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 August 2023, the Minor Planet Center (MPC) accounts for 676,755 unnumbered minor planets which represent 52% of the overall minor planet population.[1][lower-alpha 1] Unnumbered minor planets can be further divided into 129,103 single-opposition objects with short observation arcs, prone to mismatch and loss, and 547,652 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 676,786 unnumbered minor planets.[2][lower-alpha 1]

Breakdown of 1,304,970 small bodies of the Solar System:[1][lower-alpha 1]
  129,103 single-opposition MPs
  547,652 multiple-opposition MPs
  623,827 numbered MPs
  4,586 comets

The tables below contain 111 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

1900–1979 · 1980–1989 · 1990–1992 · 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.

1900–1979
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
04847 P-LMBA-I18.04730 mmultiple1960-202225 Jan 202234Disc.: Palomar–LeidenMPC · JPL
16331 P-LMBA-I18.5590 mmultiple1960–202101 Dec 202181Disc.: Palomar–LeidenMPC · JPL
16344 P-LAPO20.4300 mmultiple1960–202104 Aug 2021129Disc.: Palomar–Leiden
Potentially hazardous object		MPC · JPL
11960 SB1MCA17.911.5 kmmultiple1960-202222 Mar 202256Disc.: Palomar Obs.
Alt.: 2017 CT1		MPC · JPL
01979 MW5MBA-O16.492.8 kmmultiple1979-202307 Sep 202388Disc.: 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-I17.46960 mmultiple1981–202218 Sep 2022188Disc.: Siding Spring
Alt.: 2014 FN21		MPC · JPL
01982 YAAMO18.01890 mmultiple1982–201703 Dec 201771Disc.: Haute-Provence
NEO larger than 1 kilometer
Alt.: 2003 WE42		MPC · JPL
11983 QCMCA18.11.0 kmmultiple1983–201724 Dec 201740Disc.: Palomar Obs.MPC · JPL
01984 QL1MCA15.83.9 kmmultiple1984–202230 Jan 2022167Disc.: Palomar Obs.
MBA-O at JPL
Alt.: 2002 XP102, 2013 JS30		MPC · JPL
01986 JEHUN18.65550 mmultiple1986–202219 Feb 2022107Disc.: Spacewatch
Alt.: 2005 UU548		MPC · JPL
01986 NAAMO19.85380 mmultiple1986–202131 Oct 202188Disc.: Palomar Obs.
Alt.: 2013 UU3		MPC · JPL
01988 NEAMO19.25500 mmultiple1988–202217 Sep 202295Disc.: 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
01989 AZAPO19.68410 mmultiple1989–202327 Mar 2023125Disc.: Palomar Obs.MPC · JPL
E1989 FRMBA-O13.511 kmsingle2 days28 Mar 19896Disc.: Kleť Obs.MPC · JPL

1990–1992
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
21990 HY6MBA-O17.751.6 kmmultiple1990–202219 Nov 202242Disc.: Siding Spring
Alt.: 2012 XV90		MPC · JPL
01990 SM24MBA-O16.363.0 kmmultiple1990–202316 Apr 2023262Disc.: La Silla Obs.
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
01991 GOAPO20.1340 mmultiple1991–202310 Jun 202394Disc.: Kitami Obs.
Potentially hazardous object
Alt.: 1999 HC		MPC · JPL
71991 JRAMO23.471 msingle11 days19 May 199120Disc.: SpacewatchMPC · JPL
01991 PNMBA-O16.912.3 kmmultiple1991–202308 Sep 202355Disc.: Cerro Tololo Obs.MPC · JPL
01991 PW22MBA-M17.451.4 kmmultiple1991–202315 Jun 202276Disc.: La Silla Obs.
Alt.: 2010 CU110		MPC · JPL
21991 RN28MBA-I19.2430 mmultiple1991–201815 Oct 201835Disc.: SpacewatchMPC · JPL
01991 RY42MBA-O16.492.8 kmmultiple1991–202224 Nov 2022154Disc.: SpacewatchMPC · JPL
01991 SU3MBA-M17.21.5 kmmultiple1991–202203 May 2022263Disc.: 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 TT8MBA-M17.431.4 kmmultiple1991–202224 Dec 202298Disc.: SpacewatchMPC · JPL
01991 TY10MBA-M17.11.6 kmmultiple1991–202107 Apr 2021128Disc.: Spacewatch
Alt.: 2011 PM15		MPC · JPL
01991 TK16MBA-M17.111.6 kmmultiple1991–202317 Jun 2023226Disc.: Palomar–DSS
Alt.: 2016 XN4		MPC · JPL
01991 TM16MCA17.361.4 kmmultiple1991–202107 Feb 202183Disc.: Palomar–DSS
Alt.: 2017 AB3		MPC · JPL
01991 TE17MBA-I18.11710 mmultiple1991–202301 Jul 2023142Disc.: 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
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
51992 JDAPO25.036 msingle6 days09 May 199223Disc.: Spacewatch
AMO at MPC		MPC · JPL
01992 SWMCA19.98300 mmultiple1992–201909 Apr 201951Disc.: SpacewatchMPC · JPL
–1992 SXMCA20.0300 msingle7 days04 Oct 199214Disc.: SpacewatchMPC · JPL
01992 SZAMO20.01350 mmultiple1992–202128 Nov 202165Disc.: SpacewatchMPC · JPL
01992 SM4MBA-O16.572.7 kmmultiple1992–202216 Nov 202296Disc.: Spacewatch
Alt.: 2010 EH143, 2015 DM47		MPC · JPL
01992 SN4MBA-M18.55820 mmultiple1992–202227 Jan 202265Disc.: SpacewatchMPC · JPL
01992 SC8MBA-M18.38890 mmultiple1992–202130 Nov 202182Disc.: Spacewatch
Alt.: 2017 WV33		MPC · JPL
21992 SW11MBA-I17.31.0 kmmultiple1992–202025 Dec 202020Disc.: SpacewatchMPC · JPL
21992 SB12MBA-I18.9490 mmultiple1992–202207 Jan 202229Disc.: Spacewatch
Alt.: 2017 SW186		MPC · JPL
E1992 SZ17MBA-M13.87.3 kmsingle4 days03 Oct 19926Disc.: Palomar Obs.MPC · JPL
01992 SS27MBA-M17.321.4 kmmultiple1992–202316 Mar 2023184Disc.: 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-O16.42.9 kmmultiple1992–202216 Dec 2022148Disc.: SpacewatchMPC · JPL
01992 WP10MBA-O16.173.2 kmmultiple1992–202314 Apr 2023171Disc.: SpacewatchMPC · JPL
01992 WQ10MBA-M17.931.1 kmmultiple1992–202316 Mar 2023161Disc.: SpacewatchMPC · JPL
11992 XAMBA-O17.51.8 kmmultiple1992–201813 Dec 2018161Disc.: Spacewatch
Alt.: 2005 UG242		MPC · JPL
41992 YD3APO26.419 msingle0 day27 Dec 199212Disc.: Spacewatch
AMO at MPC		MPC · JPL

1993
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
71993 BD3AMO26.220 msingle5 days31 Jan 199314Disc.: SpacewatchMPC · JPL
71993 BU3AMO21.17210 msingle33 days03 Mar 199318Disc.: SpacewatchMPC · JPL
01993 BZ9MBA-M17.531.3 kmmultiple1993–202217 Dec 2022161Disc.: Spacewatch
Alt.: 2011 FR39, 2015 BQ428		MPC · JPL
11993 BC10MBA-M18.59800 mmultiple1993–202016 Sep 202050Disc.: SpacewatchMPC · JPL
01993 BK10MBA-I18.61560 mmultiple1993–202104 Jan 202155Disc.: Spacewatch
Alt.: 2006 XR55		MPC · JPL
01993 BF12MBA-I18.64560 mmultiple1993–202318 May 2023140Disc.: Spacewatch
Alt.: 2005 YY252		MPC · JPL
01993 BC16JT13.1313 kmmultiple1990–202314 Sep 2023294Disc.: Spacewatch
Trojan camp (L5)		MPC · JPL
01993 BD16JT14.267.8 kmmultiple1993–202314 Sep 2023194Disc.: 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-M17.61.3 kmmultiple1993–202229 Oct 202264Disc.: Spacewatch
Alt.: 2002 GO188		MPC · JPL
01993 FE85MBA-M17.691.2 kmmultiple1993–202229 Nov 2022101Disc.: SpacewatchMPC · JPL
01993 HCAPO20.77250 mmultiple1993–202107 May 202158Disc.: SpacewatchMPC · JPL
31993 HP1APO27.114 msingle0 day27 Apr 199327Disc.: SpacewatchMPC · JPL
01993 HF2MBA-M17.811.2 kmmultiple1993–202329 Apr 202370Disc.: SpacewatchMPC · JPL
–1993 KAAPO26.022 msingle9 days26 May 199321Disc.: Spacewatch
AMO at MPC		MPC · JPL
91993 KA2APO29.06 msingle1 day22 May 199314Disc.: SpacewatchMPC · JPL
01993 ME1MCA16.891.8 kmmultiple1993–202326 Jul 2023244Disc.: Palomar Obs.MPC · JPL
–1993 OTMCA19.0470 msingle20 days13 Aug 19939Disc.: SpacewatchMPC · JPL
01993 OM1MBA-M17.541.3 kmmultiple1993–202324 Apr 202359Disc.: Spacewatch
Alt.: 2015 MT193		MPC · JPL
01993 OW5MBA-M17.331.4 kmmultiple1993–202228 Oct 2022252Disc.: La Silla Obs.MPC · JPL
01993 OP9MBA-I17.82810 mmultiple1993–202224 Dec 2022124Disc.: La Silla Obs.
Alt.: 2004 TH237		MPC · JPL
11993 OY13MBA-I18.84510 mmultiple1993–202219 Nov 202235Disc.: SpacewatchMPC · JPL
01993 PA1MBA-I18.73530 mmultiple1993–202313 Jan 202360Disc.: Spacewatch
Alt.: 2009 QA32		MPC · JPL
01993 PK1MBA-I18.87510 mmultiple1993–202322 Oct 202369Disc.: SpacewatchMPC · JPL
31993 RPTNO9.3759 kmmultiple1993-201602 Nov 201637Disc.: Mauna Kea Obs.
LoUTNOs, res · 4:5
Alt.: 2015 VR202		MPC · JPL
01993 SZ16MBA-O16.442.9 kmmultiple1993–202323 Jan 2023171Disc.: SpacewatchMPC · JPL
11993 TZAPO26.022 mmultiple1993–201614 Oct 201634Disc.: SpacewatchMPC · JPL
–1993 TR2MCA20.4350 msingle12 days24 Oct 199315Disc.: SpacewatchMPC · JPL
01993 TK4MBA-M18.8740 mmultiple1993–202303 Sep 202346Disc.: Spacewatch
Alt.: 2019 SY43		MPC · JPL
01993 TQ4MBA-I18.06730 mmultiple1993–202316 Apr 202345Disc.: SpacewatchMPC · JPL
01993 TP6MBA-I19.2430 mmultiple1993–202227 Nov 202279Disc.: SpacewatchMPC · JPL
01993 TL8MBA-M17.371.4 kmmultiple1993–202107 Nov 202186Disc.: Spacewatch
Alt.: 2012 UH179		MPC · JPL
01993 TC11MBA-M19.45540 mmultiple1993–202229 Oct 202278Disc.: SpacewatchMPC · JPL
01993 TC45MBA-M17.951.1 kmmultiple1993–202313 Jan 2023200Disc.: La Silla Obs.
Alt.: 2007 BY108		MPC · JPL
61993 UAAPO25.430 msingle3 days24 Oct 199315Disc.: SpacewatchMPC · JPL
01993 UDAMO20.38300 mmultiple1993–202215 Dec 202268Disc.: SpacewatchMPC · JPL
01993 UY7MCA18.75530 mmultiple1993-202223 Oct 202252Disc.: Spacewatch
Alt.: 2015 XV465		MPC · JPL
01993 UH10MBA-M17.231.5 kmmultiple1993–202328 Mar 2023160Disc.: SpacewatchMPC · JPL
11993 VCMCA20.5330 mmultiple1993–200711 Nov 200734Disc.: SpacewatchMPC · JPL
01993 VD6MBA-I18.53580 mmultiple1993–202201 Jun 202299Disc.: SpacewatchMPC · JPL
01993 VE6MBA-I19.16440 mmultiple1993–202207 Apr 202249Disc.: Spacewatch
Alt.: 2003 SE413		MPC · JPL
01993 VG6MBA-O16.872.4 kmmultiple1993–202317 Jun 202398Disc.: SpacewatchMPC · JPL
01993 VQ6MBA-O16.962.3 kmmultiple1993–202317 Apr 202394Disc.: Spacewatch
Alt.: 2015 RE311		MPC · JPL
01993 VT6MBA-M17.161.6 kmmultiple1993-202303 Feb 2023128Disc.: SpacewatchMPC · JPL
01993 XN3MBA-I18.09720 mmultiple1993–202320 Feb 2023135Disc.: 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 14 August 2023.
  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 14 August 2023.
  9. "MPC Archive Statistics – Orbits And Names". Minor Planet Center. 18 May 2019. Retrieved 14 August 2023.
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