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The Mass of Dwarf Planet Eris
Guest_AlexBlackwell_*
post Jun 14 2007, 05:10 PM
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In the June 15, 2007, issue of Science there is this Brevia article:

The Mass of Dwarf Planet Eris
Michael E. Brown and Emily L. Schaller
Science 316, 1585 (2007)
Observations of the orbit of dwarf planet Eris' satellite Dysnomia indicates that Eris has a density similar to Pluto's, but is about 1.27 times as large.
Abstract
Supporting Online Material

Unless one has embargo access, the links above will not be accessible for a couple more hours.

You also might want to keep an eye on Mike Brown's and Emily Schaller's web pages. cool.gif

See also:

The Dwarf Planet Known as Eris is More Massive than Pluto, New Data Shows
Caltech Media Relations
June 14, 2007
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Guest_AlexBlackwell_*
post Jun 14 2007, 06:03 PM
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Astronomers Measure Mass of Largest Dwarf Planet
HubbleSite News Release Number: STScI-2007-24
June 14, 2007 01:00 PM (EDT)
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Guest_AlexBlackwell_*
post Jun 14 2007, 06:11 PM
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Dwarf Planet Outweighs Pluto
By Ker Than
Staff Writer, Space.com
posted: 14 June 2007
02:00 pm ET

See also Mike Brown's updated Eris/Dysnomia page.
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ElkGroveDan
post Jun 14 2007, 06:16 PM
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Eris (AKA Xena) and it's moon Dysnomia



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Guest_AlexBlackwell_*
post Jun 14 2007, 06:41 PM
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From The Associated Press:

QUOTE
Pluto Isn't Even Largest Dwarf Planet
By THE ASSOCIATED PRESS
Published: June 14, 2007

Filed at 2:11 p.m. ET

WASHINGTON (AP) -- Pity poor Pluto, the puny former planet is facing yet another indignity. Demoted from planethood a year ago into a new category of dwarf planet, it now turns out that it isn't even the biggest one of those.

''This is sort of Pluto's last stand,'' joked Emily L. Schaller of California Institute of Technology, co-author of a report in Thursday's issue of the journal Science.

When the International Astronomical Union redefined planets last year, it created the new subcategory dwarf planets, and Pluto was thought to be the largest in that group.

Planetary astronomy professor Michael E. Brown and graduate student Schaller found otherwise while studying Dysnomia, the moon of Eris, another dwarf planet.

Using the Keck Observatory and Hubble Space Telescope they were able to calculate the movement of Dysnomia and, with that information, calculate the mass of Eris at 27 percent more than Pluto. But even though Eris tops Pluto, Earth is still 360 times more massive.

''Pluto and Eris are essentially twins -- except that Eris is slightly the pudgier of the two,'' Brown said.

Eris, by the way, is named for the Greek goddess of, among other things, rivalry.
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JRehling
post Jun 14 2007, 07:12 PM
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QUOTE (ElkGroveDan @ Jun 14 2007, 11:16 AM) *
Eris (AKA Xena) and it's moon Dysnomia



Nice result. Only thing to add is, my two cents on the guerrilla campaign to consider Eris, as well as Pluto, as a planet. IAU members may find a banana in their tailpipe or a bag of dog poop burning on their porch.
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volcanopele
post Jun 14 2007, 07:26 PM
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We could always ship the IAU peanuts like Jericho fans did to CBS wink.gif

Very cool results. Also neat is the ability to resolve both Eris and Dysnomia even from 90+ AU away.


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Guest_AlexBlackwell_*
post Jun 14 2007, 07:45 PM
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Wikipedia has a pretty good Eris page.
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volcanopele
post Jun 14 2007, 07:54 PM
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Yeah, after one of the lamest edit wars in Wikipedia history (yeah, I know, it was partly my fault...)


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Guest_AlexBlackwell_*
post Jun 14 2007, 08:10 PM
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Dwarf planet found to be heftier than Pluto
Katharine Sanderson
news@Nature.com
Published online: 14 June 2007; | doi:10.1038/news070611-10
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Jyril
post Jun 14 2007, 09:52 PM
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QUOTE (volcanopele @ Jun 14 2007, 10:54 PM) *
Yeah, after one of the lamest edit wars in Wikipedia history (yeah, I know, it was partly my fault...)


Retrospectively thinking, it is absolutely impossible to imagine any other name for that object. It's just perfect! laugh.gif


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volcanopele
post Jun 14 2007, 09:56 PM
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The war wasn't over the name Eris, it had to do with the origin of the name: whether it was the Greek goddess, or the Discordian godess, or whether they are the same goddess (and if so, which aspect did Brown intend).


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Jyril
post Jun 14 2007, 10:34 PM
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I didn't mean that... It's just that anything about Eris ultimately leads to a fight of some sort. Even before it got the name there was the Xena debacle. I had to revert the article several times because of Xena fans... And no, I won't mention the debate.


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alan
post Jun 15 2007, 02:25 AM
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QUOTE (volcanopele @ Jun 14 2007, 04:56 PM) *
The war wasn't over the name Eris, it had to do with the origin of the name: whether it was the Greek goddess, or the Discordian godess, or whether they are the same goddess (and if so, which aspect did Brown intend).

Discordian Goddess? laugh.gif

In the same spirit I propose (55637) 2002 UX25 be named Flying Spaghetti Monster and its satellite be named Pastafarian. tongue.gif
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David
post Jun 15 2007, 04:20 AM
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The whole thing was just about some Discordians looking for free advertising.
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