283 Emma
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| Discovery A | |
|---|---|
| Discoverer | Auguste Charlois |
| Discovery date | February 8, 1889 |
| Alternate designations B |
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| Category | Main belt (Eos) |
| Orbital elements C | |
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| Eccentricity (e) | 0.153 |
| Semi-major axis (a) | 455.219 Gm (3.043 AU) |
| Perihelion (q) | 385.674 Gm (2.578 AU) |
| Aphelion (Q) | 524.763 Gm (3.508 AU) |
| Orbital period (P) | 1938.796 d (5.31 a) |
| Mean orbital speed | 17.07 km/s |
| Inclination (i) | 7.991° |
| Longitude of the ascending node (Ω) |
304.506° |
| Argument of perihelion (ω) |
54.031° |
| Mean anomaly (M) | 67.855° |
| Physical characteristics D | |
| Dimensions | 148.0 km |
| Mass | unknown |
| Density | unknown |
| Surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Spectral class | unknown |
| Absolute magnitude | 8.72 |
| Albedo (geometric) | unknown |
| Mean surface temperature |
unknown |
283 Emma is a large main belt asteroid.
It was discovered by Auguste Charlois on February 8, 1889 in Nice.
A companion for Emma was detected on 14 July 2003 by W. J. Merline et al. using the Keck II telescope. It is 12 km in diameter and is designated S/2003 (283) 1. The announcement is contained in the International Astronomical Union Circular (IAUC) 8165. [1] It probably orbits at a distance of 370 km from the primary. When the orbit is known well enough, the satellite will receive a permanent number and name.
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