly, Kiss Nebula, Little Lips Nebula: NGC 2440", Hidden Treasures, Cambridge University Press: 204–208
External links
- Hubble Space Telescope reveals NGC 2440 on YouTube
- NASA Astronomy Picture of the Day: Planetary Nebula NGC 2440 (15 February 2007)
- NASA Astronomy Picture of the Day: NGC 2440: Cocoon of a New White Dwarf (7 May 2006)
- NASA Astronomy Picture of the Day: NGC 2440 Nucleus: The Hottest Star? (30 November 1995)
This article is issued from Wikipedia - version of the 11/2/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.