(Astronomy)
The Trapezium, or Theta Orionis, is probably
the best known multiple star in the sky. It
can be observed even with a small telescope.
It can be found inside M42, the Orion Nebula.
It (unsurprisingly) resembes a small Trapeze:
f
h C
.·' '·.
.·' '·.
.·' '·.
.·' g .:D
A; ..·''
'. ..·''
e ''. ,.·'
'B
The stars A - D are the most luminous ones, C
being the brightest in the group with a visual
magnitude of 5.4, followed by D, with mag 6.3,
then A at 6.8 and B, actually a binary star, at 6.5.
With a larger telescope one should be able to make out the
neighboring stars (e - h) as well, although their
magnitudes start at 11. (The stars e and f are often
used by amateur astronomers to judge the quality
of their telescopes.)