Talk:Kreutz sungrazer

message: I've had a bash at creating an image showing a 'family tree' of how the Kreutz group's major members have come to exist.  I think a nicely-done graphic could really illustrate the article well, but I'm not sure what I've done is very good at all, so thought I would put it here first.  Would appreciate comments, and if anyone can design a better-looking diagram that would be great! Worldtraveller 02:15, 25 Mar 2005 (UTC)
replies: text: On your image there is a confusion between groups I and II. This image is incorrect and should be deleted. Instead of this I inserted an original image by Sekanina (2004). I requested deletion of this image on Wikimedia Commons. — Chesnok (talk) 08:03, 29 October 2008 (UTC)
replies: text:  Did you copy-paste the image from the Sekanina's article? Ruslik (talk) 12:12, 29 October 2008 (UTC)
replies: text:  Yes, I did. I think, this image is a simple chart and ineligible for copyright. — Chesnok (talk) 09:39, 30 October 2008 (UTC)
replies: text:  Copy-paste=copyvio. The diagram should be independently recreated, not copied. Ruslik (talk) 10:59, 30 October 2008 (UTC)
replies: text:  ✔ Done. — Chesnok (talk) 09:01, 3 November 2008 (UTC)
thread_title: A family tree image

message: The images in particular, both of the sungrazer and the family tree above, make my heart sing.  +sj + 05:56, 28 Mar 2005 (UTC)
replies: text: Excellent, very pleased to hear it!  In the hope that it might make more hearts sing I've now put the image on the article page.  Worldtraveller 14:13, 28 Mar 2005 (UTC)
thread_title:  Delightful! 

message: I've recalculated the numbers in the section describing the brightness of the Sun as seen from a sungrazer - here's my thinking:
#Earth is about 215 solar radii away from the Sun.  The sungrazer in question was 1.3 solar radii away from the centre of the Sun.  It was 165 times closer, so the Sun would have appeared 165 times wider than it does to us.  It's about 0.5° across from here so over 80° across from there.
#The angular area of the Sun from the comet would be (165)² times greater than it is from Earth; and the amount of light received would also be (165)² times greater (inverse square law).
#The solar constant at Earth is 1.37kW/m².  This also follows an inverse square law, so would be (165)² times greater at the Sungrazer: 37.3MW/m²
Does that make sense? Worldtraveller 09:29, 18 August 2005 (UTC)
thread_title: Brightness of Sun from sungrazing comet

message: I randomly stumbled on this article while perusing a list of articles with "Great" in the name and arriving here from Great Comet of 1882. Really nice introduction to something I hadn't heard of before. Carcharoth 15:02, 20 January 2007 (UTC)
thread_title:  Nice article 

message: Per the Great Comet of 1882 article as cited there:
:Current models do not support the frequent supposition in the prior literature that the famous comet of 372 BC is in fact the ultimate parent of the Sungrazers. The comet of 372 BC is often associated with Aristotle who, along with others from his time, described that comet in his writings. However, Aristotle was only twelve at the time of the comet's appearance and the historian, Callisthenes of Olynthus, who also wrote about it was born ten years after its appearance. Consequently, their reports should not be taken as eye-witness accounts. Further, there is no mention of the comet in Chinese literature of the time. Instead either the comet of February 423 or of February 467 with orbital periods of around 700 years is now considered the likely progenitor of the Sungrazers. The fragments of the Great Comet of 1882 will return in several hundred years time, spread out over perhaps two or three centuries.
I think this article needs to be updated to reflect this modern opinion.  The diagram of the family tree would need to be updated.
WilliamKF 02:35, 19 October 2007 (UTC)
replies: text: I update the article in this respect. Ruslik (talk) 12:11, 29 October 2008 (UTC)
thread_title:  Not a descendant of Aristotle's comet 

message: The audio link on the pronunciation of Kreutz actually links to the word "sungrazers". Rsduhamel (talk) 20:07, 9 July 2009 (UTC)
thread_title:  Audio link 

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thread_title:  External links modified 

message: This 2005 WP:FA promotion was last reviewed in 2008 and has not been maintained to WP:WIAFA standard.  Unless these issues can be addressed, the article should be submitted for a Featured article review:
* There is uncited text.
* There is sub-standard prose (sample, Subgroup I also includes comets seen in 1695, 1880 (Great Southern Comet of 1880) and in 1887 (Great Southern Comet of 1887), as well as the vast majority of comets detected by the SOHO mission (see below).
* MOS:CURRENT, recent and recently with no date context.
* Sources dating to the last FAR, with text that has no date context, sample: The number of Subgroup I Kreutz comets discovered is about four times the number of Subgroup II members. This suggests that the 'grandparent' comet split into parent comets of unequal size.[2]
* Poorly formatted citations including bare URLs.
* Items in external links indicating the article is outdated.
It does not appear that the article has been maintained since its 2008 FAR; a top-to-bottom review is needed to maintain FA status. SandyGeorgia (Talk)  21:04, 21 March 2021 (UTC)
thread_title:  Featured article review needed 

message: From the article on may 13, 2022: "The first comet whose orbit had been found to take it extremely close to the Sun was the Great Comet of 1680. This comet was found to have passed just 200,000 km (0.0013 AU) above the Sun's surface, equivalent to around a seventh of Sun's diameter, or about half the distance between the Earth and the Moon. It thus became the first known sungrazing comet. Its perihelion distance was just 1.3 solar radii." 1.3 radius of a sphere is 0.65 of a diameter. 1/7 of a diameter is 0.14 of a diameter or 0.29 of a radius.Rich (talk) 19:40, 13 May 2022 (UTC)
replies: text: I've added a short explanation(there was an explanation already, long ago) that perihelion is calculated from the Sun's center.Rich (talk) 03:43, 14 May 2022 (UTC)
thread_title:  Discrepancy? 1.3 radii is 0.65 diameters 

message: Does anyone have a source for this addition? Jo-Jo Eumerus (talk) 07:42, 15 November 2023 (UTC)
replies: text: Removed it for lack of source:  I find it plausible, but sans source it can't stay. Jo-Jo Eumerus (talk) 08:39, 3 January 2024 (UTC)
thread_title:  Addition that needs comment