2008 UA332: one large TNO announced

[h2ouniverse]

<p>One big&nbsp;object announced very recently to the Minor Planet Center: 2008 UA332 at H 4.7 (480 km if&nbsp;0.1 albedo), in the Kuiper Belt, see orbit below</p><p>http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2008+UA332&orb=1</p><p>For memory, the other two big TNOs announced this year (I've cut at H<=5.1 i.e. 400km at 0.1 albedo)</p><p>2007UK126 (H 3.5) (850km if at albedo 0.1; 530km if at albedo 0.25)</p><p>2007XV50 (H 5.0) (420km if at albedo 0.1)</p><p>&nbsp;</p>

 

[MeteorWayne]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>One big&nbsp;object announced very recently to the Minor Planet Center: 2008 UA332 at H 4.7 (480 km if&nbsp;0.1 albedo), in the Kuiper Belt, see orbit belowhttp://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2008+UA332&orb=1For memory, the other two big TNOs announced this year (I've cut at H<=5.1 i.e. 400km at 0.1 albedo)2007UK126 (H 3.5) (850km if at albedo 0.1; 530km if at albedo 0.25)2007XV50 (H 5.0) (420km if at albedo 0.1)&nbsp; <br />Posted by h2ouniverse</DIV><br /><br />I should mention that the orbit is rather preliminary, since it's only a 1 day observational arc for an object at 44 AU.</p><p>Still, it is on the big side.</p><p>Just for reference, 2007 UK 126 is not on the MPC list of TNO's</p><p>The 3 other recent large ones are 2007 XV50 that you mentioned (H=5.0)</p><p>2007 JJ43 (H=4.9)</p><p>2007 JH 43 (H=4.7)</p><p>Thanx for finding this object. A near circular, 30 degree inclined orbit! (Assuming the orbit is correct)</p><p>BTW, the MPC tables give the following diameters for a 0.25 albedo</p><p>H=5.0=260km</p><p>H=4.7=330km</p> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[h2ouniverse]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Just for reference, 2007 UK 126 is not on the MPC list of Posted by MeteorWayne</DIV><br /><br />Hi Wayne,</p><p>&nbsp;Same old trap...&nbsp;2007UK126 is an SDO (and so is listed along with the centaurs in MPC site, as all other SDOs, Eris and Sedna included) What they put in the "TNO list" are in fact KBOs.</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>The 3 other recent large ones are 2007 XV50 that you mentioned (H=5.0)2007 JJ43 (H=4.9)2007 JH 43 (H=4.7)Posted by MeteorWayne</DIV><br />I've not included JJ43 and JH43 because they have been announced in 2007. (unlike 2007XV50, spotted in 2007 but announced in 2008)</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>BTW, the MPC tables give the following diameters for a 0.25 albedoH=5.0=260kmH=4.7=330km <br />Posted by MeteorWayne</DIV></p><p>Indeed. I've put the values for albedo=0.1 because medium-sized TNOs (H>4) are expected to be darker on average, although that is still to be demonstrated... I've put values at 0.1 and 0.25 for UK126 because at H=3.5 it might have a brighter albedo...</p><p>Best regards.</p>

 

[MeteorWayne]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Hi Wayne,&nbsp;Same old trap...&nbsp;2007UK126 is an SDO (and so is listed along with the centaurs in MPC site, as all other SDOs, Eris and Sedna included) What they put in the "TNO list" are in fact KBOs.I've not included JJ43 and JH43 because they have been announced in 2007. (unlike 2007XV50, spotted in 2007 but announced in 2008)Indeed. I've put the values for albedo=0.1 because medium-sized TNOs (H>4) are expected to be darker on average, although that is still to be demonstrated... I've put values at 0.1 and 0.25 for UK126 because at H=3.5 it might have a brighter albedo...Best regards. <br />Posted by h2ouniverse</DIV><br /><br />I'll have to look up the SDO list.</p><p>Hopefully, now that 2008 UA322 has been announced some follow up observations will be made to refine the orbit.</p> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[3488]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'><font color="#ff0000">I'll have to look up the SDO list.Hopefully, now that 2008 UA322 has been announced some follow up observations will be made to refine the orbit. <br /> Posted by MeteorWayne</font></DIV></p><p><font size="2"><strong>It will certainly be of immense scientific value to do so, to see where excatly&nbsp; 2008 UA322 actually 'fit' within the SDO population.</strong></font></p><p><font size="2"><strong>Some spectra & light curves would be useful too, to help get some physical data on this object.</strong></font></p><p><font size="2"><strong>Andrew Brown.</strong></font></p> <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[h2ouniverse]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Hopefully, now that 2008 UA322 has been announced some follow up observations will be made to refine the orbit. <br />Posted by MeteorWayne</DIV><br /><br />Yes, let's hope so! May be we will get the same good surprise as for 2005 QU182 with an upward revision of H... I hope it will be more than 500km in diameter. At 300 or 400, there would still be a risk for it to be potatoidal (like Proteus).</p><p>It's about time that we get a way to size all these big TNOs. This way for instance...</p><p>http://www.cosis.net/abstracts/EPSC2008/00461/EPSC2008-A-00461-1.pdf</p><p>Best regards.</p>

 

[MeteorWayne]

Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Yes, let's hope so! May be we will get the same good surprise as for 2005 QU182 with an upward revision of H... I hope it will be more than 500km in diameter. At 300 or 400, there would still be a risk for it to be potatoidal (like Proteus).It's about time that we get a way to size all these big TNOs. This way for instance...http://www.cosis.net/abstracts/EPSC2008/00461/EPSC2008-A-00461-1.pdfBest regards. <br />Posted by h2ouniverse</DIV><br /><br />LOL, great idea but quite unlikely to receive funding in our lifetime <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>