Astronomy:57 Mnemosyne
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | 22 September 1859 |
| Designations | |
| (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) | |
| |{{{apsis}}}|helion}} | 526.785 Gm (3.521 astronomical unit|AU) |
| |{{{apsis}}}|helion}} | 415.379 Gm (2.777 AU) |
| 471.082 Gm (3.149 AU) | |
| Eccentricity | 0.118 |
| Orbital period | 2,041.056 d (5.59 a) |
| Mean anomaly | 68.001° |
| Inclination | 15.200° |
| Longitude of ascending node | 199.337° |
| 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 | 25.324±0.002 h[3] |
| Geometric albedo | 0.215[4] |
| S | |
| Absolute magnitude (H) | 7.03 |
Mnemosyne (minor planet designation: 57 Mnemosyne) is a large main belt asteroid. It is a stony S-type asteroid in composition. This object was discovered by Robert Luther on 22 September 1859 in Düsseldorf. Its name was chosen by Martin Hoek, the director of the Utrecht Observatory, in reference to Mnemosyne, a Titaness in Greek mythology.[5]
This asteroid is orbiting in the outer main belt at a distance of 3.149 astronomical unit|AU from the Sun with an eccentricity (ovalness) of 0.118 and a period of 5.58811 a. The orbital plane is inclined at an angle of 15.2° to the ecliptic. 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.[8] Subsequent observations at Organ Mesa Observatory in 2019 showed this period was not a good fit to a longer light curve. A period of 25.324±0.002 h was adopted; roughly double the original period.[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
- ↑ 2.0 2.1 2.2 2.3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: pp. 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ 3.0 3.1 Pilcher, Frederick (October 2019), "New Lightcurves of 50 Virginia, 57 Mnemosyne, 59 Elpis 194 Prokne, 444 Gyptis, and 997 Priska", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 46 (4): 445–448, Bibcode: 2019MPBu...46..445P.
- ↑ Asteroid Data Sets
- ↑ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 20. ISBN 978-3-540-00238-3. https://books.google.com/books?id=KWrB1jPCa8AC&pg=PA20.
- ↑ 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.
- ↑ 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.
- ↑ 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.
External links
- 57 Mnemosyne at AstDyS-2, Asteroids—Dynamic Site
- 57 Mnemosyne at the JPL Small-Body Database
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