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  1. Stellar Classification

    Linked via "multicolor photometry"

    Multicolor Photometry and Modern Calibration
    While pure spectral analysis defines the $\text{OBAFGKM}$ sequence, modern astrophysics relies heavily on multicolor photometry, such as the Sloan Digital Sky Survey ($\text{SDSS}$), to rapidly classify vast numbers of objects. These systems use defined filters to measure brightness in specific wavelength bands.
    The color indices derived from these filters ($U-B$, $B-V$, etc.) serve as proxi…