283 Emma
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A three-dimensional model of 283 Emma based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 8 February 1889 |
| Designations | |
| Main belt (Eos) | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 122.26 yr (44655 d) |
| Aphelion | 3.49701 AU (523.145 Gm) |
| Perihelion | 2.59675 AU (388.468 Gm) |
| 3.04688 AU (455.807 Gm) | |
| Eccentricity | 0.14773 |
| 5.32 yr (1942.6 d) | |
|
Average orbital speed
|
17.07 km/s |
| 127.107° | |
| 0° 11m 7.148s / day | |
| Inclination | 7.99162° |
| 304.369° | |
| 53.7020° | |
| Known satellites | 1 (9±5 km) |
| Earth MOID | 1.601 AU (239.5 Gm) |
| Jupiter MOID | 1.97626 AU (295.644 Gm) |
| Jupiter Tisserand parameter | 3.207 |
| Physical characteristics | |
| Dimensions |
148.06±4.6 km (IRAS) 160±10 km (AO) |
| Mass | 1.38×1018 kg |
|
Mean density
|
0.81±0.08 g/cm³ |
|
Equatorial surface gravity
|
unknown |
|
Equatorial escape velocity
|
unknown |
| 6.896 h (0.2873 d) | |
| 0.0262±0.002 (Dark) | |
| Temperature | unknown |
| unknown | |
| 8.72 | |
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.
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.
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. 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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