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283 Emma
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.〔Lutz D. Schmadel, (''Dictionary of Minor Planet Names'', 5th edtn. (2003), Appendix 11, p.40 ).〕
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.〔
==Satellite==
A companion for 283 Emma was detected on 14 July 2003 by W. J. Merline et al. using the Keck II telescope and is designated S/2003 (283) 1. The announcement is contained in the International Astronomical Union Circular (IAUC) 8165.〔(S/2003 (283) 1 (Circular No. 8165) )〕 The satellite orbits at a semi-major axis of about 581 km with an eccenticity of 0.12.〔 Emma has a hill sphere with a radius of about 28,000 km.〔
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