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283 Emma
Main-belt asteroid
Main-belt asteroid
| Field | Value |
|---|---|
| minorplanet | yes |
| background | #D6D6D6 |
| name | 283 Emma |
| image | 283 Emma.png |
| image_scale | Lightcurve-base 3D-model of Emma on the top with an image of the asteroid on the bottom. |
| caption | A three-dimensional model of 283 Emma based on its light curve |
| discoverer | Auguste Charlois |
| discovered | 8 February 1889 |
| mpc_name | (283) Emma |
| alt_names | A889 CA, |
| pronounced | |
| mp_category | Main belt (Emma) |
| epoch | 31 July 2016 (JD 2457600.5) |
| semimajor | 3.04688 AU |
| perihelion | 2.59675 AU |
| aphelion | 3.49701 AU |
| eccentricity | 0.14773 |
| period | 5.32 yr (1942.6 d) |
| inclination | 7.99162° |
| asc_node | 304.369° |
| arg_peri | 53.7020° |
| mean_anomaly | 127.107° |
| avg_speed | 17.07 km/s |
| satellites | 1 () |
| dimensions | (IRAS) |
| 160±10 km (AO) | |
| mass | 1.38 kg |
| density | |
| rotation | 6.896 h |
| abs_magnitude | 8.72 |
| albedo | (Dark) |
| mean_motion | / day |
| orbit_ref | |
| observation_arc | 122.26 yr (44655 d) |
| uncertainty | 0 |
160±10 km (AO)
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.
Measurements made with the IRAS observatory give a diameter of and a geometric albedo of . By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of and a geometric albedo of . When the asteroid was observed occulting a star, the results showed a diameter of .
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 discovery was reported in the International Astronomical Union Circular (IAUC) 8165. The satellite orbits at a semi-major axis of about 581 km with an eccentricity of 0.12. Emma has a Hill sphere with a radius of about 28,000 km.
References
| display-authors = 1
References
- {{dict.com. Emma
- Jim Baer. (2010-12-12). "Recent Asteroid Mass Determinations". Personal Website.
- Lutz D. Schmadel. (2003). "Dictionary of Minor Planet Names". Springer Science & Business Media.
- (27 July 2003). "IAUC 8165: S/2003 (283) 1; NOVAE IN M31". IAU.
This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.
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