(85640) 1998 OX4 also written 1998 OX4 is an Apollo asteroid and a Mars crosser.It was discovered on July 26 1998 by the Spacewatch program and subsequently lost. It was re-discovered by the Near-Earth Asteroid Tracking (NEAT) project on August 31 2002 as 2002 PJ34. It was removed from the Sentry Risk Table on 8 August 2002. It has a well determined orbit with an observation arc of more than 10 years.
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