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. As of November 2021[update], a total of 490 bodies remain unnumbered for this period.[1][2][3][4] Objects for this year are listed on the following pages: A–R · S–T and U–Y. Also see previous and next year.

  Near-Earth obj.  

  MBA (inner)   MBA (outer)   Centaur
  Mars-crosser   MBA (middle)     Jupiter trojan    Trans-Neptunian obj.
Wikipedia list article

. . . List of unnumbered minor planets: 1999 S–T . . .

U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
0 1999 SN MBA-O 16.66 2.6 km multiple 1999–2021 29 Oct 2021 118 Disc.: Spacewatch
Added on 24 August 2020
Alt.: 2015 MQ97
MPC · JPL
2 1999 SO MBA-I 18.7 540 m multiple 1999–2018 02 Nov 2018 26 Disc.: Spacewatch
Added on 11 May 2021
Alt.: 2014 PS86
MPC · JPL
0 1999 SF1 MBA-I 18.1 710 m multiple 1999–2020 26 Jan 2020 50 Disc.: Prescott Obs. MPC · JPL
2 1999 SK1 MBA-I 19.0 470 m multiple 1999–2019 24 Aug 2019 43 Disc.: NRC MPC · JPL
1999 SK5 MCA 18.2 680 m single 17 days 17 Oct 1999 47 Disc.: LINEAR MPC · JPL
5 1999 SE10 AMO 20.0 360 m single 46 days 15 Nov 1999 84 Disc.: LINEAR MPC · JPL
1 1999 SF10 APO 24.3 49 m multiple 1999–2012 10 Dec 2012 54 Disc.: LINEAR MPC · JPL
2 1999 SG10 APO 20.5 280 m multiple 1999–2020 20 Oct 2020 115 Disc.: LINEAR
Potentially hazardous object
MPC · JPL
2 1999 SH10 APO 22.6 110 m multiple 1999–2014 19 Nov 2014 83 Disc.: LINEAR MPC · JPL
0 1999 SJ10 APO 19.79 390 m multiple 1999–2021 04 Sep 2021 76 Disc.: LINEAR MPC · JPL
0 1999 SK10 APO 19.84 380 m multiple 1999–2021 07 Apr 2021 490 Disc.: Spacewatch MPC · JPL
0 1999 SL13 MBA-M 17.44 1.8 km multiple 1999–2021 01 Nov 2021 125 Disc.: Spacewatch
Alt.: 2008 SY58
MPC · JPL
0 1999 ST20 MBA-I 18.1 710 m multiple 1999–2021 08 Jun 2021 79 Disc.: Spacewatch
Alt.: 2009 UU94
MPC · JPL
0 1999 SL21 MBA-I 18.1 710 m multiple 1999–2021 08 Jun 2021 61 Disc.: Spacewatch MPC · JPL
0 1999 SE23 MBA-M 17.09 1.6 km multiple 1999–2021 28 Oct 2021 90 Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2006 DA180
MPC · JPL
0 1999 SR23 MBA-O 16.0 3.5 km multiple 1997–2020 12 Dec 2020 147 Disc.: Mauna Kea Obs.
Alt.: 1997 LR2, 2009 MS7, 2014 QJ165
MPC · JPL
4 1999 SZ23 MBA-M 17.9 1.5 km multiple 1999–2006 28 Apr 2006 14 Disc.: Spacewatch
Alt.: 2006 HX143
MPC · JPL
1 1999 SB25 MCA 18.0 750 m multiple 1999–2020 01 Feb 2020 50 Disc.: CSS
Alt.: 2009 WY15
MPC · JPL
E 1999 SA28 TNO 7.3 154 km single 1 day 17 Sep 1999 6 Disc.: Mauna Kea Obs.
LoUTNOs, plutino?
MPC · JPL
0 1999 SQ28 MBA-I 18.3 650 m multiple 1999–2017 12 Sep 2017 50 Disc.: Spacewatch
Alt.: 2010 VZ223
MPC · JPL
0 1999 SY28 MBA-I 18.09 720 m multiple 1999–2020 13 Jul 2020 96 Disc.: Spacewatch MPC · JPL
0 1999 SZ28 MBA-I 18.1 710 m multiple 1999–2020 15 Oct 2020 90 Disc.: Spacewatch MPC · JPL
0 1999 SA29 MBA-I 18.5 590 m multiple 1999–2019 10 Jan 2019 50 Disc.: Spacewatch MPC · JPL
0 1999 SB29 MBA-I 18.5 590 m multiple 1999–2020 16 Aug 2020 71 Disc.: Spacewatch MPC · JPL
0 1999 SC29 MBA-M 17.29 1.9 km multiple 1999–2021 31 Jul 2021 73 Disc.: Spacewatch MPC · JPL
0 1999 SD29 MBA-O 16.94 2.3 km multiple 1999–2021 30 May 2021 56 Disc.: Spacewatch MPC · JPL
0 1999 SE29 MBA-I 19.0 470 m multiple 1999–2019 27 Oct 2019 37 Disc.: Spacewatch MPC · JPL
0 1999 SF29 MBA-I 17.93 770 m multiple 1999–2021 31 Mar 2021 76 Disc.: Spacewatch MPC · JPL
0 1999 SG29 MBA-I 17.7 860 m multiple 1999–2020 07 Sep 2020 94 Disc.: Spacewatch MPC · JPL
0 1999 SH29 MBA-I 18.4 620 m multiple 1999–2021 06 Jan 2021 99 Disc.: Spacewatch MPC · JPL
0 1999 SJ29 MBA-I 18.1 710 m multiple 1999–2021 05 Jun 2021 75 Disc.: Spacewatch MPC · JPL
1 1999 SK29 HUN 18.9 490 m multiple 1999–2019 31 May 2019 49 Disc.: Spacewatch MPC · JPL
0 1999 SL29 MBA-M 17.70 1.2 km multiple 1999–2021 11 Oct 2021 88 Disc.: Spacewatch MPC · JPL
0 1999 SM29 MBA-I 18.58 570 m multiple 1999–2021 27 Oct 2021 96 Disc.: Spacewatch MPC · JPL
1 1999 SN29 MBA-I 18.4 620 m multiple 1999–2019 22 Aug 2019 43 Disc.: Spacewatch MPC · JPL
0 1999 SO29 MBA-I 18.86 500 m multiple 1999–2021 27 Oct 2021 87 Disc.: Spacewatch MPC · JPL
0 1999 SP29 MBA-M 18.0 1.1 km multiple 1999–2020 13 Sep 2020 32 Disc.: Spacewatch MPC · JPL
0 1999 SQ29 MBA-M 17.81 1.5 km multiple 1999–2021 31 Aug 2021 49 Disc.: Spacewatch
Added on 17 June 2021
MPC · JPL

. . . List of unnumbered minor planets: 1999 S–T . . .

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. . . List of unnumbered minor planets: 1999 S–T . . .

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