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POPSC/2007 N3 鹿林慧星 (Lulin) Relative to other Oort cloud comets, it is considered very close to the perigee of the Earth, only about 0.41 astronomical units (equivalent to 610,000 kilometers), making the astronomical experts, a lot of day and night guarding it, and also captured a rare tail comet breakthrough long tail and so the reverse scenario.