Iocaste (moon)

Template:Short description Template:Distinguish Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = Iocaste | image = {{#invoke:InfoboxImage|InfoboxImage|image=Iocaste-Jewitt-CFHT-annotated.gif|upright={{#if:||1.1}}|alt=}} | caption = Iocaste imaged by the Canada-France-Hawaii Telescope in December 2001 | headerstyle = {{#if:|background-color:|background-color:#E0CCFF}} | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

| header1 = Discovery <ref name="MPEC-2001-A28"/>

| label2 = Discovered by | data2 = Scott S. Sheppard
David C. Jewitt
Yanga R. Fernandez
Eugene A. Magnier | label3 = Discovery site | data3 = Mauna Kea Observatory | label4 = Discovery date | data4 = 23 November 2000 | label5 = Template:Longitem | data5 =

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

| label11 = Template:Longitem | data11 = Jupiter XXIV | label12 = Pronunciation | data12 = Template:IPAc-en | label13 = Template:Longitem | data13 = Ιοκάστη Iokástē or Jocasta | label14 = Template:Longitem | data14 = S/2000 J 3 | label15 = Template:Longitem | data15 = | label16 = Adjectives | data16 = Iocastean Template:IPAc-en<ref>Kin'ya Tsuruta (1996) Shiga Naoya's A Dark Night's Passing, p. 92</ref> | label17 = Symbol | data17 =

| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}} <ref name="MPC127087"/>

| data21 = | data22 = {{#if:17 December 2020 (JD 2459200.5) |Epoch 17 December 2020 (JD 2459200.5)}} | data23 = {{#if: | Uncertainty parameter {{{uncertainty}}}}} | label24 = Observation arc | data24 = 17.39 yr (6,350 days) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = | 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 = 0.3294908 | label35 = Template:Longitem | data35 = –640.97 d | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 289.50565° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 149.42446° (to ecliptic) | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 343.53045° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 110.27239° | label46 = Template:Nowrap | data46 = | label47 = Satellite of | data47 = Jupiter | label48 = Group | data48 = Ananke group | 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

| label61 = Template:Longitem | data61 = {{#if: |{{{p_semimajor}}} AU}} | label62 = Template:Longitem | data62 = | label63 = Template:Longitem | data63 = | label64 = Template:Longitem | data64 = {{#if: |{{{p_mean_motion}}} degTemplate:\yr}} | label65 = Template:Longitem | data65 = {{#if:|{{#expr:360/1 round 5}} yr
({{#expr:365.25*360/1 round 3}} d) }} | label66 = Template:Longitem | data66 = {{#if:|{{{perihelion_rate}}} arcsecTemplate:\yr }} | label67 = Template:Longitem | data67 = {{#if:|{{{node_rate}}} arcsecTemplate:\yr}}

| header70 = Template:Anchor{{#if:| Physical characteristics|Physical characteristics}}<ref name="jpl-phys"/>

| label71 = Dimensions | data71 = | label72 = Template:Longitem | data72 = 5 km | label73 = Template:Longitem | data73 = 1.6 miles (2.6 km) | label74 = Template:Longitem | data74 = | label75 = Template:Longitem | data75 = | label76 = Flattening | data76 = | label77 = Circumference | data77 = | label78 = Template:Longitem | data78 = | label79 = Volume | data79 = | label80 = Mass | data80 = | label81 = Template:Longitem | data81 = | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = | 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: |Template:Longitem |Albedo}} | data93 = 0.04 (assumed) | label94 = Temperature | data94 =

| data100 = {{#if:|

{{#if:|}}{{#if:|}}{{#if:|}}{{#if:|}}

Surface temp.	min	mean	max
{{{temp_name1}}}
{{{temp_name2}}}
{{{temp_name3}}}
{{{temp_name4}}}

}}

| label101 = Surface absorbed dose rate | data101 = | label102 = Surface equivalent dose rate | data102 = | label103 = Template:Longitem | data103 = | label104 = Template:Longitem | data104 = | label105 = Template:Longitem | data105 = 21.8<ref name="SheppardMoons"/> | label106 = Template:Longitem | data106 = 15.5<ref name="MPC127087"/> | label107 = Template:Longitem | data107 =

| header110 = Atmosphere

| label111 = Template:Longitem | data111 = | label112 = Template:Longitem | data112 = | label113 = Composition by volume | data113 =

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

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Iocaste, also known as Template:Nowrap, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii including: David C. Jewitt, Yanga R. Fernandez, and Eugene Magnier led by Scott S. Sheppard in 2000, and given the temporary designation Template:Nowrap.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="MPEC-2001-A28">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Iocaste orbits Jupiter at an average distance of 20.723 million kilometers in 632 earth days, at an inclination of 147° to the ecliptic (146° to Jupiter's equator) with an eccentricity of 0.2874.

It was named in October 2002 after Jocasta,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> the mother/wife of Oedipus in Greek mythology. The name ending in "e" was chosen in accordance with the International Astronomical Union's policy for designating outer moons with retrograde orbits.

Iocaste belongs to the Ananke group, believed to be the remnants of a break-up of a captured heliocentric asteroid.<ref name="SheppardJewitt2003">Sheppard, S. S.; Jewitt, D. C.; "An Abundant Population of Small Irregular Satellites Around Jupiter" Template:Webarchive, Nature, Vol. 423 (May 2003), pp. 261–263</ref><ref name="Nesvorny2003">Nesvorný, D.; Alvarellos, J. L. A.; Dones, L.; and Levison, H. F.; "Orbital and Collisional Evolution of the Irregular Satellites", The Astronomical Journal, Vol. 126 (2003), pp. 398–429 Template:Dead linkTemplate:Cbignore</ref>

The satellite is about 5 kilometres in diameter<ref name="SheppardJewittPorco2004">Sheppard, S. S.; Jewitt, D. C.; Porco, C. C.; "Jupiter's Outer Satellites and Trojans" Template:Webarchive, in Jupiter: The Planet, Satellites and Magnetosphere, edited by Fran Bagenal, Timothy E. Dowling, and William B. McKinnon, Cambridge Planetary Science, Vol. 1, Cambridge, UK: Cambridge University Press, Template:ISBN, 2004, pp. 263–280</ref> and appears grey (colour indices B−V=0.63, R−V=0.36), similar to C-type asteroids.<ref name="Grav2003">Grav, T.; Holman, M. J.; Gladman, B. J.; and Aksnes, K.; "Photometric survey of the irregular satellites", Icarus, Vol. 166 (2003), pp. 33–45</ref>

See also

• Moons of Jupiter
• Praxidike

Further reading

• Ephemeris IAU-MPC NSES
• Mean orbital parameters NASA JPL