Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 52P/Harrington Abell is a periodic comet in our solar system. It was discovered by Robert G. Harrington and George O. Abell in 1955 on plates from the Palomar Sky Survey taken with the 49-inch Samuel Oschin telescope. It has been seen on every apparition since then. With a period of about 7 years, it has been seen close to its perihelia in 1954, 1962, 1969, 1976, 1983, 1991, and 2006. Its orbital period changed from 7.2 to 7.6 years when it passed .04 AU from Jupiter in April, 1974.[ It typically gets no brighter than about magnitude 17.