List of unnumbered minor planets

The following is a list of unnumbered minor planets in chronological order of their principal provisional designation. Contrary to their numbered counterparts, unnumbered minor planets have a poorly determined orbit due to insufficient observational data. This also includes lost minor planets which have not been observed for many years, or even decades. As of February 2022, the Minor Planet Center (MPC) accounts for 558,491 unnumbered minor planets which represent 48% of the overall minor planet population.[1][lower-alpha 1] Unnumbered minor planets can be further divided into 111,001 single-opposition objects with short observation arcs, prone to mismatch and loss, and 447,490 objects that have been observed multiple times during opposition, when astrometric conditions are most favorable.[1] The JPL Small-Body Database gives a running total of 561,837 unnumbered minor planets.[2][lower-alpha 1]

Breakdown of 1,174,890 small bodies of the Solar System:[1][lower-alpha 1]
  111,001 single-opposition MPs
  447,490 multiple-opposition MPs
  612,011 numbered MPs
  4,388 comets

The tables below contain 112 objects with a principal designation assigned between 1927 and 1993. Additional partial lists cover the period from 1994 to 2004.[lower-alpha 1] Unnumbered minor planets detected after 2004 are not listed due to their large number (see statistics). The orbital uncertainty parameter (U) ranges from low ("0") to very high ("9"). For some single-opposition objects no numeric uncertainty is given ("–" and "E"), latter indicating an estimated, rather than determined orbital eccentricity. Furthermore, a color code is used to indicate a body's basic dynamical classification, with additional information given in columns "class" and "description and notes" (especially for near-Earth objects, Jupiter trojans and distant objects).[1][3][4] If available, mean diameters are taken from the latest NEOWISE publication,[5] or, if not available, estimated based on an object's absolute magnitude and displayed in italics.[6]

In the Minor Planet Circular from July 2018, the MPC announced that changes in their data processing pipeline will enable numberings to occur more frequently. It is stated that the new method will clear the backlog of unnumbered minor planets with an already well-established orbit without changing the criteria for numbering. Previously, this was not possible because of the difficulty of determining who was the discoverer.[7] Despite this announcement, however, the total of unnumbered minor planets has since significantly increased rather than decreased.

Statistics
10,000
20,000
30,000
40,000
50,000
60,000
70,000
1995
2000
2005
2010
2015
2020
Unnumbered minor planets (uMPs) by year of principal designation. As of 29 January 2022 the MPC's orbit database contains 558,491 uMPs. Objects observed on a single opposition (total of 111,001) are displayed with a lighter color than multi-opposition objects (total of 447,490).[1][lower-alpha 1]
  Until 2004: 31,553 uMPs (6%) are listed on this and other partial pages
  Since 2005: 526,935 uMPs (94%) are not listed

1900–1959 · 1960–1969 · 1970–1979 · 1980–1989 · 1990–1993 · 1994 · 1995 · 1996 · 1997 · 1998 · 1999 A–R · 1999 S–T · 1999 U–Y · 2000 A–E · 2000 F–O · 2000 P–R · 2000 S–T · 2000 U–Y · 2001 A–E · 2001 F (i) · 2001 F (ii) · 2001 G–O · 2001 P–R · 2001 S · 2001 T · 2001 U · 2001 V–W · 2001 X–Y · 2002 A–B · 2002 C · 2002 D–F · 2002 G–K · 2002 L–O · 2002 P · 2002 Q (i) · 2002 Q (ii) · 2002 R (i) · 2002 R (ii) · 2002 S · 2002 T (i)

 · 2002 T (ii) · 2002 U–V · 2002 W–Y · 2003 A–E · 2003 F–G · 2003 H–L · 2003 M–R · 2003 S (i) · 2003 S (ii) · 2003 S (iii) · 2003 S (iv) · 2003 T · 2003 U (i) · 2003 U (ii) · 2003 U (iii) · 2003 U (iv) · 2003 V · 2003 W (i) · 2003 W (ii) · 2003 X–Y · 2004 A–B · 2004 C · 2004 D–E · 2004 F · 2004 G–H · 2004 J–O · 2004 P–Q · 2004 R (i) · 2004 R (ii) · 2004 R (iii) · 2004 S · 2004 T (i) · 2004 T (ii) · 2004 T (iii) · 2004 T (iv) · 2004 U–V · 2004 W–X · 2004 Y
Navigation of unnumbered minor planets by year of principal provisional designation until 2004.

1900–1959
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
–1927 LAMBA-O11.035 kmsingle34 days05 Jul 19273Disc.: Heidelberg Obs.
Oldest lost asteroid		MPC · JPL
E1935 UZMCA——single4 days23 Oct 19353Disc.: Uccle Obs.MPC · JPL
–1937 CKMBA-I——single32 days13 Mar 19373Disc.: Uccle Obs.MPC · JPL
–1939 RRMBA-O12.022 kmsingle27 days12 Oct 19393Disc.: Uccle Obs.MPC · JPL
–1942 RHMBA-I13.85.2 kmsingle10 days15 Sep 19423Disc.: Turku Obs.MPC · JPL

1960–1969
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
E4847 P-LMCA20.3260 msingle4 days28 Sep 19607Disc.: Palomar–LeidenMPC · JPL
16331 P-LMBA-I18.5590 mmultiple1960–202101 Dec 202182Disc.: Palomar–LeidenMPC · JPL
16344 P-LAPO20.4300 mmultiple1960–202104 Aug 2021129Disc.: Palomar–Leiden
Potentially hazardous object		MPC · JPL
11960 SB1MCA17.9900 mmultiple1960-202222 Mar 202253Disc.: Palomar Obs.
Alt.: 2017 CT1		MPC · JPL

1970–1979
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
01979 MW5MBA-O16.472.9 kmmultiple1979-202211 Apr 202259Disc.: Siding Spring
Alt.: 2011 HG10		MPC · JPL
91979 XBAPO18.6680 msingle4 days15 Dec 197916Disc.: Siding Spring
Potentially hazardous object		MPC · JPL

1980–1989
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
01981 EN35MBA-I17.49940 mmultiple1981–202101 May 2021151Disc.: Siding Spring
Alt.: 2014 FN21		MPC · JPL
11982 YAAMO18.1850 mmultiple1982–201703 Dec 201768Disc.: Haute-Provence
NEO larger than 1 kilometer
Alt.: 2003 WE42		MPC · JPL
01983 LC = (612012)APO19.45460 mmultiple1983–202108 Nov 2021170Disc.: Palomar Obs.
Potentially hazardous object		MPC · JPL
11983 QCMCA18.1710 mmultiple1983–201724 Dec 201740Disc.: Palomar Obs.MPC · JPL
01984 QL1Asteroid15.64.2 kmmultiple1984–202118 Jan 2021170Disc.: Palomar Obs.
MCA at MPC
Alt.: 2002 XP102, 2013 JS30		MPC · JPL
01986 JEHUN18.65550 mmultiple1986–202112 Dec 2021103Disc.: Spacewatch
Alt.: 2005 UU548		MPC · JPL
01986 NAAMO19.85380 mmultiple1986–202131 Oct 202188Disc.: Palomar Obs.
Alt.: 2013 UU3		MPC · JPL
21988 NEAMO19.1540 mmultiple1988–201517 Oct 201595Disc.: Palomar Obs.MPC · JPL
01988 PF1MCA16.72.5 kmmultiple1988–202118 Jan 2021331Disc.: Palomar Obs.
Alt.: 2009 WD77		MPC · JPL
–1988 RH9MBA-M11.125 kmsingle11 days12 Sep 198815Disc.: La Silla Obs.MPC · JPL
11989 AZAPO19.6430 mmultiple1989–200809 Feb 2008121Disc.: Palomar Obs.MPC · JPL
E1989 FRMBA-O13.511 kmsingle2 days28 Mar 19896Disc.: Kleť Obs.MPC · JPL

1990–1993
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
01990 SM24MBA-O16.363.0 kmmultiple1990–202222 Jan 2022233Disc.: La Silla Obs.
Added on 11 May 2021
Alt.: 2008 GU14		MPC · JPL
81990 UNAPO23.571 msingle15 days06 Nov 199022Disc.: SpacewatchMPC · JPL
31991 BAAPO28.67 msingle0 day18 Jan 19917Disc.: SpacewatchMPC · JPL
01991 GKMCA19.43390 mmultiple1991–202027 May 2020128Disc.: Spacewatch
Alt.: 2020 BE6		MPC · JPL
21991 GOAPO20.0360 mmultiple1991–201503 May 201579Disc.: Kitami Obs.
Potentially hazardous object
Alt.: 1999 HC		MPC · JPL
71991 JRAMO23.474 msingle11 days19 May 199120Disc.: SpacewatchMPC · JPL
01991 PNMBA-O16.922.3 kmmultiple1991–202109 May 202148Disc.: Cerro Tololo Obs.
Added on 30 September 2021		MPC · JPL
11991 PW22MBA-M17.31.0 kmmultiple1991–202015 Dec 202051Disc.: La Silla Obs.
Added on 11 May 2021
Alt.: 2010 CU110		MPC · JPL
21991 RN28MBA-I19.2430 mmultiple1991–201815 Oct 201835Disc.: SpacewatchMPC · JPL
01991 RY42MBA-O16.512.8 kmmultiple1991–202027 Apr 202097Disc.: SpacewatchMPC · JPL
01991 SU3MBA-M17.181.1 kmmultiple1991–202208 Mar 2022230Disc.: Spacewatch
Alt.: 2017 BL95		MPC · JPL
71991 TTAPO26.022 msingle3 days09 Oct 19918Disc.: Spacewatch
AMO at MPC		MPC · JPL
61991 TUAPO28.47 msingle0 day07 Oct 19914Disc.: SpacewatchMPC · JPL
01991 TF3APO19.29490 mmultiple1991–202127 Nov 2021545Disc.: Palomar Obs.MPC · JPL
01991 TT8MBA-M17.481.3 kmmultiple1991–202020 Apr 202083Disc.: SpacewatchMPC · JPL
01991 TY10MBA-M17.11.1 kmmultiple1991–202107 Apr 2021128Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2011 PM15		MPC · JPL
01991 TK16MBA-M17.151.1 kmmultiple1991–202227 Jan 2022191Disc.: Palomar–DSS
Alt.: 2016 XN4		MPC · JPL
01991 TM16MCA17.361.0 kmmultiple1991–202107 Feb 202183Disc.: Palomar–DSS
Added on 22 July 2020
Alt.: 2017 AB3		MPC · JPL
01991 TE17MBA-I18.03740 mmultiple1991–201924 Aug 2019110Disc.: SpacewatchMPC · JPL
–1991 VAAPO26.518 msingle8 days09 Nov 199113Disc.: SpacewatchMPC · JPL
E1991 VDHUN19.5370 msingle2 days06 Nov 19919Disc.: SpacewatchMPC · JPL
01991 VGAPO28.38 mmultiple1991–201701 Jun 201766Disc.: SpacewatchMPC · JPL
01991 VO8MBA-M17.152.1 kmmultiple1991–202108 Apr 2021200Disc.: Spacewatch
Alt.: 2005 VB112		MPC · JPL
81991 XAAPO23.765 msingle12 days15 Dec 19917Disc.: SpacewatchMPC · JPL
11991 XBAMO18.8620 mmultiple1991–201124 Jul 201138Disc.: Palomar Obs.MPC · JPL
71992 DUAPO25.331 msingle3 days29 Feb 199211Disc.: SpacewatchMPC · JPL
01992 DD1MCA18.55580 mmultiple1992–202110 Mar 202190Disc.: Spacewatch
Alt.: 2003 EL1		MPC · JPL
51992 JDAPO25.036 msingle6 days09 May 199223Disc.: Spacewatch
AMO at MPC		MPC · JPL
11992 SWMCA19.9310 mmultiple1992–201909 Apr 201947Disc.: SpacewatchMPC · JPL
–1992 SXMCA20.0300 msingle7 days04 Oct 1992Disc.: SpacewatchMPC · JPL
01992 SZAMO20.01350 mmultiple1992–202128 Nov 202165Disc.: SpacewatchMPC · JPL
01992 SM4MBA-O16.602.7 kmmultiple1992–202021 Apr 202069Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2010 EH143, 2015 DM47		MPC · JPL
01992 SN4MBA-M18.53580 mmultiple1992–202227 Jan 202257Disc.: Spacewatch
Added in 2021		MPC · JPL
01992 SC8MBA-M18.38630 mmultiple1992–202130 Nov 202182Disc.: Spacewatch
Added in December 2021		MPC · JPL
21992 SW11MBA-I17.31.0 kmmultiple1992–202025 Dec 202020Disc.: Spacewatch
Added on 21 August 2021		MPC · JPL
E1992 SZ17MBA-M13.87.3 kmsingle4 days03 Oct 19926Disc.: Palomar Obs.MPC · JPL
01992 SS27MBA-M17.301.0 kmmultiple1992–202106 Nov 2021168Disc.: SpacewatchMPC · JPL
E1992 TY1MBA-O12.815 kmsingle3 days05 Oct 19925Disc.: Kitt Peak Obs.MPC · JPL
–1992 TZ1MBA-I15.52.4 kmsingle4 days05 Oct 19925Disc.: Kitt Peak Obs.MPC · JPL
01992 TJ2MBA-O16.382.9 kmmultiple1992–202127 Oct 2021133Disc.: SpacewatchMPC · JPL
01992 WP10MBA-O16.163.3 kmmultiple1992–202102 Jan 2021146Disc.: SpacewatchMPC · JPL
01992 WQ10MBA-M17.94770 mmultiple1992–202127 Oct 2021156Disc.: SpacewatchMPC · JPL
11992 XAMBA-O17.51.8 kmmultiple1992–201813 Dec 2018156Disc.: Spacewatch
Alt.: 2005 UG242		MPC · JPL
01992 YB3MCA19.06460 mmultiple1992–202106 Jan 202178Disc.: Spacewatch
Alt.: 2006 SJ289		MPC · JPL
41992 YD3APO26.419 msingle0 day27 Dec 199212Disc.: Spacewatch
AMO at MPC		MPC · JPL
71993 BD3AMO26.220 msingle5 days31 Jan 199314Disc.: SpacewatchMPC · JPL
51993 BU3AMO21.5180 msingle33 days03 Mar 199318Disc.: SpacewatchMPC · JPL
01993 BZ9MBA-M17.521.3 kmmultiple1993–202103 Oct 2021144Disc.: Spacewatch
Alt.: 2011 FR39, 2015 BQ428		MPC · JPL
11993 BC10MBA-M18.59570 mmultiple1993–202016 Sep 202050Disc.: Spacewatch
Added on 22 July 2020		MPC · JPL
01993 BK10MBA-I18.61560 mmultiple1993–202104 Jan 202155Disc.: Spacewatch
Alt.: 2006 XR55		MPC · JPL
01993 BF12MBA-I18.65550 mmultiple1993–202206 Jan 2022136Disc.: Spacewatch
Alt.: 2005 YY252		MPC · JPL
01993 BC16JT13.0913 kmmultiple1990–202126 Aug 2021247Disc.: Spacewatch
Trojan camp (L5)		MPC · JPL
01993 BD16JT14.287.8 kmmultiple1993–202111 May 2021179Disc.: Spacewatch
Trojan camp (L5)		MPC · JPL
61993 DAATE26.419 msingle5 days22 Feb 199318Disc.: SpacewatchMPC · JPL
71993 FA1APO25.923 msingle3 days31 Mar 199317Disc.: Spacewatch
AMO at MPC		MPC · JPL
01993 FB85MBA-M17.31.9 kmmultiple1993–202119 Jun 202152Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2002 GO188		MPC · JPL
01993 FE85MBA-M17.781.5 kmmultiple1993–202113 Jul 202164Disc.: Spacewatch
Added on 22 July 2020		MPC · JPL
01993 HCAPO20.77250 mmultiple1993–202107 May 202154Disc.: SpacewatchMPC · JPL
31993 HP1APO27.114 msingle0 day27 Apr 199327Disc.: SpacewatchMPC · JPL
01993 HF2MBA-M17.801.2 kmmultiple1993–202026 Sep 202070Disc.: Spacewatch
Added on 22 July 2020		MPC · JPL
–1993 KAAPO26.022 msingle9 days26 May 199321Disc.: Spacewatch
AMO at MPC		MPC · JPL
–1993 KA2APO29.06 msingle1 day22 May 199310Disc.: SpacewatchMPC · JPL
11993 ME1MCA16.81.8 kmmultiple1993–202010 Dec 2020136Disc.: Palomar Obs.MPC · JPL
–1993 OTMCA19.0470 msingle20 days13 Aug 19939Disc.: SpacewatchMPC · JPL
01993 OM1MBA-M17.51.3 kmmultiple1993–202227 Jan 202251Disc.: Spacewatch
Alt.: 2015 MT193		MPC · JPL
01993 OW5MBA-M17.21.1 kmmultiple1993–201808 Nov 2018122Disc.: La Silla Obs.MPC · JPL
01993 OP9MBA-I17.80820 mmultiple1993–202128 Jul 2021113Disc.: La Silla Obs.
Alt.: 2004 TH237		MPC · JPL
01993 PA1MBA-I18.71540 mmultiple1993–202118 Apr 202136Disc.: Spacewatch
Alt.: 2009 QA32		MPC · JPL
21993 PK1MBA-I18.6570 mmultiple1993–201923 Sep 201937Disc.: SpacewatchMPC · JPL
E1993 RPTNO9.075 kmsingle2 days17 Sep 19936Disc.: Mauna Kea Obs.
LoUTNOs, plutino?		MPC · JPL
01993 SZ16MBA-O16.33.1 kmmultiple1993–202126 Oct 2021115Disc.: SpacewatchMPC · JPL
11993 TZAPO26.022 mmultiple1993–201614 Oct 201634Disc.: SpacewatchMPC · JPL
–1993 TR2MCA20.4350 msingle12 days24 Oct 199315Disc.: SpacewatchMPC · JPL
21993 TK4MBA-M18.7760 mmultiple1993–202019 Jan 202042Alt.: 2019 SY43MPC · JPL
21993 TQ4MBA-I17.9780 mmultiple1993–202015 May 202039Disc.: Spacewatch
Added on 22 July 2020		MPC · JPL
01993 TL6MBA-I18.28660 mmultiple1993–202018 Oct 202072Disc.: Spacewatch
Alt.: 2005 YB104		MPC · JPL
01993 TC11MBA-M19.3410 mmultiple1993–201907 Jan 201943Disc.: SpacewatchMPC · JPL
–1993 TS35MBA-M16.52.1 kmsingle11 days20 Oct 1993Disc.: La Silla Obs.MPC · JPL
61993 UAAPO25.430 msingle3 days24 Oct 199315Disc.: SpacewatchMPC · JPL
21993 UDAMO20.0360 mmultiple1993–202001 Mar 202068Disc.: SpacewatchMPC · JPL
01993 UH10MBA-M17.272.0 kmmultiple1993–202130 Nov 2021138Disc.: SpacewatchMPC · JPL
11993 VCMCA20.5440 mmultiple1993–200711 Nov 200734Disc.: SpacewatchMPC · JPL
01993 VD6MBA-I18.49600 mmultiple1993–202113 Feb 202164Disc.: SpacewatchMPC · JPL
01993 VE6MBA-I19.20430 mmultiple1993–202005 Nov 202039Disc.: Spacewatch
Added on 11 May 2021
Alt.: 2003 SE413		MPC · JPL
01993 VG6MBA-O16.822.4 kmmultiple1993–202024 Dec 202085Disc.: SpacewatchMPC · JPL
01993 VQ6MBA-O17.002.2 kmmultiple1993–202108 Dec 202167Alt.: 2015 RE311MPC · JPL
–1993 VT6MBA-M17.21.1 kmsingle17 days10 Nov 19939Disc.: SpacewatchMPC · JPL
01993 WGMBA-M17.71.2 kmmultiple1993–202022 Mar 202092Disc.: Spacewatch
Alt.: 2010 TZ5		MPC · JPL
01993 XN3MBA-I18.09720 mmultiple1993–202103 Aug 2021118Disc.: SpacewatchMPC · JPL

1994–2004
2001
2002
2003
2004

2005–present

The year of principal provisional designation for most unnumbered minor planets is younger than 2004 (see § Statistics). They are not listed in any of the partial lists due to their large number and frequent changes. New partial lists may be created in the future, as additional observations ultimately lead to new numberings and to fewer unnumbered bodies.

See also

Notes
  1. The data for this and other partial lists is sourced from the Minor Planet Center's orbit-database file (MPCORB.DAT). The number of entries typically differs from the summary figures published on the JPL and MPC web pages, as they may lag behind days, weeks, or even months. This includes MPC's "Latest Published Data" and "Archive Statistics – Orbits And Names".[lower-alpha 2][lower-alpha 3]

References
  1. "Data Available from the Minor Planet Center – MPCORB.DAT". Minor Planet Center. 29 January 2022. (doc)
  2. "How Many Solar System Bodies". Jet Propulsion Laboratory – Small-Body Database. Retrieved 3 February 2022.
  3. "List Of Jupiter Trojans". Minor Planet Center. 26 January 2021.
  4. Johnston, Wm. Robert (2 January 2022). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2 February 2022.
  5. "NEOWISE Diameters and Albedos – V2.0". PDS Small Bodies Node. 2019.
  6. "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 13 May 2021.
  7. "Minor Planet Circular (MPC 110641-111804) – Editorial Notice" (PDF). Minor Planet Center. 25 September 2018. Retrieved 22 February 2019.
  8. "Latest Published Data". Minor Planet Center. 12 January 2022. Retrieved 2 February 2022.
  9. "MPC Archive Statistics – Orbits And Names". Minor Planet Center. 18 May 2019. Retrieved 2 February 2022.
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