Ringkesan

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

File:Alpha Centauri relative sizes.svg merupakan versi vektor dari berkas ini. Berkas itu harus digunakan menggantikan gambar raster ini jika kualitasnya tidak rendah. File:Alpha Centauri relative sizes.png → File:Alpha Centauri relative sizes.svg Untuk informasi lanjutan, lihat Bantuan:SVG. Dalam bahasa lainnya Alemannisch ∙ Bahasa Indonesia ∙ Bahasa Melayu ∙ British English ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ eesti ∙ English ∙ español ∙ Esperanto ∙ euskara ∙ français ∙ Frysk ∙ galego ∙ hrvatski ∙ Ido ∙ italiano ∙ lietuvių ∙ magyar ∙ Nederlands ∙ norsk bokmål ∙ norsk nynorsk ∙ occitan ∙ Plattdüütsch ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ Scots ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ suomi ∙ svenska ∙ Tiếng Việt ∙ Türkçe ∙ vèneto ∙ Ελληνικά ∙ беларуская (тарашкевіца) ∙ български ∙ македонски ∙ нохчийн ∙ русский ∙ српски / srpski ∙ татарча/tatarça ∙ українська ∙ ქართული ∙ հայերեն ∙ বাংলা ∙ தமிழ் ∙ മലയാളം ∙ ไทย ∙ 한국어 ∙ 日本語 ∙ 简体中文 ∙ 繁體中文 ∙ עברית ∙ العربية ∙ فارسی ∙ +/−

 

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.)

Kula, sing nduwèni hak cipta karya iki, mawa iki nerbitaké berkas iki sakisoré lisènsi kasebut:

Idih kawènèhaké saprelu nyalin, ngedum, lan/utawa ngowah layang iki manut bebaku Palilah Pilayang Bébas GNU, Angka 1.2 utawa angka luwih anyar sing dibabar Yeyasan Piranti Alus Bébas; tanpa Pérangan Invarian, tanpa Tulisan Samak Arep, lan tanpa Tulisan Samak Buri. Salinan palilah dirembug ing pérangan asesirah Palilah Pilayang Bébas GNU.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Barkas iki kalilakaké sangisoring palilah Creative Commons Atribusi-Andum Mèmper 3.0 Tanpa Adhaptasi.
	Kowé kena: ngedum – nyalin, nyebar, lan ngirim karya nyampur – ngolah karya Sangisoré kahanan mangkéné: atribusi – Kowé kudu mènèhi krédhit kang patut, mènèhi pranala lisènsi, lan kandha yèn ana owah-owahan. Kowé bisa tumindak sasenengmu, nanging ora teges kang duwé lisènsi njurung lakumu. andum mèmper – Manawa kowé nyalin rupa, ngowahi, utawa nggawé karya nganggo bahan karya iki, kowé kudu mbabar karyamu kang wis dadi nganggo lisènsi kang padha utawa kang cocog karo karya asliné..
	Tag lisènsi iki ditambahaké nèng berkas iki minangka bagéyané panganyaran lisènsi GFDL.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

Berkas ini dilisensikan di bawah lisensi Creative Commons Atribusi-Berbagi Serupa 2.0 Generik

Kowé kena:

• ngedum – nyalin, nyebar, lan ngirim karya
• nyampur – ngolah karya

Sangisoré kahanan mangkéné:

• atribusi – Kowé kudu mènèhi krédhit kang patut, mènèhi pranala lisènsi, lan kandha yèn ana owah-owahan. Kowé bisa tumindak sasenengmu, nanging ora teges kang duwé lisènsi njurung lakumu.
• andum mèmper – Manawa kowé nyalin rupa, ngowahi, utawa nggawé karya nganggo bahan karya iki, kowé kudu mbabar karyamu kang wis dadi nganggo lisènsi kang padha utawa kang cocog karo karya asliné..

https://creativecommons.org/licenses/by-sa/2.0CC BY-SA 2.0 Creative Commons Attribution-Share Alike 2.0 truetrue

Kowé bisa milih lisènsi kang koarepaké.

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].

derivative works

Derivative works of this file:

• Alpha Centauri relative sizes-it.png
• Alpha Centauri relative sizes-nl.png
• Alpha Centauri relative sizes-sv.png