Monday, September 12, 2016

A footnote: The color on other planets

I was doing further work on the Fish Map [more on that in another post] and in trying to organize my resources [a number of star catalogs from NASA and The VizieR site at the University of Strasbourg. In the process  I found an HTML file that had the title "Table of Features of the "Life Zones" of Main Sequence Stars" I had saved some time in the past into my collection of information of "Habitable Stars". While the original web site is defunct I was able to locate it with the Internet Archive Wayback machine HERE

The original page was written by Gregg Geist who among other things has a BS in astronomy from the University of Arizona. He noted on the table page: "Most of the data used to generate the table were gleaned from Kenneth R. Lang, Astrophysical Data: Planets and Stars (Springer-Verlag, 1992). Other information was derived directly from the H. R. diagrams produced by the Hipparcos Astrometry Mission and available at: http://astro.estec.esa.nl/Hipparcos/"

The page is fascinating because it shows what a "white sun" and a grey card would look like with normal human vision. I edited the table slightly and present a excerpt below:

Spectral Type Example
Star
Photo Color
White Sun
Photo Color
Gray Card




G2 Sun a




M7 Proxima Centauri

K0 Alpha Centauri B
G9
G5
G4
G2 Mu Velae B
G0 Alpha Centauri A
F8
F6

Now you have some idea what sunlight and grey might look like on another planet orbiting another star.

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