… stars, merged photometry.
Color–magnitude diagram: pick the two bands forming the color (X) and the band plotted as magnitude (Y, inverted, brighter stars toward the top). Point size scales with the first band's brightness. Drag to pan, scroll to zoom, double-click to reset the view. Hover a point for a quick readout; click one to open its detail panel with a sky cutout. Fields with 3+ bands can switch to a color–color diagram below. Use the Brush tool (or shift-drag) to select a group of stars by box or lasso.
Starting…
Prototype viewer, renderer and data format adapted from galaxy-manifold. Density is shown with a perceptual (magma-like) colormap and an auto-estimated exposure that re-fits as you pan and zoom.