| Discovery Date | Diameter | Answer | % Correct |
|---|---|---|---|
| February 18th 1930 | 2,376km | Pluto | 98%
|
| January 5th 2005 | 2,326km | Eris | 86%
|
| March 31st 2005 | 1,430km | Makemake | 86%
|
| January 1st 1801 | 946km | Ceres | 84%
|
| March 7th 2003 | 1,560km | Haumea | 84%
|
| November 14th 2003 | 906km | Sedna | 66%
|
| July 17th 2007 | 1,230km | Gonggong | 61%
|
| June 4th 2002 | 1,086km | Quaoar | 61%
|
| February 17th 2004 | 910km | Orcus | 54%
|
| September 22nd 2004 | 846km | Salacia | 38%
|
| November 28th 2000 | 654km | Varuna | 36%
|
| May 22nd 2001 | 710km | Ixion | 30%
|
| January 21st 2003 | 749km | Varda | 30%
|
| Octkber 19th 2007 | 678km | Gǃkúnǁʼhòmdímà | 29%
|
| November 10th 2018 | 656km | 2018 VG18 | 27%
|
| August 19th 2014 | 635km | 2014 UZ224 | 23%
|
| November 5th 2012 | 574km | 2012 VP113 | 18%
|
| June 18th 2002 | 796km | 2002 MS4 | 14%
|
| January 10th 2002 | 768km | 2002 AW197 | 5%
|
| October 9th 1996 | 339km | 1996 TL66 | 4%
|
| January 13th 2003 | 723km | 2003 AZ84 | 4%
|
| March 17th 2013 | 742km | 2013 FY27 | 4%
|
| September 9th 2015 | 500km | 2015 RR245 | 4%
|
| October 30th 2002 | 665km | 2002 UX25 | 2%
|
| April 13th 2004 | 680km | 2004 GV9 | 2%
|
| September 10th 2005 | 679km | 2005 RN43 | 2%
|
| September 24th 2008 | 549km | 2008 ST291 | 2%
|
| December 10th 2002 | 565km | 2002 XW93 | 0%
|
| September 9th 2005 | 644km | 2005 RM43 | 0%
|