Discovery | |
---|---|
Discovered by | Auguste Charlois |
Discovery date | 8 February 1889 |
Designations | |
(283) Emma | |
Pronunciation | /ˈɛmə/ [1] |
A889 CA, 1980 FJ12 | |
Main belt ( Emma) | |
Orbital characteristics [2] | |
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) [3] |
Physical characteristics | |
Dimensions | 148.06±4.6
km (
IRAS)
[2] 160±10 km ( AO) [3] |
Mass | 1.38×1018 kg [4] |
Mean
density | 0.81±0.08 g/cm3 [4] |
6.896 h (0.2873 d) [2] | |
0.0262±0.002 [2] (Dark) | |
8.72 [2] | |
283 Emma is a large asteroid of the asteroid belt and the namesake of the Emma family. It was discovered by Auguste Charlois on 8 February 1889, in Nice, France. The reason for its name is unknown. [5]
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. [6]
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. [7] The satellite orbits at a semi-major axis of about 581 km with an eccentricity of 0.12. [3] Emma has a Hill sphere with a radius of about 28,000 km. [3]
Discovery | |
---|---|
Discovered by | Auguste Charlois |
Discovery date | 8 February 1889 |
Designations | |
(283) Emma | |
Pronunciation | /ˈɛmə/ [1] |
A889 CA, 1980 FJ12 | |
Main belt ( Emma) | |
Orbital characteristics [2] | |
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) [3] |
Physical characteristics | |
Dimensions | 148.06±4.6
km (
IRAS)
[2] 160±10 km ( AO) [3] |
Mass | 1.38×1018 kg [4] |
Mean
density | 0.81±0.08 g/cm3 [4] |
6.896 h (0.2873 d) [2] | |
0.0262±0.002 [2] (Dark) | |
8.72 [2] | |
283 Emma is a large asteroid of the asteroid belt and the namesake of the Emma family. It was discovered by Auguste Charlois on 8 February 1889, in Nice, France. The reason for its name is unknown. [5]
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. [6]
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. [7] The satellite orbits at a semi-major axis of about 581 km with an eccentricity of 0.12. [3] Emma has a Hill sphere with a radius of about 28,000 km. [3]