Because the nebula hide the faint stars in this area. You can use an infrared catalog to look behind the nebula. See this example using 2MASS as a VO catalog:pchevalley
I am guessing this is because most non-visual star catalogues have trouble with the sky background (among other things to do with the way the ISM scrambles
Even though star to magnitude ~12.5 show up it appears the area surrounding Theta Ori (in M42) never show anything beyond mag 10.5. I know there are stars ofmarty_0750
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