283 Emma

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283 Emma
283Emma (Lightcurve Inversion).png
A three-dimensional model of 283 Emma based on its light curve
Discovery
Discovered by Auguste Charlois
Discovery date8 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]

    Contents

    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]

    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. [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]

    References

    1. ↑ "Emma". Dictionary.com Unabridged (Online). n.d.
    2. 1 2 3 4 5 "JPL Small-Body Database Browser: 283 Emma". Solar System Dynamics (2008-10-30 last obs). Retrieved 11 May 2016.
    3. 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.
    4. 1 2 Jim Baer (12 December 2010). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 29 January 2009. Retrieved 17 July 2015.
    5. ↑ Lutz D. Schmadel (2003). Dictionary of Minor Planet Names (5th ed.). Springer Science & Business Media. p. 40. ISBN   978-3-540-00238-3.
    6. ↑ Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", arXiv: 1204.1116 [astro-ph.EP]
    7. ↑ IAUC 8165: S/2003 (283) 1; NOVAE IN M31 (Report). IAU. 27 July 2003.
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