Astronomy Picture of the Day - Eris

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	Astronomy Picture of the Day - Eris

tfarrow

6-19-2007 8:33 PM

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astronomy, planets, eris, solar system

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/fadc0895-3b7e-48f7-9bdb-3f1413f4b2c9/CD25E8A2-8562-4F38-A584-DE6B82B74DC8/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://antwrp.gsfc.nasa.gov/apod/ap070619.html" href="http://antwrp.gsfc.nasa.gov/apod/ap070619.html" style="font-size: 11px;">antwrp.gsfc.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/ap070619.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/ADD65508-1C07-4B84-B446-869B0F89F410" alt="See Explanation.  Clicking on the picture will download
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<B> Eris: More Massive than Pluto </B> 
<B> Credit & Copyright: </B>
<A href="http://photo.net/photodb/user?user_id=761143">Thierry Lombry</A>
</CENTER></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/ap070619.html"><P>
<B> Explanation: </B>
<A href="http://en.wikipedia.org/wiki/Eris_%28dwarf_planet%29 ">Eris</A>, a 
<A href="http://en.wikipedia.org/wiki/Dwarf_planet">dwarf planet</A> 
currently orbiting the Sun at about twice Pluto's distance, 
<A href="http://hubblesite.org/newscenter/archive/releases/2007/24">has
been measured</A> 
to have about 27 percent more mass than Pluto.  
The mass was calculated by timing the orbit of Eris' moon 
<A href="http://en.wikipedia.org/wiki/Dysnomia_(moon)">Dysnomia</A>.  
Images taken with a ground-based 
<A href="http://antwrp.gsfc.nasa.gov/apod/ap971227.html">Keck telescope</A>,
when combined with existing images taken by 
<A href="http://antwrp.gsfc.nasa.gov/apod/ap010806.html">Hubble Space Telescope</A>,
show that Dysnomia has a nearly circular orbit lasting about 16 days.  
Cataloged as 2003 UB313 only a year ago, 
<A href="http://science.hq.nasa.gov/kids/imagers/ems/infrared.html">infrared images</A> also showed previously that Eris is actually
larger in diameter than <A href="http://antwrp.gsfc.nasa.gov/apod/ap060903.html">Pluto</A>.  
The plane of Eris' orbit is well out of the plane of the 
<A href="http://nineplanets.org/overview.html">Solar System</A>'s planets.  
In the above drawing, a scientific artist has imagined Eris and Dysnomia orbiting our distant Sun. 
No space missions are currently planned to Eris, although the robotic 
<A href="http://en.wikipedia.org/wiki/New_Horizons">New Horizons</A> spacecraft bound for 
<A href="http://pluto.jhuapl.edu/overview/faqs.php">Pluto</A> has recently  
<A href="http://antwrp.gsfc.nasa.gov/apod/ap070307.html">passed Jupiter</A>.  
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