283 Emma
 Images of 283 Emma by telescope on the top with a three-dimensional model of the asteroid based on its lightcurve below | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 8 February 1889 |
| Designations | |
| Pronunciation | /ˈɛmə/ |
| A889 CA, 1980 FJ12 | |
| Main belt (Emma) | |
| 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) |
| Physical characteristics | |
| 142 ± 14 km (AO) | |
| Mass | (1.398±0.001)×1018 kg |
Mean density | 0.9±0.3 g/cm3 |
| 6.89523 h (0.287301 d) | |
Pole ecliptic longitude | 256° ± 3° |
Pole ecliptic latitude | 23° ± 3° |
| 0.0262±0.002 (Dark) | |
| P | |
| 8.72 | |
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 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.
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
- ↑ "Emma". Dictionary.com Unabridged (Online). n.d.
- 1 2 3 "JPL Small-Body Database Browser: 283 Emma". Solar System Dynamics (2008-10-30 last obs). Retrieved 11 May 2016.
- 1 2 3 4 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. S2CID 119244052.
- 1 2 3 4 5 Viikinkoski, M.; Hanuš, J.; Kaasalainen, M.; Marchis, F.; Ďurech, J. (November 2017). "Adaptive optics and lightcurve data of asteroids: twenty shape models and information content analysis". Astronomy & Astrophysics. 607: A117. arXiv:1708.05191. Bibcode:2017A&A...607A.117V. doi:10.1051/0004-6361/201731456. ISSN 0004-6361. S2CID 67813915.
- 1 2 Minker, K.; Carry, B.; Vachier, F.; Marsset, M.; Ďurech, J.; Hanuš, J.; Liberato, L.; Merline, W. J.; Margot, J. L.; Dumas, C.; Close, L. M.; Conrad, A.; Grundy, W. M.; Behrend, R.; Roy, R.; et al. (September 2025). "A dynamical dichotomy in large binary asteroids". Astronomy & Astrophysics. 701: A42. arXiv:2507.13072. Bibcode:2025A&A...701A..42M. doi:10.1051/0004-6361/202554973. ISSN 0004-6361. S2CID 280282952.
- ↑ Lutz D. Schmadel (2003). Dictionary of Minor Planet Names (5th ed.). Springer Science & Business Media. p. 40. ISBN 978-3-540-00238-3.
- ↑ Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", arXiv:1204.1116 [astro-ph.EP]
- ↑ IAUC 8165: S/2003 (283) 1; NOVAE IN M31 (Report). IAU. 27 July 2003.
External links
- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- Orbits of Binary Asteroids with Adaptive Optics (VLT images)
- 283 Emma at AstDyS-2, Asteroids—Dynamic Site
- 283 Emma at the JPL Small-Body Database
