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Astronomy and Cosmology
Astronomy and Astrophysics
Alpha Centauri Orbits to Scale?
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[QUOTE="snorkack, post: 6827229, member: 436348"] And that´s inaccurate. Proxima is approximately 20 times closer to AB than Sun is. [URL]https://en.wikipedia.org/wiki/Alpha_Centauri#/media/File:Relative_positions_of_Sun,_Alpha_Centauri_AB_and_Proxima_Centauri.png[/URL] Note some nasty errors here. No proper error bars for the Proxima-AB distance. And I doubt that the Sun-Proxima-AB angle is known to minutes, let alone seconds! In terms of magnitude, AB is about 6,5 magnitudes brighter from Proxima than Sun. A is about -6,5, B is -5,2. Both are brighter than Venus from Earth (-4,4). They are also far brighter than the fixed stars - the brightest fixed star from Proxima is Sirius, too, but at -1,2 dimmer than from Sun. Sun is +0,5 - conspicuous but comparable to Betelgeuse, Procyon or Beta Centauri. In the sky of Proxima b, Alpha Centauri AB are by far the brightest objects after Proxima and Proxima d In terms of separation from each other... From Sun, AB true maximum separation is 26 seconds, but due to inclination and argument of apsides, the apparent maximum is just about 22 seconds and apparent minimum 1,7 seconds. What precisely is AB-s apparent orbit as viewed from Proxima - inclination, maximum and minimum separation, epochs? A separation in the region of 7...8 minutes would be easy for naked eye! It is quarter the width of full Moon. [/QUOTE]
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Astronomy and Cosmology
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Alpha Centauri Orbits to Scale?
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