57 Mnemosyne

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57 Mnemosyne
Discovered by Karl Theodor Robert Luther
Discovery date 22 September 1859
MPC designation (57) Mnemosyne
Named after
Main belt
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 526.785 Gm (3.521 AU)
Perihelion 415.379 Gm (2.777 AU)
471.082 Gm (3.149 AU)
Eccentricity 0.118
2041.056 d (5.59 a)
Inclination 15.200°
Physical characteristics
Dimensions 113.01±4.46 km[1]
Mass (1.26±0.24)×1019 kg[1]
Mean density
16.62±3.73 g/cm3[1]
12.06±0.03 h[2]

57 Mnemosyne (/nɪˈmɒsɪn/ ni-MOS-i-nee) is a large main belt asteroid. It is an S-type asteroid in composition, it was discovered by Robert Luther on 22 September 1859 from Düsseldorf. Its name was chosen by Martin Hoek, director of the Utrecht Observatory, in reference to Mnemosyne, a Titaness in Greek mythology.[4] The orbital period of this asteroid is close to a 2:1 commensurability with Jupiter, which made it useful for perturbation measurements to derive the mass of the planet.[5][6]

Photometry measurements made at the Oakley Observatory during 2006 produced a lightcurve with a rotation period of 12.06±0.03 h and an amplitude of 0.14±0.01 in magnitude.[2] It has an estimated span of 113.01±4.46 km and a mass of (1.26±0.24)×1019 kg.[1]


  1. ^ a b c d Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336Freely accessible, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  2. ^ a b Ditteon, Richard; Hawkins, Scot (September 2007), "Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006", The Minor Planet Bulletin (ISSN 1052-8091). Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 34 (3): 59−64, Bibcode:2007MPBu...34...59D. 
  3. ^ Asteroid Data Sets Archived 2010-01-17 at WebCite
  4. ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.20.
  5. ^ Hill, G. W. (1873), "On the Derivation of the Mass of Jupiter from the Motion of Certain Asteroids", Memoirs of the American Academy of Arts and Sciences, 9 (2): 417−420, JSTOR 25058008. 
  6. ^ Strand, K. A. (January 1970), "U.S. Naval Observatory, Washington, D.C. Report 1968-1969.", Bulletin of the Astronomical Society, 2: 144−149, Bibcode:1970BAAS....2..144S. 

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