List of unnumbered minor planets: 1999 S–T

This is a partial list of unnumbered minor planets for principal provisional designations assigned between 16 September and 15 October 1999. , a total of 111 bodies remain unnumbered for this period. Objects for this year are listed on the following pages: A–R · S–T and U–Y. Also see previous and next year.

S

|- id="1999 SO" bgcolor=#fefefe | 0 || 1999 SO || MBA-I || 18.98 || data-sort-value="0.54" | 500 m || multiple || 1999–2022 || 29 Nov 2022 || 36 || align=left | Disc.: SpacewatchAdded on 11 May 2021Alt.: 2014 PS86 || |- id="1999 SK1" bgcolor=#fefefe | 2 || || MBA-I || 19.0 || data-sort-value="0.47" | 470 m || multiple || 1999–2019 || 24 Aug 2019 || 43 || align=left | Disc.: NRC || |- id="1999 SK5" bgcolor=#FA8072 | 0 || || MCA || 18.19 || data-sort-value="0.68" | 680 m || multiple || 1999-2022 || 02 Dec 2022 || 96 || align=left | Disc.: LINEAR Alt.: 2022 SV2 || |- id="1999 SE10" bgcolor=#FFC2E0 | 0 || || AMO || 20.35 || data-sort-value="0.36" | 310 m || multiple || 1999-2022 || 11 Oct 2022 || 110 || align=left | Disc.: LINEAR || |- id="1999 SF10" bgcolor=#FFC2E0 | 0 || || APO || 24.41 || data-sort-value="0.049" | 49 m || multiple || 1999–2025 || 24 Dec 2025 || 77 || align=left | Disc.: LINEAR || |- id="1999 SG10" bgcolor=#FFC2E0 | 2 || || APO || 20.5 || data-sort-value="0.28" | 280 m || multiple || 1999–2020 || 20 Oct 2020 || 115 || align=left | Disc.: LINEARPotentially hazardous object || |- id="1999 SH10" bgcolor=#FFC2E0 | 0 || || APO || 22.73 || data-sort-value="0.10" | 100 m || multiple || 1999–2022 || 06 Jan 2022 || 85 || align=left | Disc.: LINEAR || |- id="1999 SZ23" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.06 || 1.5 km || multiple || 1999–2022 || 17 Nov 2022 || 74 || align=left | Disc.: SpacewatchAlt.: 2006 HX143 || |- id="1999 SM25" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.44 || 1.0 km || multiple || 1999–2025 || 25 Aug 2025 || 55 || align=left | Disc.: 5SpacewatchAdded on 24 December 2021 || |- id="1999 SA28" bgcolor=#C2E0FF | E || || TNO || 7.3 || 164 km || single || 1 day || 17 Sep 1999 || 6 || align=left | Disc.: Mauna Kea Obs.LoUTNOs, plutino? ||

T

|- id="1999 TY2" bgcolor=#FFC2E0 | 5 || || APO || 23.3 || data-sort-value="0.078" | 78 m || single || 5 days || 08 Oct 1999 || 114 || align=left | Disc.: CSS || |- id="1999 TE3" bgcolor=#d6d6d6 | 0 || || MBA-O || 16.9 || 2.3 km || multiple || 1999-2021 || 11 Oct 2021 || 95 || align=left | Disc.: Prescott Obs.Alt.: 2010 OS125 || |- id="1999 TR4" bgcolor=#FA8072 | 1 || || HUN || 18.3 || data-sort-value="0.65" | 650 m || multiple || 1999–2020 || 09 Dec 2020 || 204 || align=left | Disc.: LINEAR || |- id="1999 TA5" bgcolor=#FFC2E0 | 0 || || AMO || 20.98 || data-sort-value="0.27" | 270 m || multiple || 1999-2025 || 15 Sep 2025 || 70 || align=left | Disc.: CSS || |- id="1999 TD5" bgcolor=#FFC2E0 | 0 || || AMO || 19.4 || data-sort-value="0.47" | 470 m || multiple || 1999–2022 || 28 Jul 2022 || 161 || align=left | Disc.: LINEAR || |- id="1999 TE5" bgcolor=#FFC2E0 | 2 || || AMO || 20.5 || data-sort-value="0.28" | 280 m || multiple || 1999–2009 || 22 Oct 2009 || 71 || align=left | Disc.: LINEAR || |- id="1999 TR11" bgcolor=#C2E0FF | 3 || || TNO || 8.43 || 99 km || multiple || 1999–2025 || 23 Feb 2025 || 34 || align=left | Disc.: Mauna Kea Obs.LoUTNOs, plutino, BR-mag: 1.77; taxonomy: RR || |- id="1999 TJ12" bgcolor=#FA8072 | 0 || || MCA || 18.28 || data-sort-value="0.66" | 660 m || multiple || 1999–2017 || 23 Dec 2017 || 190 || align=left | Disc.: LINEAR || |- id="1999 TM12" bgcolor=#FFC2E0 | 8 || || APO || 21.6 || data-sort-value="0.17" | 170 m || single || 7 days || 17 Oct 1999 || 43 || align=left | Disc.: LINEAR || |- id="1999 TM13" bgcolor=#FFC2E0 | 8 || || AMO || 23.7 || data-sort-value="0.065" | 65 m || single || 13 days || 18 Oct 1999 || 26 || align=left | Disc.: LINEAR || |- id="1999 TN13" bgcolor=#FFC2E0 | 5 || || APO || 23.6 || data-sort-value="0.068" | 68 m || single || 7 days || 18 Oct 1999 || 65 || align=left | Disc.: LINEAR || |- id="1999 TO13" bgcolor=#FFC2E0 | 7 || || APO || 21.4 || data-sort-value="0.19" | 190 m || single || 11 days || 23 Oct 1999 || 98 || align=left | Disc.: LINEARPotentially hazardous object || |- id="1999 TT16" bgcolor=#FFC2E0 | 0 || || APO || 19.77 || data-sort-value="0.39" | 390 m || multiple || 1999–2019 || 27 May 2019 || 194 || align=left | Disc.: SpacewatchPotentially hazardous object || |- id="1999 TU16" bgcolor=#FFC2E0 | 7 || || AMO || 22.1 || data-sort-value="0.14" | 140 m || single || 19 days || 30 Oct 1999 || 28 || align=left | Disc.: Spacewatch || |- id="1999 TV16" bgcolor=#FFC2E0 | 6 || || APO || 23.4 || data-sort-value="0.074" | 74 m || single || 6 days || 18 Oct 1999 || 64 || align=left | Disc.: LINEAR || |- id="1999 TW16" bgcolor=#FFC2E0 | 0 || || APO || 19.51 || data-sort-value="0.45" | 450 m || multiple || 1999–2021 || 03 Dec 2021 || 196 || align=left | Disc.: LINEAR || |- id="1999 TM23" bgcolor=#FA8072 | 4 || || MCA || 19.7 || data-sort-value="0.34" | 340 m || multiple || 1999–2019 || 02 Nov 2019 || 27 || align=left | Disc.: SpacewatchAdded on 17 June 2021Alt.: 2009 SN405 || |- id="1999 TS23" bgcolor=#E9E9E9 | E || || MBA-M || 17.9 || 1.5 km || single || 4 days || 07 Oct 1999 || 9 || align=left | Disc.: LINEAR || |- id="1999 TB24" bgcolor=#fefefe | 2 || || MBA-I || 19.31 || data-sort-value="0.45" | 450 m || multiple || 1999–2021 || 30 Nov 2021 || 39 || align=left | Disc.: LINEAR || |- id="1999 TE24" bgcolor=#fefefe | 2 || || MBA-I || 19.0 || data-sort-value="0.47" | 470 m || multiple || 1999–2020 || 14 Sep 2020 || 57 || align=left | Disc.: LINEARAlt.: 2013 RQ25 || |- id="1999 TB41" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.3 || data-sort-value="0.92" | 920 m || multiple || 1999–2020 || 11 Sep 2020 || 42 || align=left | Disc.: Spacewatch || |- id="1999 TE42" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.7 || data-sort-value="0.94" | 940 m || multiple || 1999–2024 || 12 Aug 2024 || 142 || align=left | Disc.: Spacewatch || |- id="1999 TT43" bgcolor=#fefefe | 2 || || MBA-I || 18.7 || data-sort-value="0.54" | 540 m || multiple || 1999–2018 || 17 Nov 2018 || 36 || align=left | Disc.: Spacewatch || |- id="1999 TV43" bgcolor=#FA8072 | 1 || || MCA || 19.23 || data-sort-value="0.45" | 450 m || multiple || 1999–2026 || 05 Sep 2026 || 54 || align=left | Disc.: SpacewatchAdded on 19 October 2020 || |- id="1999 TB44" bgcolor=#fefefe | 0 || || MBA-I || 19.06 || data-sort-value="0.49" | 490 m || multiple || 1999–2024 || 29 Sep 2024 || 47 || align=left | Disc.: Spacewatch || |- id="1999 TD45" bgcolor=#fefefe | 1 || || MBA-I || 19.13 || data-sort-value="0.44" | 440 m || multiple || 1999–2021 || 07 Nov 2021 || 56 || align=left | Disc.: SpacewatchAlt.: 2010 UX39 || |- id="1999 TQ45" bgcolor=#fefefe | 0 || || MBA-I || 18.89 || data-sort-value="0.50" | 500 m || multiple || 1999–2021 || 25 Nov 2021 || 61 || align=left | Disc.: Spacewatch || |- id="1999 TE46" bgcolor=#fefefe | 1 || || MBA-I || 19.18 || data-sort-value="0.57" | 570 m || multiple || 1999–2024 || 21 Dec 2024 || 49 || align=left | Disc.: Spacewatch || |- id="1999 TK46" bgcolor=#fefefe | 2 || || MBA-I || 19.3 || data-sort-value="0.41" | 410 m || multiple || 1999–2019 || 29 Sep 2019 || 30 || align=left | Disc.: SpacewatchAdded on 17 January 2021 || |- id="1999 TN47" bgcolor=#d6d6d6 | 0 || || MBA-O || 17.5 || 1.8 km || multiple || 1999–2021 || 30 Nov 2021 || 54 || align=left | Disc.: SpacewatchAdded on 29 January 2022 || |- id="1999 TT47" bgcolor=#d6d6d6 | 1 || || MBA-O || 18.21 || 1.3 km || multiple || 1999–2021 || 25 Nov 2021 || 33 || align=left | Disc.: SpacewatchAdded on 24 December 2021 || |- id="1999 TJ50" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.61 || 1.1 km || multiple || 1999–2021 || 04 Aug 2021 || 30 || align=left | Disc.: SpacewatchAdded on 24 December 2021 || |- id="1999 TF51" bgcolor=#d6d6d6 | 1 || || MBA-O || 18.43 || 1.3 km || multiple || 1999–2024 || 05 Sep 2024 || 57 || align=left | Disc.: Spacewatch || |- id="1999 TU51" bgcolor=#E9E9E9 | 2 || || MBA-M || 18.4 || data-sort-value="0.62" | 620 m || multiple || 1999–2019 || 19 Oct 2019 || 33 || align=left | Disc.: SpacewatchAdded on 21 August 2021 || |- id="1999 TA52" bgcolor=#fefefe | 2 || || MBA-I || 19.0 || data-sort-value="0.47" | 470 m || multiple || 1999–2020 || 16 Nov 2020 || 79 || align=left | Disc.: SpacewatchAlt.: 2013 RE86 || |- id="1999 TA63" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.58 || 1.3 km || multiple || 1999–2024 || 29 Sep 2024 || 73 || align=left | Disc.: Spacewatch || |- id="1999 TA66" bgcolor=#d6d6d6 | 3 || || MBA-O || 17.0 || 2.2 km || multiple || 1999–2021 || 09 Jan 2021 || 33 || align=left | Disc.: SpacewatchAdded on 17 January 2021 || |- id="1999 TO66" bgcolor=#fefefe | 2 || || MBA-I || 19.0 || data-sort-value="0.47" | 470 m || multiple || 1999–2020 || 15 Oct 2020 || 64 || align=left | Disc.: SpacewatchAdded on 19 October 2020 || |- id="1999 TU70" bgcolor=#fefefe | 1 || || MBA-I || 18.2 || data-sort-value="0.68" | 680 m || multiple || 1999–2019 || 02 Jan 2019 || 50 || align=left | Disc.: SpacewatchAlt.: 2014 QM406 || |- id="1999 TO71" bgcolor=#fefefe | 1 || || MBA-I || 18.9 || data-sort-value="0.49" | 490 m || multiple || 1999–2017 || 27 Nov 2017 || 26 || align=left | Disc.: SpacewatchAdded on 29 January 2022 || |- id="1999 TZ71" bgcolor=#fefefe | 0 || || MBA-I || 19.15 || data-sort-value="0.44" | 440 m || multiple || 1999–2021 || 28 Nov 2021 || 34 || align=left | Disc.: Spacewatch || |- id="1999 TG72" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.9 || data-sort-value="0.70" | 700 m || multiple || 1999–2020 || 11 Oct 2020 || 47 || align=left | Disc.: Spacewatch || |- id="1999 TC73" bgcolor=#fefefe | 2 || || MBA-I || 19.3 || data-sort-value="0.41" | 410 m || multiple || 1999–2020 || 17 Oct 2020 || 49 || align=left | Disc.: SpacewatchAlt.: 2013 RU142 || |- id="1999 TR73" bgcolor=#fefefe | 3 || || MBA-I || 19.5 || data-sort-value="0.37" | 370 m || multiple || 1999–2019 || 26 Nov 2019 || 33 || align=left | Disc.: Spacewatch Added on 11 May 2021Alt.: 2009 SH407 || |- id="1999 TM74" bgcolor=#fefefe | 2 || || MBA-I || 19.0 || data-sort-value="0.47" | 470 m || multiple || 1999–2020 || 16 Sep 2020 || 66 || align=left | Disc.: SpacewatchAlt.: 2006 SG213 || |- id="1999 TG75" bgcolor=#d6d6d6 | 1 || || MBA-I || 19.50 || data-sort-value="0.37" | 370 m || multiple || 1999–2019 || 02 Nov 2019 || 27 || align=left | Disc.: SpacewatchAdded on 24 December 2021 || |- id="1999 TB77" bgcolor=#fefefe | 4 || || MBA-I || 19.6 || data-sort-value="0.36" | 360 m || multiple || 1999–2016 || 07 Nov 2016 || 18 || align=left | Disc.: SpacewatchAdded on 21 August 2021 || |- id="1999 TK128" bgcolor=#E9E9E9 | 1 || || MBA-M || 17.7 || 1.2 km || multiple || 1999–2020 || 20 Oct 2020 || 49 || align=left | Disc.: LINEAR || |- id="1999 TV174" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.69 || 1.2 km || multiple || 1999–2021 || 27 Nov 2021 || 91 || align=left | Disc.: LINEARAdded on 5 November 2021 || |- id="1999 TK212" bgcolor=#E9E9E9 | 2 || || MBA-M || 17.5 || 1.8 km || multiple || 1999–2017 || 24 Nov 2017 || 142 || align=left | Disc.: LINEARAlt.: 2008 UC200 || |- id="1999 TM216" bgcolor=#FA8072 | 0 || || MCA || 18.92 || data-sort-value="0.49" | 490 m || multiple || 1999–2021 || 27 Nov 2021 || 87 || align=left | Disc.: LINEARAlt.: 2010 QF1 || |- id="1999 TU218" bgcolor=#E9E9E9 | 1 || || MBA-M || 17.6 || 1.7 km || multiple || 1999–2020 || 19 Apr 2020 || 61 || align=left | Disc.: LINEAR || |- id="1999 TR226" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.2 || data-sort-value="0.96" | 960 m || multiple || 1999–2016 || 02 Oct 2016 || 48 || align=left | Disc.: SpacewatchAlt.: 2012 VK104 || |- id="1999 TB238" bgcolor=#E9E9E9 | 1 || || MBA-M || 17.3 || 1.5 km || multiple || 1999–2016 || 14 Nov 2016 || 54 || align=left | Disc.: CSSAlt.: 2012 TA140, 2016 SB3 || |- id="1999 TX254" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.88 || 1.5 km || multiple || 1999–2021 || 30 May 2021 || 34 || align=left | Disc.: LINEAR || |- id="1999 TJ255" bgcolor=#E9E9E9