If you would like to know HTML, HEX, RGB, CMYK and HSV values of a Color, then portable freeware Pixie will be able to help you.

Hex codes are a simple, unambiguous way to designate colors in digital media. However, going from a color in your head to a hex code can be difficult for the unpracticed.

Hex Invaders will teach you the logic behind hexadecimal colors. The code is really just based upon RGB values. Once you learn that, the game hands you a blaster, and sends aliens your way.

A VB6 or (Visual Basic 6) program can be used to find RGB values of a color. Some knowledge of programming concepts and languages such as Visual Basic is required to write a program code in VB6. Basic ...

He has other star colors listed as well. I found the codes for different stellar types interesting. The star type is listed, along with the RGB and hex values.