283 Emma
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283 Emma
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Discovery
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| Discovered by | Auguste Charlois |
| Discovery date | February 8, 1889 |
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Designations
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| Minor planet category |
Main belt (Eos) |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 524.763 Gm (3.508 AU) |
| Perihelion | 385.674 Gm (2.578 AU) |
| Semi-major axis | 455.219 Gm (3.043 AU) |
| Eccentricity | 0.153 |
| Orbital period | 1938.796 d (5.31 a) |
| Average orbital speed | 17.07 km/s |
| Mean anomaly | 67.855° |
| Inclination | 7.991° |
| Longitude of ascending node | 304.506° |
| Argument of perihelion | 54.031° |
| Satellites | 1 (9±5 km)[1] |
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Physical characteristics
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| Dimensions | 148±5 km (IRAS)[2] 160±10 km (AO)[1] |
| Mass | 1.3×1018 kg[3] |
| Mean density | 0.81±0.08 g/cm³[3] |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 6.888 h[2] |
| Albedo | 0.0262[2] (Dark) |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 8.72[2] |
283 Emma is a large main-belt asteroid. It was discovered by Auguste Charlois on February 8, 1889, in Nice. The reason for its name is unknown.[4]
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 announcement is contained in the International Astronomical Union Circular (IAUC) 8165.[5] The satellite orbits at a semi-major axis of about 581 km with an eccenticity of 0.12.[1] Emma has a hill sphere with a radius of about 28,000 km.[1]
References
- ^ a b c d Marchis, Franck; P. Descamps, J. Berthier, D. hestroffer, F. vachier, M. Baek, A. Harris, D. Nesvorny (2008). "Main Belt Binary Asteroidal Systems With Eccentric Mutual Orbits". Icarus 195 (1): 295–316. arXiv:0804.1385. Bibcode 2008Icar..195..295M. doi:10.1016/j.icarus.2007.12.010.
- ^ a b c d "JPL Small-Body Database Browser: 283 Emma". 2008-10-30 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=283. Retrieved 2008-11-27.
- ^ a b Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. http://home.earthlink.net/~jimbaer1/astmass.txt. Retrieved 2008-11-27.
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, 5th edtn. (2003), Appendix 11, p.40.
- ^ S/2003 (283) 1 (Circular No. 8165)
External links
- Orbital simulation from JPL (Java) / Ephemeris
- Orbits of Binary Asteroids with Adaptive Optics (VLT images)
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