For those who believe Zacharia Sitchen’s assertions, there is one by the name of Nibiru that has an elliptical orbit of about 3,600 years. While he was a prolific author and did spend a great deal of his life studying cuneiform tablets, his findings remain in dispute by many. For me, I remain open to the idea. Unfortunately, if this planet comes close enough to ours to be observed, it will be long past my time. I have read all of his books and find them entertaining regardless of their veracity. See what Wikipedia has to say.