Add Color Temperature and RGB Color

[mienaikoe]

On Cosmosis, we used some equations we found online to calculate the Color Temperature, and subsequently the RGB color, from the B-V Color.
You can find our ruby implementation here:
https://github.com/HacktheUniverse/cosmos/blob/master/data/speck/stars.rb

It would be great to get this data into the API so star color could be implemented without frontend calcuation.

[nicholalexander]

@mienaikoe - Awesome idea, thanks! i think we can make a new rake task like rake:star:add_rgb which goes through the database and calculates rgb (and that second number - which is the same as lumbinosity - is being used on the front as the alpha in the rgba, yes?

[mienaikoe]

Well the luminosity isn't used in that method. It's a relic from doing that method at midnight.

Luminosity could be factored in if you want. Maybe absolute magnitude would be more suited to the task? I don't know enough about astronomy to comment on that.

I like the rake task idea though.

[nicholalexander]

OK cool. Let's keep it as a pure rgb calculation. Really cool idea, thanks!
On Nov 14, 2014 12:05 PM, "Jesse" notifications@github.com wrote:

Well the luminosity isn't used in that method. It's a relic from doing
that method at midnight.

Luminosity could be factored in if you want. Maybe absolute magnitude
would be more suited to the task? I don't know enough about astronomy to
comment on that.

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#40 (comment)
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[surenm]

@nicholalexander Do you want to fix this up?