Summary
All stars are assigned a spectral class, generally composed of three coded characters. For example, the pre-release star Ethaedair is listed with a spectral class of G2m. This indicates that it is one of the hotter yellow stars, and with enhanced metals. The following information is based on the stars in our universe, but should give an idea of what may be seen in the game.
Class
The first character is the star's class (listing Class, Temperature and Color):
| CLASS | TEMPERATURE | COLOR |
| O | ≥ 30,000 K | blue |
| B | 10,000-30,000 K | blue-white |
| A | 7,500-10,000 K | white |
| F | 6,000-7,500 K | yellow white |
| G | 5,200-6,000 K | yellow |
| K | 3,700-5,200 K | orange |
| M | 2,400-3,700 K | red |
| L | 1,300-2,400 K | red brown |
| T | 500-1,300 K | brown |
| Y | ≤ 500 K | dark brown |
Relative Temperature
The second character provides a heat range within a specific class. A star rated G3 would represent a hotter temperature than G8.
Oddities
The third character indicates any oddities for the star. Note that entries referring to spectral lines or specific elements such as hydrogen would be distinctly different in the universe of No Man's Sky.
- e = Emission lines present
- h = WR stars with emission lines due to hydrogen
- k = Spectra with interstellar absorption features
- m = Enhanced metal features
- n = Broad ("nebulous") absorption due to spinning
- p = Unspecified peculiarity
- q = Red & blue shifts line present
- s = Narrowly "sharp" absorption lines
- v = Variable spectral feature
- w = Weak lines