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・ NGC 2360
・ NGC 2362
・ NGC 2363
・ NGC 2363-V1
・ NGC 2366
・ NGC 2371-2
・ NGC 2374
・ NGC 2397
・ NGC 24
・ NGC 2403
・ NGC 2419
・ NGC 2423-3
・ NGC 2423-3 b
・ NGC 2438
・ NGC 2439
NGC 2440
・ NGC 2441
・ NGC 2442/2443
・ NGC 2451
・ NGC 2452
・ NGC 246
・ NGC 2467
・ NGC 247
・ NGC 2477
・ NGC 248
・ NGC 249
・ NGC 25
・ NGC 250
・ NGC 2500
・ NGC 2506


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NGC 2440 : ウィキペディア英語版
NGC 2440

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 March 4, 1790. 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.〔
==HD 62166==

HD 62166 has an exceptionally high surface temperature of about 200,000 kelvins〔 and a luminosity 1,100 times that of the Sun. This dense star, with an estimated 0.6 solar mass and 0.028 solar radius,〔 has an apparent magnitude of 17.5.〔http://observing.skyhound.com/archives/feb/NGC_2440.html〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「NGC 2440」の詳細全文を読む



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