Ikhtisar

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.)

Ambo, pamegang hak cipta karya ko, basamo ko malakekan berkas ko jo lisensi barikuik:

Diizinan untuak manyalin, mandistribusian dan/atau mamodifikasi dokumen ko jo syaraik-syaraik Lisensi Dokumentasi Bebas GNU, Versi 1.2 atau labiah baru nan dikaluaan dek Free Software Foundation; tanpa Bagian Invarian, tanpa Teks Sampul Muko, dan tanpa Teks Sampul Balakang. Salinan lisensi dimasuakan ka bagian nan bajudul Lisensi Dokumentasi Bebas GNU.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Berkas iko di bawah lisensi Creative Commons Atribusi-BerbagiSerupa 3.0 Tanpa Adaptasi
	Sanak bebas: untuak babagi – untuak manyalin, manyebarkan, jo mangirimkan karya untuak mancampua – untuak mangadaptasi karya Di bawah kondisi barikuik: atribusi – Sanak musti maagiah atribusi karya ko jo caro nan ditantuan dek pambuek atau pamacik lisensi (tapi indak jo caro apo pun nan mancaminkan Sanak dipaso atau panggunoan Sanak pado karya tasabuik). babagi sarupo – Kok Sanak maubah, mangganti, atau mambuek turunan dari materi ko, Sanak musti manyebaluaskan jariah Sanak di bawah lisensi nan samo jo materi asali.
	Label lisensi ko ditambahkan pado berkas sabagai bagian dari pambaruan lisensi 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

Sanak bebas:

• untuak babagi – untuak manyalin, manyebarkan, jo mangirimkan karya
• untuak mancampua – untuak mangadaptasi karya

Di bawah kondisi barikuik:

• atribusi – Sanak musti maagiah atribusi karya ko jo caro nan ditantuan dek pambuek atau pamacik lisensi (tapi indak jo caro apo pun nan mancaminkan Sanak dipaso atau panggunoan Sanak pado karya tasabuik).
• babagi sarupo – Kok Sanak maubah, mangganti, atau mambuek turunan dari materi ko, Sanak musti manyebaluaskan jariah Sanak di bawah lisensi nan samo jo materi asali.

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

Sanak dapek mamiliah lisensi surang.

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