Talk:NGC 2440
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Celsius versus kelvins[edit]
Information for Nasa's web site, Astronomy Picture of the Day (Feb 15, 2007) http://antwrp.gsfc.nasa.gov/apod/ap070215.html states a temperature of 200,000 Kelvins. This Wiki states 200,000 Celsius.
- At that size, the two units mean the same thing, however kelvins is more correct as used in the literature. I have change the article to kelvins and cited apod. WilliamKF (talk) 23:14, 11 December 2007 (UTC)
Dealing with inconsistent distances[edit]
An article in Astronomy magazine says that the central star of NGC 2440 lies about 7,100 light years from Earth. Yet a section of HubbleSite says that the nebula lies about 4,000 light years from Earth. Which is which? Micasta (talk) 02:11, 3 March 2009 (UTC)
- [1] 2.19 kpc 76.66.193.90 (talk) 07:27, 3 March 2009 (UTC)
Amazing! Thank you! :) Micasta (talk) 10:49, 3 March 2009 (UTC)
Magnitude of the nebula[edit]
The value of apparent magnitude originally written in this article was 18.9B. This is inconsistent with the values I've been seeing in the Internet, wherein the nebula was placed at a brighter 9 to 11th magnitude. The central star, however, is a faint star, at least 17.7 magnitude, so I assume that the 18.9B originally written in this article was the magnitude of the central star. Kindly contradict and correct if necessary. Thank you. :) Micasta (talk) 05:04, 4 March 2009 (UTC)
To add to this, the original value of magnitude given by Herschel was 9.1 . Micasta (talk) 05:06, 4 March 2009 (UTC)
Assessment comment[edit]
The comment(s) below were originally left at Talk:NGC 2440/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
| Information for Nasa's web site, Astronomy Picture of the Day (Feb 15, 2007) states a temperature of 200,000 Kelvins. This Wiki states 200,000 Celsius. This is quite a large discrepancy. |
Last edited at 13:52, 17 February 2007 (UTC). Substituted at 00:45, 30 April 2016 (UTC)