List of unnumbered minor planets: 2003 X–Y

This is a partial list of unnumbered minor planets for principal provisional designations assigned during 1–31 December 2003. , a total of 105 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.

X

|- id="2003 XH" bgcolor=#FA8072 | 0 || 2003 XH || MCA || 18.4 || 1.2 km || multiple || 2003–2018 || 11 Aug 2018 || 114 || align=left | Disc.: LINEAR || |- id="2003 XK" bgcolor=#FFC2E0 | 8 || 2003 XK || APO || 25.9 || data-sort-value="0.023" | 23 m || single || 3 days || 04 Dec 2003 || 16 || align=left | Disc.: LINEAR || |- id="2003 XM" bgcolor=#FFC2E0 | 0 || 2003 XM || AMO || 19.28 || data-sort-value="0.49" | 490 m || multiple || 2003–2021 || 09 Jan 2021 || 149 || align=left | Disc.: LINEAR || |- id="2003 XV" bgcolor=#FFC2E0 | 0 || 2003 XV || APO || 26.7 || data-sort-value="0.016" | 16 m || multiple || 2003–2011 || 06 Dec 2011 || 74 || align=left | Disc.: Spacewatch || |- id="2003 XW" bgcolor=#FA8072 | 0 || 2003 XW || MCA || 18.77 || data-sort-value="0.73" | 730 m || multiple || 2003-2026 || 08 Feb 2026 || 176 || align=left | Disc.: LINEAR || |- id="2003 XN1" bgcolor=#d6d6d6 | 1 || || MBA-O || 17.4 || 1.8 km || multiple || 2003–2021 || 06 Jan 2021 || 80 || align=left | Disc.: SpacewatchAlt.: 2014 SQ247 || |- id="2003 XJ7" bgcolor=#FFC2E0 | 6 || || APO || 26.4 || data-sort-value="0.019" | 19 m || single || 1 day || 06 Dec 2003 || 35 || align=left | Disc.: LINEAR || |- id="2003 XH10" bgcolor=#FFC2E0 | 6 || || APO || 25.5 || data-sort-value="0.028" | 28 m || single || 4 days || 08 Dec 2003 || 36 || align=left | Disc.: LINEAR || |- id="2003 XZ12" bgcolor=#FFC2E0 | 6 || || APO || 24.4 || data-sort-value="0.047" | 47 m || single || 10 days || 25 Dec 2003 || 30 || align=left | Disc.: LINEAR || |- id="2003 XQ28" bgcolor=#d6d6d6 | 2 || || MBA-O || 17.1 || 2.1 km || multiple || 2003–2020 || 23 Nov 2020 || 44 || align=left | Disc.: SpacewatchAdded on 17 January 2021 || |- id="2003 XM34" bgcolor=#fefefe | 0 || || MBA-I || 18.8 || data-sort-value="0.52" | 520 m || multiple || 2003–2020 || 14 Nov 2020 || 57 || align=left | Disc.: LPL/Spacewatch II || |- id="2003 XX39" bgcolor=#d6d6d6 | 1 || || MBA-O || 17.7 || 1.6 km || multiple || 2003–2020 || 15 Oct 2020 || 61 || align=left | Disc.: LINEARAdded on 11 May 2021Alt.: 2020 OE10 || |- id="2003 XN43" bgcolor=#d6d6d6 | 2 || || HIL || 15.6 || 4.2 km || multiple || 2003–2021 || 09 Apr 2021 || 37 || align=left | Disc.: LINEARAlt.: 2021 CW34 || |- id="2003 XR43" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.2 || 2.0 km || multiple || 2003–2020 || 22 Jan 2020 || 47 || align=left | Disc.: Spacewatch || |- id="2003 XY43" bgcolor=#d6d6d6 | 1 || || MBA-O || 17.3 || 1.9 km || multiple || 2003–2019 || 03 Dec 2019 || 38 || align=left | Disc.: Spacewatch || |- id="2003 XL45" bgcolor=#fefefe | 0 || || MBA-I || 17.99 || data-sort-value="0.75" | 750 m || multiple || 2003–2021 || 06 Dec 2021 || 29 || align=left | Disc.: Spacewatch || |- id="2003 XM45" bgcolor=#E9E9E9 | 2 || || MBA-M || 19.1 || data-sort-value="0.64" | 640 m || multiple || 2003–2020 || 12 Sep 2020 || 21 || align=left | Disc.: Spacewatch || |- id="2003 XY45" bgcolor=#fefefe | 1 || || MBA-I || 19.1 || data-sort-value="0.45" | 450 m || multiple || 2003–2020 || 20 Oct 2020 || 50 || align=left | Disc.: Spacewatch || |- id="2003 XM46" bgcolor=#d6d6d6 | 0 || = (887279) || MBA-O || 17.84 || 1.5 km || multiple || 2003–2021 || 15 Apr 2021 || 53 || align=left | Disc.: LPL/Spacewatch IIAlt.: 2010 CE167 || |- id="2003 XN46" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.2 || 2.0 km || multiple || 2003–2019 || 29 Sep 2019 || 25 || align=left | Disc.: Spacewatch || |- id="2003 XP46" bgcolor=#fefefe | 3 || || MBA-I || 18.9 || data-sort-value="0.49" | 490 m || multiple || 2003–2020 || 08 Dec 2020 || 53 || align=left | Disc.: SpacewatchAdded on 17 January 2021 || |- id="2003 XQ46" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.32 || 1.2 km || multiple || 1998–2021 || 07 Sep 2021 || 34 || align=left | Disc.: SpacewatchAdded on 17 June 2021 || |- id="2003 XV46" bgcolor=#fefefe | 0 || || MBA-I || 19.07 || data-sort-value="0.46" | 460 m || multiple || 2003–2021 || 09 Dec 2021 || 46 || align=left | Disc.: SpacewatchAdded on 24 December 2021 ||

Y

|- id="2003 YM" bgcolor=#FA8072 | 0 || 2003 YM || MCA || 16.7 || 1.9 km || multiple || 2000–2021 || 14 Jan 2021 || 85 || align=left | — || |- id="2003 YN1" bgcolor=#FFC2E0 | 7 || || APO || 24.9 || data-sort-value="0.037" | 37 m || single || 12 days || 27 Dec 2003 || 23 || align=left | AMO at MPC || |- id="2003 YP1" bgcolor=#FFC2E0 | 5 || || APO || 21.8 || data-sort-value="0.16" | 160 m || single || 56 days || 30 Jan 2004 || 69 || align=left | Potentially hazardous object || |- id="2003 YQ1" bgcolor=#FFC2E0 | 6 || || AMO || 22.0 || data-sort-value="0.14" | 140 m || single || 23 days || 10 Jan 2004 || 54 || align=left | — || |- id="2003 YR1" bgcolor=#FFC2E0 | 3 || || ATE || 22.2 || data-sort-value="0.13" | 130 m || multiple || 2003–2020 || 21 Dec 2020 || 58 || align=left | — || |- id="2003 YS1" bgcolor=#FFC2E0 | 6 || || APO || 19.6 || data-sort-value="0.43" | 430 m || single || 27 days || 13 Jan 2004 || 47 || align=left | — || |- id="2003 YW1" bgcolor=#FFC2E0 | 2 || || AMO || 22.2 || data-sort-value="0.13" | 130 m || multiple || 2003–2019 || 07 Jan 2019 || 46 || align=left | — || |- id="2003 YL2" bgcolor=#FA8072 | 0 || || MCA || 18.05 || 1.4 km || multiple || 2003–2021 || 03 Dec 2021 || 122 || align=left | — || |- id="2003 YQ2" bgcolor=#E9E9E9 | – || || MBA-M || 18.1 || data-sort-value="0.71" | 710 m || single || 3 days || 21 Dec 2003 || 17 || align=left | — || |- id="2003 YP3" bgcolor=#FFC2E0 | 0 || || APO || 20.22 || data-sort-value="0.32" | 320 m || multiple || 2003–2021 || 10 Jul 2021 || 169 || align=left | — || |- id="2003 YR4" bgcolor=#FA8072 | 0 || || MCA || 17.9 || data-sort-value="0.78" | 780 m || multiple || 2003–2021 || 14 Jan 2021 || 41 || align=left | — || |- id="2003 YM7" bgcolor=#FA8072 | 0 || || MCA || 19.2 || data-sort-value="0.43" | 430 m || multiple || 2003–2020 || 22 Mar 2020 || 97 || align=left | — || |- id="2003 YN7" bgcolor=#FFC2E0 | 6 || || APO || 20.6 || data-sort-value="0.27" | 270 m || single || 25 days || 13 Jan 2004 || 74 || align=left | — || |- id="2003 YG8" bgcolor=#fefefe | 0 || || HUN || 18.8 || data-sort-value="0.52" | 520 m || multiple || 2003–2021 || 04 Dec 2021 || 39 || align=left | Disc.: LINEARAdded on 24 December 2021 || |- id="2003 YS17" bgcolor=#FFC2E0 | 2 || || ATE || 21.6 || data-sort-value="0.17" | 170 m || multiple || 2003–2021 || 08 Jan 2021 || 204 || align=left | Potentially hazardous object || |- id="2003 YH22" bgcolor=#fefefe | 0 || || HUN || 18.4 || data-sort-value="0.62" | 620 m || multiple || 2003–2020 || 15 Feb 2020 || 38 || align=left | — || |- id="2003 YD45" bgcolor=#FFC2E0 | 6 || || APO || 21.0 || data-sort-value="0.22" | 220 m || single || 30 days || 19 Jan 2004 || 56 || align=left | Potentially hazardous object || |- id="2003 YL49" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.53 || 1.7 km || multiple || 2003–2022 || 05 Jan 2022 || 68 || align=left | — || |- id="2003 YF67" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.99 || 1.4 km || multiple || 2003–2021 || 08 Nov 2021 || 84 || align=left | — || |- id="2003 YM67" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.2 || data-sort-value="0.68" | 680 m || multiple || 2003–2020 || 24 Dec 2020 || 20 || align=left | Disc.: SpacewatchAdded on 17 January 2021 || |- id="2003 YT67" bgcolor=#fefefe | 0 || || MBA-I || 18.7 || data-sort-value="0.54" | 540 m || multiple || 2003–2020 || 15 Oct 2020 || 40 || align=left | Disc.: SpacewatchAdded on 17 January 2021 || |- id="2003 YX67" bgcolor=#fefefe | 0 || || MBA-I || 18.7 || data-sort-value="0.54" | 540 m || multiple || 2003–2021 || 18 Jan 2021 || 61 || align=left | — || |- id="2003 YQ70" bgcolor=#FA8072 | – || || MCA || 19.2 || data-sort-value="0.43" | 430 m || single || 8 days || 30 Dec 2003 || 28 || align=left | — || |- id="2003 YS70" bgcolor=#FFC2E0 | 5 || || APO || 29.1 || data-sort-value="0.0054" | 5 m || single || 5 days || 27 Dec 2003 || 70 || align=left | — || |- id="2003 YT70" bgcolor=#FFC2E0 | 7 || || AMO || 25.8 || data-sort-value="0.025" | 25 m || single || 22 days || 13 Jan 2004 || 24 || align=left | — || |-id="2003 YA74" bgcolor=#d6d6d6 | 1 || || MBA-O || 17.2 || 2.0 km || multiple || 2003–2018 || 13 Dec 2018 || 26 || align=left | — || |- id="2003 YN93" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.72 || 1.6 km || multiple || 2003–2022 || 08 Jan 2022 || 32 || align=left | — || |- id="2003 YP94" bgcolor=#FFC2E0 | 7 || || APO || 23.8 || data-sort-value="0.062" | 62 m || single || 11 days || 02 Jan 2004 || 38 || align=left | AMO at MPC || |- id="2003 YN107" bgcolor=#FFC2E0 | 2 || || ATE || 26.5 || data-sort-value="0.018" | 18 m || multiple || 2003–2005 || 31 Mar 2005 || 45 || align=left | — || |- id="2003 YH111" bgcolor=#FFC2E0 | 6 || || APO || 24.5 || data-sort-value="0.045" | 45 m || single || 2 days || 29 Dec 2003 || 115 || align=left | — || |- id="2003 YJ117" bgcolor=#FA8072 | 1 || || MCA || 18.98 || data-sort-value="0.68" | 680 m || multiple || 2003-2022 || 24 Dec 2022 || 51 || align=left | — || |- id="2003 YR117" bgcolor=#FFC2E0 | 7 || || APO || 22.9 || data-sort-value="0.093" | 93 m || single || 15 days || 12 Jan 2004 || 45 || align=left | — || |- id="2003 YE118" bgcolor=#FFC2E0 | 2 || || APO || 21.83 || data-sort-value="0.15" | 150 m || multiple || 2003–2022 || 03 Jan 2022 || 110 || align=left | Potentially hazardous object || |- id="2003 YK132" bgcolor=#FA8072 | 0 || || MCA || 19.5 || data-sort-value="0.37" | 370 m || multiple || 2003–2021 || 11 Mar 2021 || 71 || align=left | Disc.: LINEARAdded on 11 May 2021Alt.: 2013 TA213 || |- id="2003 YG136" bgcolor=#FFC2E0 | 7 || || ATE || 25.3 || data-sort-value="0.031" | 31 m || single || 4 days || 01 Jan 2004 || 21 || align=left | — || |- id="2003 YH136" bgcolor=#FFC2E0 | 1 || || APO || 19.14 || data-sort-value="0.47" | 520 m || multiple || 2003-2023 || 16 Nov 2023 || 80 || align=left Alt.: 2023 VQ9 | Potentially hazardous object || |- id="2003 YJ136" bgcolor=#FFC2E0 | 1 || || AMO || 20.55 || data-sort-value="0.25" | 250 m || multiple || 2003-2025 || 23 Dec 2025 || 40 || align=left | — || |- id="2003 YA152" bgcolor=#FA8072 | 0 || || MCA || 19.3 || data-sort-value="0.41" | 410 m || multiple || 2003–2019 || 09 Feb 2019 || 79 || align=left | Alt.: 2018 VN4 || |- id="2003 YH153" bgcolor=#FA8072 | 0 || || MCA || 18.6 || data-sort-value="0.57" | 570 m || multiple || 2003–2017 || 11 Oct 2017 || 84 || align=left | — || |- id="2003 YA164" bgcolor=#d6d6d6 | 2 || || MBA-O || 17.1 || 2.1 km || multiple || 2003–2020 || 17 Dec 2020 || 51 || align=left | Disc.: SpacewatchAdded on 17 January 2021 || |- id="2003 YV173" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.53 || 1.7 km || multiple || 2003–2021 || 09 Apr 2021 || 53 || align=left | Alt.: 2010 KC77 || |- id="2003 YG176" bgcolor=#fefefe | 0 || || MBA-I || 19.5 || data-sort-value="0.37" | 370 m || multiple || 2003–2021 || 12 Aug 2021 || 33 || align=left | Disc.: Mauna Kea Obs.Added on 21 August 2021Alt.: 2014 WQ14 || |- id="2003 YH176" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.3 || 1.9 km || multiple || 2003–2021 || 04 Jan 2021 || 43 || align=left | Alt.: 2005 GJ195, 2010 AA18 || |- id="2003 YK177" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.9 || 1.5 km || multiple || 2003–2021 || 07 Nov 2021 || 26 || align=left | Disc.: Mauna Kea Obs.Added on 29 January 2022 || |- id="2003 YJ179" bgcolor=#C2E0FF | 2 || || TNO || 7.1 || 126 km || multiple || 2003–2019 || 08 Feb 2019 || 28 || align=left | LoUTNOs, cubewano (cold) || |- id="2003 YK179" bgcolor=#C2E0FF | 5 || || TNO || 7.5 || 132 km || multiple || 2003–2012 || 14 Nov 2012 || 19 || align=left | LoUTNOs, other TNO || |- id="2003 YM179" bgcolor=#C2E0FF