Callirrhoe (moon)

Template:Short description Template:Distinguish Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = Callirrhoe | image = {{#invoke:InfoboxImage|InfoboxImage|image=S1999j1.jpg|upright={{#if:||1.1}}|alt=}} | caption = This discovery image of Callirrhoe taken by Spacewatch in October 1999 | headerstyle = {{#if:|background-color:|background-color:#E0CCFF}} | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

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Callirrhoe (Template:IPAc-en; Greek: Καλλιρρόη), also known as Template:Nowrap, is one of Jupiter's outer natural satellites. It is an irregular moon that orbits in a retrograde direction. Callirrhoe was imaged by Spacewatch at Kitt Peak National Observatory from October 6 through November 4, 1999,<ref name=pr/> and originally designated as asteroid Template:Mp.<ref name="moon1999"/><ref>MPS 7418 (Minor Planet Circulars Supplement); not available on-line</ref> It was discovered to be in orbit around Jupiter by Tim Spahr on July 18, 2000, and then given the designation Template:Nowrap.<ref name="IAUC7460 "/><ref>MPEC 2000-Y16: S/1975 J 1 = S/2000 J 1, S/1999 J 1 2000-12-19 (discovery and ephemeris)</ref> It was the 17th confirmed moon of Jupiter.<ref name=pr/>

Name

File:Callirrhoe-eso0025a.jpg

Stack of three images taken by the VLT in July 2000, showing Callirrhoe's movement relative to background stars

It was named in October 2002 after Callirrhoe, daughter of the river god Achelous, one of Zeus's (Jupiter's) many conquests.<ref>IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)</ref>

Characteristics

Callirrhoe has an apparent magnitude of 20.8,<ref name="SheppardMoons"/> making it even fainter than dwarf planet Eris at magnitude 18.7.<ref name=Eris-AstDys>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Jupiter is about 2.1 billion times brighter than Callirrhoe.Template:Efn\approx 2.13\times10^9</math>}}

Callirrhoe is about 9.6 kilometers in diameter,<ref name="Grav2015"/> and orbits Jupiter at an average distance of 24.1 million kilometers in 747.09 days, at an inclination of 141° to the ecliptic (140° to Jupiter's equator) with an eccentricity of 0.28. This object was probably captured long ago from a heliocentric orbit and the Sun's gravitational influence makes this orbit highly erratic.<ref name=pr/>

It belongs to the Pasiphae group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 and 24.1 million kilometers, and with inclinations ranging between 144.5° and 158.3°. However, while Pasiphae belongs to the grey color class (V=17.22 B−V=0.74, V−R=0.38), Callirrhoe falls under the light red color class (V=21.39 B−V=0.72, V−R=0.50), similarly to Megaclite and Sinope.<ref name="Grav2003">Template:Cite journal</ref>

Exploration

File:Callirrhoe - New Horizons.gif

Callirrhoe imaged by the LORRI instrument aboard New Horizons

As a navigation exercise, the New Horizons spacecraft imaged Callirrhoe on January 10, 2007.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

External links

• 17th Moon of Jupiter Discovered Template:Webarchive
• Spacewatch S/1999 J 1
• Spacewatch discovery picture