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1009 Sirene is a Mars-crosser asteroid. It was discovered by Karl Wilhelm Reinmuth on October 31, 1923, and observed for 4 months.<ref name="MPC" /> Its provisional designation was 1923 PE and it was named after the mythological Sirens. It became a lost asteroid until it was recovered in 1982 from exposures on the 48-inch (120 cm) Schmidt at Palomar Observatory.<ref>{{#invoke:citation/CS1|citation |CitationClass=citation }}</ref>

Sirene's semi-major axis is 2.62 AU, well beyond that of Mars, but its highly eccentric orbit crosses Mars', allowing close approaches of the planet. On 8 June 1949 the asteroid passed {{safesubst:#invoke:convert|convert}} from Mars. With an absolute magnitude of 13.9,<ref name="jpldata" /> the asteroid is about 5–10 km in diameter.<ref name="h" />


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