6344 P–L is a small Solar System body which was discovered in 1960 by asteroid searchers Tom Gehrels, Ingrid van Houten-Groeneveld, and Cornelis Johannes van Houten. Last seen in 1960, it was thought to be missing but then later rediscovered in 2007 as 2007 RR9 (also written 2007 RR9). In other words, it was a lost asteroid from 1960 until it was recovered in 2007. P–L stands for Palomar–Leiden, for Palomar Observatory and Leiden Observatory.
It is either an asteroid or dormant comet nucleus, and it has a 4.7 year orbit around the Sun. The orbit goes out as far as Jupiter's but then back in, passing as close as 0.07 AU to the Earth, making it a collision risk.
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