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Anyone have a date for when Thuban became the Pole Star? I found its closes approach, and the time when it lost the title to Kochab, but not when it got it first. I seem to recall a table of pole stars in S&T or Astronomy lo! these many years ago, buy my memory is not that good. Rummaging around on the web produces nothing much.... -- Paul Drye
It started being useful for that purpose around 3300 BC, and was better than Kochab all the way up to about 1900 BC, as mentioned before. In fact, during its entire career as pole star, it was better than Kochab ever was. At about 2750, it was almost dead-on with the pole, and even better than Polaris is today. This chart: http://www.recoveredscience.com/Fig1-8%20zoom%20to%20sky%20pole.gif will give you an idea.
I ran star charts during the times in question, using SkyChart III, and came up with the new values entered in the article. Thuban was closest to the pole for even longer than I thought it was. user:Jsc1973
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)
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)
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)
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)
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?— Odysseus 147 9 02:02, 11 July 2015 (UTC)
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Anyone have a date for when Thuban became the Pole Star? I found its closes approach, and the time when it lost the title to Kochab, but not when it got it first. I seem to recall a table of pole stars in S&T or Astronomy lo! these many years ago, buy my memory is not that good. Rummaging around on the web produces nothing much.... -- Paul Drye
It started being useful for that purpose around 3300 BC, and was better than Kochab all the way up to about 1900 BC, as mentioned before. In fact, during its entire career as pole star, it was better than Kochab ever was. At about 2750, it was almost dead-on with the pole, and even better than Polaris is today. This chart: http://www.recoveredscience.com/Fig1-8%20zoom%20to%20sky%20pole.gif will give you an idea.
I ran star charts during the times in question, using SkyChart III, and came up with the new values entered in the article. Thuban was closest to the pole for even longer than I thought it was. user:Jsc1973
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)
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)
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)
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)
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?— Odysseus 147 9 02:02, 11 July 2015 (UTC)
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Cheers.— InternetArchiveBot ( Report bug) 12:40, 2 December 2017 (UTC)
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