57 Mnemosyne

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| header1 = Discovery

| header10 = {{#if:|Designations|Designations}}

| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}

| data21 = | data22 = {{#if:December 31, 2006 (JD 2454100.5) |Epoch December 31, 2006 (JD 2454100.5)}} | data23 = {{#if: | Uncertainty parameter {{{uncertainty}}}}} | label24 = Observation arc | data24 = | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = Template:Cvt | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = Template:Cvt | label28 = Peri{{#if:|{{{apsis}}}|apsis}} | data28 = | label29 = {{#switch:{{{apsis}}} |helion|astron=Ap{{{apsis}}} |Apo{{#if:|{{{apsis}}}|apsis}}}} | data29 = | label30 = Periastron | data30 = | label31 = Apoastron | data31 = | label32 = Template:Longitem | data32 = Template:Cvt | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.118 | label35 = Template:Longitem | data35 = Template:Cvt | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 68.001° | label39 = Template:Longitem | data39 = | label40 = Inclination | data40 = 15.200° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 199.337° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 212.848° | label46 = Template:Nowrap | data46 = | label47 = Satellite of | data47 = | label48 = Group | data48 = | label49 = {{#switch: |yes|true=Satellites |Known satellites}} | data49 = | label50 = Star | data50 = | label51 = Earth MOID | data51 = | label52 = Mercury MOID | data52 = | label53 = Venus MOID | data53 = | label54 = Mars MOID | data54 = | label55 = Jupiter MOID | data55 = | label56 = Saturn MOID | data56 = | label57 = Uranus MOID | data57 = | label58 = Neptune MOID | data58 = | label59 = T_Jupiter | data59 =

| header60 = Proper orbital elements

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({{#expr:365.25*360/1 round 3}} d) }} | label66 = Template:Longitem | data66 = {{#if:|{{{perihelion_rate}}} arcsec Template:\yr }} | label67 = Template:Longitem | data67 = {{#if:|{{{node_rate}}} arcsec Template:\yr}}

| header70 = Template:Anchor{{#if:yes| Physical characteristics|Physical characteristics}}

| label71 = Dimensions | data71 = Template:Val<ref name="Carry2012"/> | label72 = Template:Longitem | data72 = | label73 = Template:Longitem | data73 = | label74 = Template:Longitem | data74 = | label75 = Template:Longitem | data75 = | label76 = Flattening | data76 = | label77 = Circumference | data77 = | label78 = Template:Longitem | data78 = | label79 = Volume | data79 = | label80 = Mass | data80 = Template:Val<ref name="Carry2012"/> | label81 = Template:Longitem | data81 = Template:Val<ref name="Carry2012"/> | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = Template:Val<ref name=Pilcher_2019/> | label86 = Template:Longitem | data86 = | label87 = Template:Longitem | data87 = | label88 = Template:Longitem | data88 = | label89 = Template:Longitem | data89 = | label90 = Template:Longitem | data90 = | label91 = Template:Longitem | data91 = | label92 = Template:Longitem | data92 = | label93 = {{#if:yes |Template:Longitem |Albedo}} | data93 = 0.215<ref>Asteroid Data Sets Template:Webarchive</ref> | label94 = Temperature | data94 =

| data100 = {{#if:|

Surface temp.	min	mean	max
{{{temp_name1}}}
{{{temp_name2}}}
{{{temp_name3}}}
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| header110 = Atmosphere

| below = {{#if:||Template:Reflist }}

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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.<ref>Template:Cite book</ref>

This asteroid is orbiting in the outer main belt at a distance of Template:Cvt from the Sun with an eccentricity (ovalness) of 0.118 and a period of Template:Cvt. 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.<ref name=Hill1873/><ref name=Strand1970/>

Photometry measurements made at the Oakley Observatory during 2006 produced a lightcurve with a rotation period of Template:Val and an amplitude of Template:Val in magnitude.<ref name=Ditteon2007/> Subsequent observations at Organ Mesa Observatory in 2019 showed this period was not a good fit to a longer light curve. A period of Template:Val was adopted; roughly double the original period.<ref name=Pilcher_2019/> It has an estimated span of Template:Val and a mass of Template:Val.<ref name="Carry2012"/>

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57 Mnemosyne

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