Estimateur de Classe Spectrale
Estimez la classe spectrale d'une étoile selon sa température.
K
Spectral Class Code
3
Longueur d'onde maximale501.5 nm
Spectral Class Code vs Effective Temperature
Formule
Spectral Classification (OBAFGKM)
Stars are classified by surface temperature into spectral types:
The output code: 7=O, 6=B, 5=A, 4=F, 3=G, 2=K, 1=M.
Exemple Résolu
The Sun at 5778 K.
- 015778 K falls between 5200 and 6000 K.
- 02Spectral class: G (code 3)
- 03Peak wavelength: 2897800 / 5778 = 501.5 nm (green)
- 04The Sun is a G2V star.
Questions Fréquentes
What does OBAFGKM stand for?
The mnemonic "Oh Be A Fine Guy/Girl, Kiss Me" helps remember the order from hottest to coolest.
What are the subclasses (0-9)?
Each letter class is divided into 10 subclasses (0 = hotter, 9 = cooler). The Sun is G2, meaning near the hot end of the G class.
What about L, T, and Y classes?
These extend the sequence below M for brown dwarfs: L (1300-2000 K), T (500-1300 K), Y (< 500 K).