Talk:Thuban

message: Is there a source for this? Since Bayer was judging magnitude by eye - photometric devices not being invented until long after his time - simple error presents itself as another explanation.  —Preceding unsigned comment added by Orcoteuthis (talk • contribs) 16:48, 9 January 2008 (UTC)
replies: text: I put that in there years ago. There's not really any other reasonable explanation for why Thuban would be designated as Alpha Draconis than its historical significance. No astronomer could have erroneously thought Thuban was actually the brightest star in Draco. It's not even close. Eltamin outshines it by a full 1.3 magnitudes. Bayer was too good to have made an error that large. Jsc1973 (talk) 04:18, 26 November 2012 (UTC)
replies: text: Here's a source that agrees with what I wrote all those years ago: http://stars.astro.illinois.edu/sow/thuban.html Jsc1973 (talk) 09:25, 22 February 2016 (UTC)
thread_title: The Alpha designation is apparently due to its history as the ancient pole star.

message: Logic would say that the pole stars lie in a circle, so.... follow up from present til we get to thuban again and therfor, we have thubans forrunner as pole star.--Jakezing (talk) 15:16, 9 October 2008 (UTC)
replies: text: More than "logic" tells us this. We know it to be true. Look up Pole star and Precession. Thuban will be the North Star again in about 18,500 years, and will again have a long reign as such. People 25,000 years from now will have Polaris as the North Star, just like today, and there are a few others in between them. Jsc1973 (talk) 09:18, 22 February 2016 (UTC)
thread_title:  Previous Pole Star 

message: Th'uban in Arabic means Snake  (ar) ثعبان 
see List_of_the_star_names_in_Draco Salem F (talk) 17:19, 2 September 2009 (UTC)
thread_title: Th'uban is not mean Dragon in arabic

message: Is there any references to this star as the Pole Star in Sumerian or Akkadian sources?  —Preceding unsigned comment added by 193.11.220.249 (talk) 20:59, 8 September 2009 (UTC)
replies: text: I'm not sure, but there is a tentative identification with the Babylonian MU-BU-KESH-DA on Table 3a of Rogers (1998). However, R.H. Allen associated this star with theta ophiuchi, so who knows?—RJH (talk) 19:54, 27 October 2009 (UTC)
thread_title:  References in Sumer / Akkadian empire 

message: The statement that the secondary is of low mass and likely some kind of dwarf has been here since before the article had any references. OTOH the sourced figure in the infobox is 2.2 suns, a clear contradiction. Red dwarfs are at most about half the Sun‘s mass, while white dwarfs are subject to the Chandrasekhar limit of about 1.4 suns. Any objections to my removing or revising this remark?—Odysseus1479 02:02, 11 July 2015 (UTC)
replies: text: The article in general is full of uncited statements to varying degrees of believability.  I've tagged the main offenders.  The sentence you refer to looks like a bit of own research from before anyone had any clue what the mass of the secondary really was. Lithopsian (talk) 19:47, 11 July 2015 (UTC)
replies: text: Thanks. Noting that Kallinger et al. (2004) determined 2.2  as a minimum (AIUI the upper bound being from its invisibility in the glare of the primary), I’ve found Behr et al (2009), who used a different method to get ~2.6 , for a spectral type around A2V (or earlier, I guess) and a luminosity about one-sixth of the primary’s. Thus a largish main-sequence dwarf, somewhat bigger than Sirius but perhaps under-luminous for the class, at any rate not a red or white dwarf.—Odysseus1479 22:15, 11 July 2015 (UTC)
thread_title:  Companion a dwarf? 

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thread_title:  External links modified