NGC 2440
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 constellation Puppis.
| Emission nebula | |
|---|---|
| Planetary nebula | |
 NGC 2440, as taken by the Hubble Space Telescope | |
| 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 |
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]
gollark: I went to lunch while in it. Oops.
gollark: Even besides that, you should specifically deny access to the shop itself rather than ALL WOLFMALL.
gollark: I can't tell if you're serious.
gollark: §8[195,73,94][PM] §5[ §nSELL SHOP§5 ]: §bHey gollark, you've been standing in the cabin for a while now. Make sure than after you're done, you'll make place for others. Excessive §4afking§b in the cabin is §alogged§b, and you may be §4denied access§b to Wolf Mall when you're unneccesarely obstructing the SELL SHOP for others! Thank you kindly for understanding!
gollark: It's an internal API which I expose for reasons, like skynet.URL.
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, 34 (4): 34–39, Bibcode:2006Ast....34d..34J External link in
|journal=(help) - O'Meara, Stephen James (2007), "Albino Butterfly, Kiss Nebula, Little Lips Nebula: NGC 2440", Hidden Treasures: 204–208
External links
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Wikimedia Commons has media related to NGC 2440. |
- 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)
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