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 January 2021, the Minor Planet Center (MPC) accounts for 498,491 unnumbered minor planets which represent 48% of the overall minor planet population.[1][lower-alpha 1] Unnumbered minor planets can be further divided into 96,384 single-opposition objects with short observation arcs, prone to mismatch and loss, and 402,107 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 497,883 unnumbered minor planets.[2]

Unnumbered minor planets (single-opposition): 96,384 bodies (9.2%)Unnumbered minor planets (multiple-opposition): 402,107 bodies (38.3%)Numbered minor planets: 546,846 bodies (52.1%)Comets: 4,360 bodies (0.4%)

Breakdown of 1,049,697 small bodies of the Solar System:[1][lower-alpha 1]
  96,384 single-opposition MPs
  402,107 multiple-opposition MPs
  546,846 numbered MPs
  4,360 comets

The tables below contain 105 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 17 January 2021 the MPC's orbit database contains 498,491 uMPs. Objects observed on a single opposition (total of 96,384) are displayed with a lighter color than multi-opposition objects (total of 402,107).[1][lower-alpha 1]
  Until 2004: 35,702 uMPs (7%) are listed on this and other partial pages
  Since 2005: 462,787 uMPs (93%) 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.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
–4847 P-LMBA-M17.4980 msingle4 days28 Sep 19607Disc.: Palomar–LeidenMPC · JPL
16331 P-LMBA-I18.5590 mmultiple1960–201707 Nov 201779Disc.: Palomar–LeidenMPC · JPL
06344 P-LAPO20.4300 mmultiple1960–200803 Feb 2008114Disc.: Palomar–Leiden
Potentially hazardous object		MPC · JPL
E1960 SB1MCA17.41.8 kmsingle4 days28 Sep 19606Disc.: Palomar Obs.MPC · JPL

1970–1979
U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
E1979 MW5MBA-O16.03.5 kmsingle5 days29 Jun 19793Disc.: Siding SpringMPC · 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
–1981 EG6MBA-O17.31.9 kmsingle38 days12 Mar 19815Disc.: Siding SpringMPC · JPL
01981 EN35MBA-I17.31.0 kmmultiple1981–202111 Jan 2021150Disc.: Siding Spring
Alt.: 2014 FN21		MPC · JPL
61981 EO47MBA-M15.03.0 kmsingle60 days01 May 19814Disc.: Siding SpringMPC · JPL
11982 YAAMO18.1850 mmultiple1982–201703 Dec 201768Disc.: Haute-Provence
NEO larger than 1 kilometer
Alt.: 2003 WE42		MPC · JPL
01983 LCAPO19.3490 mmultiple1983–200411 Dec 200468Disc.: Palomar Obs.
Potentially hazardous object		MPC · JPL
11983 QCMCA18.1710 mmultiple1983–201724 Dec 201734Disc.: Palomar Obs.
Alt.: 1957 OC1		MPC · JPL
01984 QL1Asteroid15.64.2 kmmultiple1984–202023 Dec 2020166Disc.: Palomar Obs.
MCA at MPC
Alt.: 2002 XP102, 2013 JS30		MPC · JPL
–1986 JEHUN18.0750 msingle33 days11 Jun 1986Disc.: SpacewatchMPC · JPL
21986 NAAMO19.8390 mmultiple1986–201322 Dec 201330Disc.: Palomar Obs.
Alt.: 2013 UU3		MPC · JPL
21988 NEAMO19.1540 mmultiple1988–201517 Oct 201595Disc.: Palomar Obs.MPC · JPL
01988 PF1MCA16.72.5 kmmultiple1988–202003 Feb 2020327Disc.: 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
81990 UNAPO23.571 msingle15 days06 Nov 199022Disc.: SpacewatchMPC · JPL
31991 BAAPO28.67 msingle0 day18 Jan 19917Disc.: SpacewatchMPC · JPL
11991 GKMCA19.4390 mmultiple1991-202027 May 2020130Disc.: Spacewatch Alt.: 2020 BE6MPC · 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
21991 RN28MBA-I19.2430 mmultiple1991–201815 Oct 201835Disc.: SpacewatchMPC · JPL
01991 RY42MBA-O16.33.1 kmmultiple1991–202027 Apr 202085Disc.: SpacewatchMPC · JPL
01991 SU3MBA-M17.01.2 kmmultiple1991–202111 Jan 2021198Disc.: 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
11991 TF3APO19.2510 mmultiple1991–201101 Nov 2011227Disc.: Palomar Obs.MPC · JPL
01991 TT8MBA-M17.21.5 kmmultiple1991–202020 Apr 202088Disc.: SpacewatchMPC · JPL
01991 TY10MBA-M17.21.1 kmmultiple1991–202114 Jan 2021100Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2011 PM15		MPC · JPL
01991 TK16MBA-M17.01.2 kmmultiple1991–202108 Jan 2021193Disc.: Palomar–DSS
Alt.: 2016 XN4		MPC · JPL
11991 TM16MCA17.21.1 kmmultiple1991–202115 Jan 202172Disc.: Palomar–DSS
Added on 22 July 2020
Alt.: 2017 AB3		MPC · JPL
01991 TD17MBA-M16.91.2 kmmultiple1991–202110 Jan 2021205Disc.: SpacewatchMPC · JPL
01991 TE17MBA-I17.8820 mmultiple1991–201924 Aug 2019112Disc.: 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-M16.92.3 kmmultiple1991–202020 Jan 202087Disc.: 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
11992 DD1MCA18.3650 mmultiple1992–202116 Jan 202188Disc.: 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 199214Disc.: SpacewatchMPC · JPL
51992 SZAMO20.1340 msingle99 days29 Nov 199226Disc.: SpacewatchMPC · JPL
11992 SM4MBA-O16.42.9 kmmultiple1992–202021 Apr 202071Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2010 EH143, 2015 DM47		MPC · JPL
E1992 SZ17MBA-M13.87.3 kmsingle4 days03 Oct 19926Disc.: Palomar Obs.MPC · JPL
01992 SS27MBA-M17.21.1 kmmultiple1992–202018 Jul 2020106Disc.: 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-O16.23.2 kmmultiple1992–201925 Apr 2019103Disc.: SpacewatchMPC · JPL
01992 WP10MBA-O15.93.7 kmmultiple1992–202102 Jan 2021151Disc.: SpacewatchMPC · JPL
01992 WQ10MBA-M17.8820 mmultiple1992–202020 May 202095Disc.: SpacewatchMPC · JPL
11992 XAMBA-O17.51.8 kmmultiple1992–201813 Dec 2018156Disc.: Spacewatch
Alt.: 2005 UG242		MPC · JPL
11992 YB3MCA18.8520 mmultiple1992–202106 Jan 202183Disc.: 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-M17.31.5 kmmultiple1993–202021 Jun 2020136Disc.: Spacewatch
Alt.: 2011 FR39, 2015 BQ428		MPC · JPL
21993 BC10MBA-M18.4620 mmultiple1993–202016 Sep 202051Disc.: Spacewatch
Added on 22 July 2020		MPC · JPL
01993 BK10MBA-I18.4620 mmultiple1993–202104 Jan 202158Disc.: Spacewatch
Alt.: 2006 XR55		MPC · JPL
01993 BM10MBA-O17.12.1 kmmultiple1993–202023 Oct 202089Disc.: SpacewatchMPC · JPL
01993 BF12MBA-I18.5590 mmultiple1993–201909 Jan 201983Disc.: SpacewatchMPC · JPL
01993 BC16JT13.014 kmmultiple1990–202021 Jul 2020208Disc.: Spacewatch
Trojan camp (L5)		MPC · JPL
01993 BD16JT14.18.4 kmmultiple1993–202024 Jun 202098Disc.: 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-M17.41.8 kmmultiple1993–202027 Apr 202048Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2002 GO188		MPC · JPL
01993 FE85MBA-M17.51.8 kmmultiple1993–202013 May 202063Disc.: Spacewatch
Added on 22 July 2020		MPC · JPL
01993 HCAPO20.74250 mmultiple1993–202113 Jan 202144Disc.: SpacewatchMPC · JPL
31993 HP1APO27.114 msingle0 day27 Apr 199327Disc.: SpacewatchMPC · JPL
01993 HF2MBA-M17.51.3 kmmultiple1993–202026 Sep 202056Disc.: 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
–1993 OM1MBA-M17.51.3 kmsingle20 days13 Aug 19939Disc.: SpacewatchMPC · JPL
01993 OW5MBA-M17.21.1 kmmultiple1993–201808 Nov 2018122Disc.: La Silla Obs.MPC · JPL
11993 OP9MBA-I17.7860 mmultiple1993–201813 Nov 201881Disc.: La Silla Obs.
Alt.: 2004 TH237		MPC · JPL
11993 PA1MBA-I18.7540 mmultiple1993–201726 Jan 201734Disc.: Spacewatch
Alt.: 2009 QA32		MPC · JPL
21993 PK1MBA-I18.6570 mmultiple1993–201923 Sep 201937Disc.: SpacewatchMPC · JPL
E1993 RPTNO9.070 kmsingle2 days17 Sep 19936Disc.: Mauna Kea Obs.
LoUTNOs, plutino?		MPC · JPL
01993 RG21MBA-O15.83.9 kmmultiple1993–202022 Oct 2020122Disc.: SpacewatchMPC · JPL
01993 SZ16MBA-O16.23.2 kmmultiple1993–201909 Apr 201978Disc.: SpacewatchMPC · JPL
11993 TZAPO26.022 mmultiple1993–201614 Oct 201634Disc.: SpacewatchMPC · JPL
–1993 TR2MCA20.4350 msingle12 days24 Oct 199315Disc.: SpacewatchMPC · JPL
21993 TQ4MBA-I17.9780 mmultiple1993–202015 May 202039Disc.: Spacewatch
Added on 22 July 2020		MPC · JPL
01993 TL6MBA-I18.1710 mmultiple1993–202018 Oct 202075Disc.: Spacewatch
Alt.: 2005 YB104		MPC · JPL
01993 TC11MBA-M19.3410 mmultiple1993–201907 Jan 201943Disc.: SpacewatchMPC · JPL
–1993 TS35MBA-M16.52.1 kmsingle11 days20 Oct 199312Disc.: 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-M17.02.2 kmmultiple1993–201909 Apr 201988Disc.: SpacewatchMPC · JPL
11993 VCMCA20.5440 mmultiple1993–200711 Nov 200734Disc.: SpacewatchMPC · JPL
11993 VD6MBA-I18.3650 mmultiple1993–202109 Jan 202160Disc.: SpacewatchMPC · JPL
01993 VG6MBA-O16.62.7 kmmultiple1993–202024 Dec 202090Disc.: SpacewatchMPC · JPL
01993 VQ6MBA-O16.82.4 kmmultiple1993–202016 Sep 202054Alt.: 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-I17.9780 mmultiple1993–202019 Apr 2020107Disc.: 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. 17 January 2021. Retrieved 20 January 2021. (doc)
  2. "How Many Solar System Bodies". Jet Propulsion Laboratory – Small-Body Database. Retrieved 20 January 2021.
  3. "List Of Jupiter Trojans". Minor Planet Center. 8 December 2020. Retrieved 20 January 2021.
  4. Johnston, Wm. Robert (18 August 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 20 January 2021.
  5. "NEOWISE Diameters and Albedos – V2.0". PDS Small Bodies Node. 2019. Retrieved 20 January 2021.
  6. "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 20 January 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. 24 September 2020. Retrieved 20 January 2021.
  9. "MPC Archive Statistics – Orbits And Names". Minor Planet Center. 18 May 2019. Retrieved 20 January 2021.
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