283 Emma

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283 Emma
Discovery A
Discoverer Auguste Charlois
Discovery date February 8, 1889
Alternate
designations
B
Category Main belt (Eos)
Orbital elements C
Epoch 30 January 2005 (JD 2453400.5)
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
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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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