Astronomy:283 Emma

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Short description: Main-belt asteroid
283 Emma
283Emma (Lightcurve Inversion).png
A three-dimensional model of 283 Emma based on its light curve
Discovery
Discovered byAuguste Charlois
Discovery date8 February 1889
Designations
(283) Emma
Pronunciation/ˈɛmə/[1]
A889 CA, 1980 FJ12
Minor planet categoryMain belt (Emma)
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc122.26 yr (44655 d)
|{{{apsis}}}|helion}}3.49701 astronomical unit|AU (523.145 Gm)
|{{{apsis}}}|helion}}2.59675 AU (388.468 Gm)
3.04688 AU (455.807 Gm)
Eccentricity0.14773
Orbital period5.32 yr (1942.6 d)
Average Orbital speed17.07 km/s
Mean anomaly127.107°
Mean motion0° 11m 7.148s / day
Inclination7.99162°
Longitude of ascending node304.369°
53.7020°
Known satellites1 (9±5 km)[2]
Physical characteristics
Dimensions148.06±4.6 km (IRAS)[3]
160±10 km (AO)[2]
Mean density0.81±0.08 g/cm3[4]
Rotation period6.896 h (0.2873 d)[3]
Geometric albedo0.0262±0.002[3] (Dark)
Absolute magnitude (H)8.72[3]


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]

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.[7] The satellite orbits at a semi-major axis of about 581 km with an eccentricity of 0.12.[2] Emma has a Hill sphere with a radius of about 28,000 km.[2]

References

  1. "Emma". Dictionary.com Unabridged. Random House. https://www.dictionary.com/browse/Emma. 
  2. 2.0 2.1 2.2 2.3 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. doi:10.1016/j.icarus.2007.12.010. Bibcode2008Icar..195..295M. 
  3. 3.0 3.1 3.2 3.3 3.4 "JPL Small-Body Database Browser: 283 Emma". https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=283. Retrieved 11 May 2016. 
  4. Cite error: Invalid <ref> tag; no text was provided for refs named Baer
  5. Lutz D. Schmadel (2003). Dictionary of Minor Planet Names (5th ed.). Springer Science & Business Media. p. 40. ISBN 978-3-540-00238-3. https://books.google.com/books?id=KWrB1jPCa8AC. 
  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. S/2003 (283) 1 (Circular No. 8165)

External links