57 Mnemosyne

57 Mnemosyne
Discovery
Discovered by	Karl Theodor Robert Luther
Discovery date	22 September 1859
Designations
MPC designation	(57) Mnemosyne
Pronunciation	/nɪˈmɒsɪniː/[1]
Named after	Mnemosyne
Minor planet category	Main belt
Adjectives	Mnemosynean /ˌnɛməsɪˈniːən/, Mnemosynian /nɛməˈsɪniən/
Orbital characteristics
	Epoch December 31, 2006 (JD 2454100.5)
Aphelion	526.785 Gm (3.521 AU)
Perihelion	415.379 Gm (2.777 AU)
Semi-major axis	471.082 Gm (3.149 AU)
Eccentricity	0.118
Orbital period	2041.056 d (5.59 a)
Mean anomaly	68.001°
Inclination	15.200°
Longitude of ascending node	199.337°
Argument of perihelion	212.848°
Physical characteristics
Dimensions	113.01±4.46 km[2]
Mass	(1.26±0.24)×1019 kg[2]
Mean density	16.62±3.73 g/cm3[2]
Rotation period	12.06±0.03 h[3]
Geometric albedo	0.215[4]
Spectral type	S
Absolute magnitude (H)	7.03

Mnemosyne (minor planet designation: 57 Mnemosyne) 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.[5] 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.[6][7]

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.[3] It has an estimated span of 113.01±4.46 km and a mass of (1.26±0.24)×10¹⁹ kg.[2]

References

Noah Webster (1884) A Practical Dictionary of the English Language
Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
Ditteon, Richard; Hawkins, Scot (September 2007), "Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006", The Minor Planet Bulletin, 34 (3): 59–64, Bibcode:2007MPBu...34...59D.
Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 20. ISBN 978-3-540-00238-3.
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.
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.

External links

57 Mnemosyne at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
57 Mnemosyne at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] Noah Webster (1884) A Practical Dictionary of the English Language

[Carry2012-2] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[Ditteon2007-3] Ditteon, Richard; Hawkins, Scot (September 2007), "Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006", The Minor Planet Bulletin, 34 (3): 59–64, Bibcode:2007MPBu...34...59D.

[4] Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine

[5] Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 20. ISBN 978-3-540-00238-3.

[Hill1873-6] 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.

[Strand1970-7] 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.