One of the obstacles to analyzing Kepler light curves is ruling out light contamination in the target star from background stars. Background eclipsing binary stars (BG EBs) are a real problem. KID 5217733 is a detached eclipsing binary star system with a magnitude of 7.4. This is a very bright star and as Kian Jek says, is a "Super Contaminator" affecting many nearby stars in the area.
Read more on this star on the Talk thread here.
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