[4] The Catalog of Components of Double and Multiple Stars lists Pismis 24-1 as having two fainter companions 5.5 and 16.4 arcseconds distant.

[7] The two components of Pismis 24-1NE cannot be detected separately, but analysis of their eclipses shows that they are almost identical, with temperatures around 42,000 K. The pair combined is nearly 800,000 times as luminous as the sun, making each individual star likely to be under 400,000 L☉.

The spectral type of the combined object is O3.5 If* indicating an expanded star with strong emission lines of highly ionised nitrogen.

[4] Pismis 24-1SW is apparently a single star with a spectral type of O4 III(f+), indicating a temperature around 40,000 K and emission lines of ionised nitrogen, silicon and helium.

This estimate has decreased as the star was discovered to be a binary, then a triple, and as newer models of stellar atmospheres have been developed.