File:Alpha Centauri relative sizes.svg
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Alpha_Centauri_relative_sizes.svg (SVG file, nominally 452 × 164 pixels, file size: 17 KB)
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Contents |
[edit] Summary
| Description |
English: A comparison of the sizes and colors of the stars in the Alpha Centauri system with the Sun.
Español: Comparación del tamaño y color de las tres estrellas de Alfa Centauri con nuestro sol.
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|---|---|
| Date |
Original bitmap uploaded January 29, 2005, SVG version uploaded 2007-07-10. |
| Source |
SVG rendering of the program used to generate the bitmap image Image:Alpha_Centauri_relative_sizes.png |
| Author |
|
| Permission (Reusing this image) |
See below. |
| Other versions | Bitmap rendering of almost identical program: Image:Alpha_Centauri_relative_sizes.png |
[edit] Source code
| This vector image was created with MetaPost. |
Created with w:MetaPost using the following input file:
prologues := 3;
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;
The following commands were used to compile this into an SVG file:
mpost fig.mp ps2pdf -dEPSCrop fig.1 fig.pdf pstoedit -page 1 -dt -xscale 2 -yscale 2 -f sk fig.pdf fig.sk inkscape -z --vacuum-defs -f fig.sk -l fig.svg
[edit] References
- I took the star colors from [1], 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 [2].
[edit] Licensing
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:22, 9 July 2008 | | 452×164 (17 KB) | Qef | ({{Information |Description={{en|1={{en|A comparison of the sizes and colors of the stars in the Alpha Centauri system with the Sun.}} {{es|Comparación del tamaño y color de las tres estrellas de Alfa Centauri con nuestro sol.}}}} |S) |
File links
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