What is that other, faint object in the image?
There’s lots of little specks in the images, most of them are “static” caused by cosmic rays — similar to the static on your t.v. Sometimes they line up and look a lot like a moving object. So basically, we ignore anything that is only one or two pixels in size — it really has to look a lot like a star, being several pixels across and “round” looking. Also, it has to move in a straight line and be present on all the images. You can probably find a lot of these things in the discovery images that it don’t fit all the criteria of a real object. Also, it’s true that we may miss some very faint objects. But we are interested in finding the brightest ones, so in the interest in saving time, because there are only a couple of us working on this project and there is a lot of data, some of the faintest objects may be real, and we may not recognize them in the images. But we consider that “acceptable loss” because we are looking for the biggest, brightest things anyway. People in the future
