Load catalogue
The app loads data/hyg_v44.csv automatically when served over HTTP.
If that fails, load the file manually below.
or
drag & drop the CSV here
Visualization
Stellar Properties
Derived values are computed from catalogue colour index, magnitude and spectral type — they are not measured quantities stored in HYG.
Harvard Spectral Classification
HYG is built from Hipparcos, Yale BSC and Gliese, so it contains essentially no L / T / Y brown dwarfs — those classes are shown for completeness only.