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Talk:Dwarf planet

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early FA. The History of the Concept section is mostly based on 2006/2008 sources, many of which are news or magazine articles rather than higher quality sources which are certainly available. Updates since then are restricted to a brief couple of sentences, which seems insufficient (and is partially sourced to twitter). The Exploration section is paltry, it is where I would expect to find for example an explanation of the reasoning that led to the sentence "Ceres is close to equilibrium, but some gravitational anomalies remain unexplained", which is cited to a Dawn paper. The overall structure of the article has some oddities, why is "Contention regarding the reclassification of Pluto" a separate section so far away from the History of the concept section? The pie charts are causing some image sandwiching, and seem a really odd way to present that data. The source formatting needs some tightening: there's a bare url, and others lack page numbers and access-dates. Others may find more missing areas, it does feel an oddly short article for the scope involved.
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something like that was discovered, and that he didn't care if people widened the definition of "planet", but also said that he thought it was important to make it really clear that there's a difference between dominant and non-dominant objects and that a Mars-sized inner Oort cloud object would not be dominant. I agree wholeheartedly with his position. :D
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from about 62 minutes onwards. He thought then that some of the largest inner Oort cloud objects (Sedna's population) would be Mercury- or Mars-sized, though he used a power-law argument and based it on a size of Sedna that we now know to be too big. He thought that the debate would reopen again when
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The "Contention regarding the reclassification of Pluto" isn't even there and aside from a couple of oblique mentions there is no discussion over the controversy regarding the definition of "dwarf planet" and or issues with the definition used, a continuing issue (note the last paragraph of the first
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Doubt it. That's not their job, and if they did, they'd be engaging in pseudoscience. There might be some announcement in the future that refers to one or another of those bodies as DPs, but highly doubtful that they'll try to substitute science with their authority by making an official declaration
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So maybe the best answer to the OP's questions is: "The current definition of a dwarf planet focuses only on dominance. Consequently there is no upper size limit, and if we take it by the letter, Jupiter would be a dwarf planet if it were orbiting in the outer Oort cloud. However, we agree with Mike
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Actually, I think Zach may be right. They are supposed to be small. But the IAU rejected a size limit to define planets (e.g. "Pluto or larger") as arbitrary, so they needed some other way to say the same thing that looked more scientific. They chose orbital dominance. But I wonder how important the
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Unexpected ring discovered around dwarf planet Quaoar. A kind of revolution has recently appeared in the field: another Kuiper belt object, Quaoar, hosts also a dense arc embedded in a continuous thinner ring, but that system lies outside Quaoar’s Roche lobe and thus should theoretically not exist.
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The definition was created for the bodies we know about. There's an obvious division between the giant planets and the terrestrials, but Venus and Mars have to be planets, so the IAU couldn't draw the line there. The next obvious division is between the terrestrials and Eris/Pluto/Ceres, and that's
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Sure. A Jupiter-sized object in the outer Oort cloud would be a dwarf planet. On the other hand, a Pluto-mass object in Mercury's orbit would be a full-fledged planet. (I say Pluto-mass because Pluto itself in Mercury's orbit would turn into the most spectacular comet ever seen.) The upper limit is
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The next obvious place to draw a line is between planemos and SSSB's, and that was the competing definition of "planet" that was considered by the IAU. And the one that's used by people like Stern and Grundy. But in practice that's a very difficult definition to apply, because we just don't have
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what the IAU chose and what their definition is meant to enshrine. They could've just said "the big eight", but that wouldn't sound very scientific. It's doubtful the IAU definition will work well for other planetary systems, though, and it doesn't work for the early history of even our system.
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This is an old FA promotion, and does not seem to have kept up over the succeeding decade. There are a couple of unsourced paragraphs and other unsourced text, and the prose in many areas has short paragraphs and small sections. Some areas appear not to have received a comprehensive update since
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I suspect that if we find an Earth-sized body that is technically a DP, then the IAU will revisit their definition of "planet" and modify it so that the new body counts as a planet. After all, technically Mercury is a SSSB, but everyone ignores that and calls it a planet anyway. —
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enough evidence to tell which bodies are planemos. So the IAU definition is practical, whether one agrees with it or not, as long as we don't discover an Earth-sized body in the outer Solar system that throws everything into chaos again the way the discovery of Eris did.
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I am circling back to this discussion because I see that there are still uncited passages in the article. Has the necessary updates been made yet? If not, is anyone interested in working on this article, or would someone like to nominate this to
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Yes, the terminology is a little unfortunate and makes it look like the distinction is about size, when it's really about dominance. But you could always use the old term "planetoid": something that's like a planet but isn't a planet.
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As long as we don't discover anything significantly larger than Pluto, I think we're fine. But if we find things that start filling in the planet-DP gap, it might become an issue again. —
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section). Science demands a record with context and debate, but this article seems like it was edited by someone with an overzealous interest in burying even the idea of dissent.
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Significant work was put into this article following my comment above, much by Kwami. Better to raise/tag any individual issues with a fresh look, rather than going into FAR.
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Dynamically, Pluto, Eris, and all others are very clearly a distinct type of object compared to the "big 8," and there is effectively zero dispute within the astronomical (
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Brown that the definition would be reexamined if anything like that were ever discovered, so we should not take that too seriously at the moment."
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The IAU already substituted science with their authority in 2006 by declaring that Pluto (and Ceres and Eris) allegedly aren't planets.
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And presumably dynamicists would ignore such a definition or pay lip-service to it the way they used to do to Pluto: call it a planet
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dynamic aspect really was, or if it was just convenient. Though it makes sense of course if you're working on the Nice Model.
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Thanks. The fact that the IAU itself is using that wording should put to rest the idea of "official" dwarf planets.
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Tancredi advised the IAU to accept Quaoar, Orcus, and Sedna as "official" "dwarf planets" (his quotes!)
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No. That's not the IAU's job. Dwarf planets are objects which meet the definition of a dwarf planet. —
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No maximum. An object as large as Mars or even Earth could be a DP if it hasn't cleared its orbit. —
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on 25 August 2011. For the contribution history and old versions of the redirected page, please see
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for that content in the latter page, and it must not be deleted as long as the latter page exists.
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soon. If not updated before age exceeds 30 days, the chart will be hidden until it is. See
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Will the IAU officially recognize Gonggong, Quaoar, Orcus, and Sedna as dwarf planets?
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I really wonder what would happen if even a Mercury-sized TNO was discovered, though.
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Yeah, it definitely needs work. Not sure I'd have the time this week. —
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An unexpected ring was discovered around dwarf planet Quaoar (p 5)
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planetary science!) community regarding Pluto's reclassification.
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What about giant planets like the gas giants and ice giants?
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Dwarf planets should only be recognized by the IAU right?
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IAU Division F report refers to Quaoar as a "dwarf planet"
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2176:— Preceding 2173: 2152:Double sharp 2111:Double sharp 2084:— Preceding 2081: 2069:Double sharp 2043: 2039: 2035: 2023:Double sharp 1996:— Preceding 1993: 1955:— Preceding 1952: 1893:— Preceding 1890: 1887:Dwarf Planet 1816: 1763: 1561: 1311: 1009: 957: 944: 928: 924: 892:Dwarf planet 881: 850:Dwarf planet 840:this version 805: 781: 759: 723: 685:Solar System 657:WikiProjects 640: 610: 579: 557: 542: 527: 512: 497: 482: 464: 463: 444: 382:please do so 366: 363:Dwarf planet 362: 348:please do so 337: 330:Dwarf planet 329: 298: 294: 290: 286: 282: 278: 271: 230: 184: 171: 165: 157: 150: 144: 138: 132: 122: 94: 25:Dwarf planet 19:This is the 2329:Kwamikagami 2201:of fact. — 2170:Recognition 1842:Kwamikagami 897:its history 524:May 4, 2020 446:Peer review 272:written in 148:free images 31:not a forum 2368:Categories 1058:should be 1046:Pageviews 918:Map needed 886:page were 586:column on 339:identified 2182:Zachbarbo 2090:Zachbarbo 2002:Zachbarbo 1961:Zachbarbo 1899:Zachbarbo 854:this edit 735:Astronomy 730:Astronomy 676:Astronomy 645:is rated 576:Main Page 283:travelled 88:if needed 71:Be polite 21:talk page 2259:ArkHyena 2190:contribs 2178:unsigned 2098:contribs 2086:unsigned 2010:contribs 1998:unsigned 1969:contribs 1957:unsigned 1907:contribs 1895:unsigned 958:Archives 933:included 647:FA-class 564:Promoted 519:Promoted 504:Promoted 489:Promoted 451:Reviewed 295:artefact 186:Archives 56:get help 29:This is 27:article. 2349:— kwami 1819:Serendi 1061:updated 1048:summary 1010:60 days 858:history 762:on the 578:in the 549:Demoted 534:Demoted 429:Process 299:analyse 291:defence 231:60 days 154:WP refs 142:scholar 2299:Nrco0e 1849:WP:FAR 888:merged 653:scale. 470:Listed 432:Result 370:series 287:centre 279:colour 126:Google 2289:(p 2) 2203:kwami 2129:kwami 2047:kwami 1981:kwami 1919:kwami 1853:Z1720 1782:kwami 1667:09-14 1659:09-13 1651:09-12 1643:09-11 1635:09-10 1627:09-09 1619:09-08 1611:09-07 1603:09-06 1595:09-05 1587:09-04 1579:09-03 1571:09-02 1562:09-01 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754:Top 176:TWL 2370:: 2355:) 2341:) 2320:) 2305:) 2284:: 2265:) 2247:) 2227:) 2209:) 2192:) 2188:• 2158:) 2135:) 2117:) 2100:) 2096:• 2075:) 2053:) 2029:) 2012:) 2008:• 1987:) 1971:) 1967:• 1939:) 1925:) 1909:) 1905:• 1873:) 1859:) 1851:? 1815:. 1805:) 1788:) 1773:) 814:). 683:/ 679:: 297:, 293:, 289:, 285:, 281:, 229:: 221:, 217:, 213:, 209:, 205:, 201:, 197:, 193:, 156:) 54:; 2351:( 2337:( 2331:: 2327:@ 2316:( 2301:( 2261:( 2243:( 2223:( 2205:( 2184:( 2154:( 2131:( 2113:( 2092:( 2071:( 2064:. 2049:( 2025:( 2004:( 1983:( 1963:( 1935:( 1921:( 1901:( 1869:( 1855:( 1844:: 1836:@ 1801:( 1784:( 1769:( 1740:│ 1734:│ 1728:│ 1722:│ 1716:│ 1710:│ 1704:│ 1698:│ 1692:│ 1686:│ 1681:0 1678:│ 1068:. 939:. 904:. 790:. 766:. 659:: 590:. 584:" 580:" 384:. 350:. 313:. 223:8 219:7 215:6 211:5 207:4 203:3 199:2 195:1 188:: 172:· 166:· 158:· 151:· 145:· 139:· 133:· 128:( 58:.

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