Chat vs. Meteors: the stars and constellation figures
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Stars
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Positions (J2000), V magnitudes and B-V colours of the stars in the game's
sky come from the Yale Bright Star Catalogue, 5th revised edition:
Hoffleit, D. & Warren Jr., W. H. (1991), The Bright Star Catalogue, 5th
Revised Ed., Astronomical Data Center, NSSDC/ADC. Retrieved from CDS/VizieR,
catalogue V/50 (https://cdsarc.cds.unistra.fr/viz-bin/cat/V/50).

Constellation figures
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Orion, the Big Dipper, Cassiopeia, the Southern Cross and the Northern
Cross are drawn from those same catalogue stars, at their true places
relative to one another and their real magnitudes. The lines between them
are the familiar stick figures, drawn by us.