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«New» objects in our solar system?
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<blockquote data-quote="heka2015" data-source="post: 118688" data-attributes="member: 7351"><p>Direct e-mail answer from the swedish scientist about OBJECT "GNA"</p><p></p><p><em>Re: questions on discovery of Gna</em></p><p><em>Date: Sat, 12 Dec 2015 12:13:19 +0000</em></p><p><em>From: Wouter Vlemmings <wouter.vlemmings@chalmers.se></em></p><p><em>To: XXXXXXXXX XXXXXXXX</em></p><p><em></em></p><p><span style="color: #ffff00"><em>Hi,</em></span></p><p><span style="color: #ffff00"></span></p><p><span style="color: #ffff00"><em>I think I have to disappoint you on many counts.</em></span></p><p><span style="color: #ffff00"><em>We only announced, intended to colleagues only, the discovery of something that could be a nearby, few hundred km sized icy body. These are, at these distances (12-25 AU) not easily visible, certainly not with an amateur telescope. Colleagues estimate as many as few tens of thousands of such objects (>50 km) of which only almost 2000 are known so far (few discovered as long ago as you mentioned, many not; often due to pure luck; I suggest you check the publications based on the WISE satellite data). But we don't know what it is and asked for professional feedback. As of yet, no more convincing hypothesis has been suggested and further observations will need to decide if it is after all unknown artifact in the data.</em></span></p><p><span style="color: #ffff00"><em>The 87 arcsec/yr is, for those who read the paper, the extrapolated proper motion if it would be at large distance without parallax. The number is a reference to rule out anything too distant. Closer objects have a component of the parallax describing a large ellipse of the sky as detailed in the paper. </em></span></p><p><span style="color: #ffff00"></span></p><p><span style="color: #ffff00"><em>Best,</em></span></p><p><span style="color: #ffff00"><em>Wouter</em></span></p></blockquote><p></p>
[QUOTE="heka2015, post: 118688, member: 7351"] Direct e-mail answer from the swedish scientist about OBJECT "GNA" [I]Re: questions on discovery of Gna Date: Sat, 12 Dec 2015 12:13:19 +0000 From: Wouter Vlemmings <wouter.vlemmings@chalmers.se> To: XXXXXXXXX XXXXXXXX [/I] [COLOR=#ffff00][I]Hi,[/I] [I][/I] [I]I think I have to disappoint you on many counts.[/I] [I]We only announced, intended to colleagues only, the discovery of something that could be a nearby, few hundred km sized icy body. These are, at these distances (12-25 AU) not easily visible, certainly not with an amateur telescope. Colleagues estimate as many as few tens of thousands of such objects (>50 km) of which only almost 2000 are known so far (few discovered as long ago as you mentioned, many not; often due to pure luck; I suggest you check the publications based on the WISE satellite data). But we don't know what it is and asked for professional feedback. As of yet, no more convincing hypothesis has been suggested and further observations will need to decide if it is after all unknown artifact in the data.[/I] [I]The 87 arcsec/yr is, for those who read the paper, the extrapolated proper motion if it would be at large distance without parallax. The number is a reference to rule out anything too distant. Closer objects have a component of the parallax describing a large ellipse of the sky as detailed in the paper. [/I] [I][/I] [I]Best,[/I] [I]Wouter[/I][/COLOR] [/QUOTE]
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«New» objects in our solar system?
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