"Modern" constellations would be the ones named after objects not known to the ancient astronomers, instead of animals and mythology.
"Constellations in the Lacaille family, introduced by French astronomer Nicolas Louis de Lacaille in 1756, are also all located in the southern celestial hemisphere. These are Antlia (the Air Pump), Caelum (the Chisel), Circinus (the Compass), Fornax (the Furnace), Horologium (the Pendulum Clock), Mensa (Table Mountain), Microscopium (the Microscope), Norma (the Level), Octans (the Octant), Pictor (the Painter’s Easel), Reticulum (the Reticle), Sculptor and Telescopium (the Telescope).
Lacaille created these constellations while observing the southern skies from an observatory on Table Mountain in South Africa. They were not visible to ancient civilizations in Europe."