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283 Emma is a large asteroid of the asteroid belt. It was discovered by Auguste Charlois on February 8, 1889, in Nice, France. The reason for its name is unknown.<ref>Lutz D. Schmadel, Dictionary of Minor Planet Names, 5th edtn. (2003), Appendix 11, p.40.</ref>

Measurements made with the IRAS observatory give a diameter of 145.70 ± 5.89 km and a geometric albedo of 0.03 ± 0.01. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 145.44 ± 7.72 km and a geometric albedo of 0.03 ± 0.01. When the asteroid was observed occulting a star, the results showed a diameter of 148.00 ± 16.26 km.<ref name="2012arXiv1204" />


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