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Summary

Español: Comparación del tamaño y color de las tres estrellas de Alfa Centauri con nuestro sol.

A comparison of the sizes and colors of the stars in the Alpha Centauri system with the Sun.

File:Alpha Centauri relative sizes.svg is a vector version of this file. It should be used in place of this PNG file when not inferior.Category:Vector version available

File:Alpha Centauri relative sizes.png → File:Alpha Centauri relative sizes.svg

For more information, see Help:SVG.

In other languages

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David Benbennick made this image on January 29, 2005 with the following Metapost program as stars.mp:

verbatimtex
\font\foo=cmss9 at 10pt
\foo
etex

sunrad=0.3in;
alpharad = 1.227*sunrad;
betarad = 0.865*sunrad;
proximarad = 0.145*sunrad;
gap = 0.8*sunrad;

pair sunpos, alphapos, betapos, proximapos;
sunpos = (0 + gap + sunrad, 1.9*sunrad);
alphapos = sunpos + (sunrad + gap + alpharad, 0);
betapos = alphapos + (alpharad + gap + betarad, 0);
proximapos = betapos + (betarad + gap + proximarad, 0);

beginfig(1);

  fill unitsquare xscaled ((xpart proximapos) + proximarad + gap)
    yscaled (2 * (ypart sunpos));

  fill fullcircle scaled (2*sunrad) shifted sunpos
    withcolor (1,0.960,0.949);   % Color is fff1ed
  label.bot(btex Sun etex, sunpos - (0, sunrad)) withcolor white;

  fill fullcircle scaled (2*alpharad)
    shifted alphapos
    withcolor (1,0.960,0.949);
  label.bot(btex $\alpha$ Centauri A etex, alphapos - (0, alpharad))
    withcolor white;

  fill fullcircle scaled (2*betarad)
    shifted betapos
    withcolor (1,0.878,0.737);  % ffe0bc
  label.bot(btex $\alpha$ Centauri B etex, betapos - (0, betarad))
    withcolor white;

  fill fullcircle scaled (2*proximarad)
    shifted proximapos
    withcolor (1,0.752,0.411);  % ffcc6f
  label.bot(btex Proxima etex, proximapos - (0, proximarad))
    withcolor white;

endfig;
end;

And I had the following TeX file as stars.tex:

%&latex
\documentclass[10pt]{article}
 \usepackage{graphicx}
 \pagestyle{empty}
\begin{document}
 \includegraphics{stars.1}
\end{document}

Then I ran

mpost stars
tex stars
dvips -mode ljfzzz -D 1200 stars -o
convert -density 1200 -chop 99999x99999+6249+3463 -chop 2479x2095 stars.ps stars.png
pngcrush -reduce -brute -l 9 stars.png stars.crush.png

stars.crush.png was the final output file.

(Apparently it's non-trivial to get dvips to use a given resolution. I would have preferred to use 1600 dpi, but dvips didn't already have a "printer" at that resolution. ljfzzz, at 1200, was the best I could find.)

I, the copyright holder of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

Category:License migration redundant#Alpha%20Centauri%20relative%20sizes.png Category:GFDL#Alpha%20Centauri%20relative%20sizes.png

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.

	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.CC BY-SA 3.0truetrue

Category:CC-BY-SA-3.0-migrated#Alpha%20Centauri%20relative%20sizes.png

This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.

You are free:

to share – to copy, distribute and transmit the work
to remix – to adapt the work

Under the following conditions:

attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

Category:CC-BY-SA-2.0#Alpha%20Centauri%20relative%20sizes.png

You may select the license of your choice.

Category:Self-published work

References

I took the star colors from , which indicates they're only approximate. Apparently there are inherent difficulties in representing a star's color on a computer monitor.
I took the star radii from .

derivative works

Derivative works of this file: