List of unnumbered minor planets: 2003 U (430–619)

This is a partial list of unnumbered minor planets for principal provisional designations assigned during 16–31 October 2003. Since this period yielded a high number of provisional discoveries, it is further split into several standalone pages. , a total of 129 bodies remain unnumbered for this period. Objects for this year are listed on the following pages: A–E · F–G · H–L · M–R · Si · Sii · Siii · Siv · T · Ui · Uii · Uiii · Uiv · V · Wi · Wii and X–Y. Also see previous and next year.

U

|- id="2003 UD430" bgcolor=#fefefe | 0 || || MBA-I || 18.8 || data-sort-value="0.52" | 520 m || multiple || 2003–2018 || 07 Mar 2018 || 36 || align=left | — || |- id="2003 UN430" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.1 || data-sort-value="0.71" | 710 m || multiple || 2003–2019 || 10 Jun 2019 || 36 || align=left | — || |- id="2003 UR430" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.72 || 1.6 km || multiple || 2003–2021 || 08 Aug 2021 || 52 || align=left | — || |- id="2003 UZ430" bgcolor=#d6d6d6 | 1 || || MBA-O || 17.1 || 2.1 km || multiple || 2003–2020 || 15 Oct 2020 || 33 || align=left | — || |- id="2003 UB431" bgcolor=#fefefe | 0 || || MBA-I || 18.7 || data-sort-value="0.54" | 540 m || multiple || 2003–2020 || 23 Sep 2020 || 51 || align=left | — || |- id="2003 UC431" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.1 || 2.1 km || multiple || 2003–2020 || 05 Dec 2020 || 71 || align=left | — || |- id="2003 UD431" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.6 || 1.7 km || multiple || 2003–2019 || 03 Dec 2019 || 35 || align=left | — || |- id="2003 UK431" bgcolor=#fefefe | 0 || || MBA-I || 19.2 || data-sort-value="0.43" | 430 m || multiple || 2003–2017 || 22 Oct 2017 || 29 || align=left | — || |- id="2003 UM431" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.3 || data-sort-value="0.65" | 650 m || multiple || 2003–2019 || 25 Jul 2019 || 32 || align=left | Alt.: 2010 NV139 || |- id="2003 UN431" bgcolor=#FA8072 | 1 || || HUN || 19.3 || data-sort-value="0.41" | 410 m || multiple || 2003–2020 || 14 Nov 2020 || 55 || align=left | — || |- id="2003 UP431" bgcolor=#fefefe | 0 || || MBA-I || 19.6 || data-sort-value="0.36" | 360 m || multiple || 2003–2021 || 04 Jan 2021 || 34 || align=left | — || |- id="2003 UQ431" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.82 || 1.5 km || multiple || 2003–2022 || 06 Jan 2022 || 33 || align=left | — || |- id="2003 UR431" bgcolor=#fefefe | 1 || || MBA-I || 19.4 || data-sort-value="0.39" | 390 m || multiple || 2003–2017 || 14 Nov 2017 || 21 || align=left | — || |- id="2003 US431" bgcolor=#E9E9E9 | 0 || = (887259) || MBA-M || 18.5 || data-sort-value="0.84" | 840 m || multiple || 2003–2020 || 11 Oct 2020 || 25 || align=left | — || |- id="2003 UN433" bgcolor=#fefefe | 0 || || HUN || 19.18 || data-sort-value="0.43" | 430 m || multiple || 2003–2021 || 20 Apr 2021 || 68 || align=left | — || |- id="2003 UX433" bgcolor=#fefefe | 0 || || MBA-I || 19.1 || data-sort-value="0.45" | 450 m || multiple || 2003–2019 || 24 Jul 2019 || 52 || align=left | — || |- id="2003 UO434" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.3 || data-sort-value="0.65" | 650 m || multiple || 2003–2019 || 01 Jun 2019 || 49 || align=left | — || |- id="2003 UA435" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.7 || data-sort-value="0.54" | 540 m || multiple || 2003–2019 || 27 Nov 2019 || 47 || align=left | — || |- id="2003 UB435" bgcolor=#d6d6d6 | 0 || || HIL || 16.3 || 3.1 km || multiple || 2003–2019 || 28 Nov 2019 || 47 || align=left | — || |- id="2003 UO435" bgcolor=#fefefe | 0 || || MBA-I || 18.6 || data-sort-value="0.57" | 570 m || multiple || 2003–2018 || 11 Nov 2018 || 41 || align=left | — || |- id="2003 UP435" bgcolor=#fefefe | 0 || || MBA-I || 19.00 || data-sort-value="0.47" | 470 m || multiple || 2003–2021 || 30 Sep 2021 || 48 || align=left | — || |- id="2003 UU435" bgcolor=#fefefe | 0 || || MBA-I || 18.6 || data-sort-value="0.57" | 570 m || multiple || 2003–2021 || 11 Jun 2021 || 59 || align=left | — || |- id="2003 UW435" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.0 || 2.2 km || multiple || 2003–2019 || 27 Nov 2019 || 36 || align=left | — || |- id="2003 UX435" bgcolor=#FA8072 | 0 || || MCA || 18.6 || data-sort-value="0.57" | 570 m || multiple || 2003–2019 || 31 May 2019 || 40 || align=left | — || |- id="2003 UL436" bgcolor=#fefefe | 0 || || MBA-I || 19.1 || data-sort-value="0.45" | 450 m || multiple || 2003–2019 || 01 Jun 2019 || 47 || align=left | — || |- id="2003 UO436" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.3 || data-sort-value="0.65" | 650 m || multiple || 1995–2019 || 25 Sep 2019 || 41 || align=left | — || |- id="2003 UP436" bgcolor=#fefefe | 0 || || MBA-I || 18.79 || data-sort-value="0.52" | 520 m || multiple || 2003–2021 || 01 Nov 2021 || 52 || align=left | — || |- id="2003 US436" bgcolor=#d6d6d6 | 1 || || MBA-O || 16.9 || 2.3 km || multiple || 2003–2019 || 05 Nov 2019 || 35 || align=left | — || |- id="2003 UV436" bgcolor=#fefefe | 0 || = (887260) || MBA-I || 18.4 || data-sort-value="0.62" | 620 m || multiple || 2003–2020 || 21 Apr 2020 || 43 || align=left | — || |- id="2003 UW436" bgcolor=#fefefe | 0 || || MBA-I || 18.89 || data-sort-value="0.50" | 500 m || multiple || 2003–2018 || 03 Nov 2018 || 37 || align=left | — || |- id="2003 UZ436" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.9 || 1.5 km || multiple || 2003–2018 || 14 Aug 2018 || 36 || align=left | — || |- id="2003 UB437" bgcolor=#fefefe | 0 || || MBA-I || 18.58 || data-sort-value="0.57" | 570 m || multiple || 2003–2021 || 07 Nov 2021 || 38 || align=left | — || |- id="2003 UE437" bgcolor=#d6d6d6 | 1 || || HIL || 16.7 || 2.5 km || multiple || 2003–2019 || 08 Nov 2019 || 33 || align=left | — || |- id="2003 UF437" bgcolor=#fefefe | 0 || || MBA-I || 19.02 || data-sort-value="0.47" | 470 m || multiple || 2003–2022 || 27 Jan 2022 || 46 || align=left | — || |- id="2003 UH437" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.8 || data-sort-value="0.52" | 520 m || multiple || 2003–2019 || 27 Oct 2019 || 32 || align=left | — || |- id="2003 UK438" bgcolor=#fefefe | 0 || || MBA-I || 19.2 || data-sort-value="0.43" | 430 m || multiple || 2003–2019 || 03 Oct 2019 || 54 || align=left | — || |- id="2003 UF439" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.9 || data-sort-value="0.78" | 780 m || multiple || 2003–2019 || 28 Aug 2019 || 42 || align=left | — || |- id="2003 UQ439" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.2 || data-sort-value="0.68" | 680 m || multiple || 2003–2019 || 28 Aug 2019 || 37 || align=left | — || |- id="2003 UC440" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.19 || 1.3 km || multiple || 2003–2021 || 13 Sep 2021 || 38 || align=left | — || |- id="2003 UH440" bgcolor=#fefefe | 0 || || MBA-I || 18.8 || data-sort-value="0.52" | 520 m || multiple || 2003–2018 || 16 Jan 2018 || 30 || align=left | — || |- id="2003 UJ440" bgcolor=#fefefe | 0 || = (887261) || MBA-I || 18.75 || data-sort-value="0.53" | 530 m || multiple || 2003–2021 || 30 Jun 2021 || 41 || align=left | — || |- id="2003 UN440" bgcolor=#fefefe | 0 || || MBA-I || 18.9 || data-sort-value="0.49" | 490 m || multiple || 2003–2019 || 25 May 2019 || 32 || align=left | — || |- id="2003 UQ440" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.2 || 2.0 km || multiple || 2003–2019 || 24 Aug 2019 || 28 || align=left | — || |- id="2003 US440" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.6 || 1.7 km || multiple || 2003–2019 || 24 Sep 2019 || 36 || align=left | — || |- id="2003 UT440" bgcolor=#fefefe | 0 || || MBA-I || 19.1 || data-sort-value="0.45" | 450 m || multiple || 2003–2018 || 09 Nov 2018 || 22 || align=left | — || |- id="2003 UF441" bgcolor=#fefefe | 2 || || MBA-I || 19.1 || data-sort-value="0.45" | 450 m || multiple || 2003–2019 || 04 Dec 2019 || 49 || align=left | — || |- id="2003 UO441" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.5 || 1.8 km || multiple || 2003–2021 || 18 Jan 2021 || 47 || align=left | — || |- id="2003 UQ441" bgcolor=#E9E9E9 | 1 || || MBA-M || 17.8 || data-sort-value="0.82" | 820 m || multiple || 2003–2020 || 26 Nov 2020 || 40 || align=left | — || |- id="2003 UT441" bgcolor=#fefefe | 0 || = (887262) || MBA-I || 19.0 || data-sort-value="0.47" | 470 m || multiple || 2003–2019 || 24 Oct 2019 || 44 || align=left | — || |- id="2003 UW441" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.3 || 1.9 km || multiple || 2003–2019 || 03 Oct 2019 || 25 || align=left | — || |- id="2003 UX441" bgcolor=#fefefe | 0 || || MBA-I || 19.2 || data-sort-value="0.43" | 430 m || multiple || 2003–2019 || 23 Oct 2019 || 31 || align=left | — || |- id="2003 UY441" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.78 || 1.5 km || multiple || 2003–2019 || 20 Dec 2019 || 43 || align=left | Alt.: 2019 SB12 || |- id="2003 UQ442" bgcolor=#fefefe | 0 || = (887263) || MBA-I || 18.4 || data-sort-value="0.62" | 620 m || multiple || 2003–2020 || 12 Sep 2020 || 43 || align=left | — || |- id="2003 UZ442" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.2 || 2.0 km || multiple || 2003–2019 || 26 Oct 2019 || 34 || align=left | — || |- id="2003 UB443" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.6 || 1.7 km || multiple || 2003–2019 || 28 Dec 2019 || 40 || align=left | — || |- id="2003 UF443" bgcolor=#E9E9E9 | 0 || = (887264) || MBA-M || 18.16 || 1.3 km || multiple || 2003–2021 || 29 Oct 2021 || 55 || align=left | — || |- id="2003 UJ443" bgcolor=#E9E9E9 | 1 || || MBA-M || 19.1 || data-sort-value="0.45" | 450 m || multiple || 2003–2019 || 25 Jul 2019 || 43 || align=left | — || |- id="2003 UP443" bgcolor=#d6d6d6 | 1 || || HIL || 16.5 || 2.8 km || multiple || 2003–2019 || 04 Nov 2019 || 32 || align=left | — || |- id="2003 UU443" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.8 || 1.5 km || multiple || 2003–2021 || 16 Jan 2021 || 32 || align=left | — || |- id="2003 UV443" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.4 || 1.8 km || multiple || 2003–2021 || 18 Jan 2021 || 39 || align=left | — || |- id="2003 UY443" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.0 || data-sort-value="0.75" | 750 m || multiple || 2003–2020 || 17 Dec 2020 || 30 || align=left | — || |- id="2003 UB444" bgcolor=#fefefe | 1 || || MBA-I || 19.5 || data-sort-value="0.37" | 370 m || multiple || 2003–2016 || 27 Aug 2016 || 34 || align=left | — || |- id="2003 UD444" bgcolor=#d6d6d6 | 3 || || MBA-O || 18.6 || 1.1 km || multiple || 2003–2019 || 26 Sep 2019 || 19 || align=left | —Added on 22 July 2020 || |- id="2003 UG444" bgcolor=#d6d6d6 | 1 || || MBA-O || 17.6 || 1.7 km || multiple || 2003–2018 || 06 Oct 2018 || 37 || align=left | —Added on 22 July 2020 || |- id="2003 UJ444" bgcolor=#d6d6d6 | 1 || || MBA-O || 16.6 || 2.7 km || multiple || 2003–2019 || 28 Dec 2019 || 35 || align=left | —Added on 22 July 2020 || |- id="2003 UP444" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.4 || data-sort-value="0.62" | 620 m || multiple || 2003–2019 || 03 Oct 2019 || 35 || align=left | —Added on 22 July 2020 || |- id="2003 UU444" bgcolor=#FA8072 | 0 || || MCA || 19.0 || data-sort-value="0.47" | 470 m || multiple || 2003–2020 || 15 Aug 2020 || 36 || align=left | Disc.: NEATAdded on 19 October 2020 || |- id="2003 UZ444" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.3 || 1.9 km || multiple || 2003–2020 || 14 Nov 2020 || 52 || align=left | Disc.: LPL/Spacewatch IIAdded on 19 October 2020 || |- id="2003 UE445" bgcolor=#fefefe | 0 || || MBA-I || 18.67 || data-sort-value="0.55" | 550 m || multiple || 2003–2021 || 02 Dec 2021 || 70 || align=left | Disc.: SpacewatchAdded on 19 October 2020 || |- id="2003 UF445" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.00 || 1.1 km || multiple || 2003–2022 || 27 Jan 2022 || 45 || align=left | Disc.: LPL/Spacewatch IIAdded on 19 October 2020 || |- id="2003 UH445" bgcolor=#fefefe | 2 || || MBA-I || 18.7 || data-sort-value="0.54" | 540 m || multiple || 2003–2017 || 24 Oct 2017 || 28 || align=left | Disc.: LPL/Spacewatch IIAdded on 19 October 2020 || |- id="2003 UJ445" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.80 || data-sort-value="0.97" | 970 m || multiple || 2003–2021 || 01 Dec 2021 || 20 || align=left | Disc.: SpacewatchAdded on 19 October 2020 || |- id="2003 UK445" bgcolor=#E9E9E9