Talk:NGC 2440

Celsius versus kelvins
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
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)


 * 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
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
Substituted at 00:45, 30 April 2016 (UTC)