Very green object

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If you click on the map, a little menu should pop up with a link called “Single Image Cutouts”, which shows all the exposures that went into the color image there;

In this case, if you scroll through them you’ll see nothing in most of the images, except one,
CCD r 636035 S25
where there is a bright thing in the middle.

It looks about as blurry as the nearby stars, so that means it is probably a real object, not some artifact in the camera or cosmic ray. Next to each of the image cutouts there is a link to look up that place and time in the JPL Horizons system, which tracks asteroids and other moving objects. In this case, it looks like this is the asteroid called “10386 Romulus”.