The stars of the Trapezium make up the Theta¹ Ori system, with Theta¹ Ori as the primary. There is some confusion regarding the component identifications, as they have been often lettered in RA order instead of the traditional magnitude order used for multiple stars (used here).

The four brightest members are visible in even the smallest telescope using high magnification.

Star B is the variable star V1016 Ori, an Algol-type eclipsing binary system that becomes fainter by about a magnitude when the smaller, brighter star passes in front of the larger, cooler one. Note that no telescope can split these two stars apart. Eclipses occur every 65 days.

Star D is also an eclipsing binary, known as BM Ori. It undergoes a primary eclipse every 6.5 days.

Star C is V361 Ori, an irregular, eruptive variable of the Orion type which varies by about 0.1 magnitude.

Stars H and I should be visible in a 6" scope under good conditions. The K-L pair is quite difficult, typically requiring very large aperture and good seeing.

Eyepiece view in six inch at 50x. North is down and east is to the right.