List of unnumbered minor planets

Last updated
Circle frame.svgUnnumbered minor planets (single-opposition): 129,103 bodies (9.9%)Unnumbered minor planets (multiple-opposition): 547,652 bodies (42.0%)Numbered minor planets: 623,827 bodies (47.8%)Comets: 4,586 bodies (0.4%)
Breakdown of 1,304,970 small bodies of the Solar System: [1] [a]
  129,103 single-opposition MPs
  547,652 multiple-opposition MPs
  623,827 numbered MPs
  4,586 comets

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

Contents

The tables below contain 128 objects with a principal designation assigned between 1927 and 1994. Additional partial lists cover the period from 1995 to 2004. [a] Unnumbered minor planets detected after 2004 are not listed due to their large number. The orbital uncertainty parameter (U) ranges from low ("0") to very high ("9"). For some single-opposition objects no numeric uncertainty is given ("–"), with "E" 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] [a]
  Until 2004: 31,553 uMPs (6%) are listed on this and other partial pages
  Since 2005: 526,935 uMPs (94%) are not listed

Legend

   Near-Earth obj.      MBA (inner)    MBA (outer)    Centaur
   Mars-crosser    MBA (middle)      Jupiter trojan     Trans-Neptunian obj.
  Unclassified

1900–1979

U Designation Class Physical Observations Description and notesRef
H D Opp. Arc LastUsed
– 1927 LA MBA-O11.035 kmsingle34 days05 Jul 19273Disc.: Heidelberg Obs.
Oldest lost asteroid 		MPC  · JPL
E 1935 UZ MCA ——single4 days23 Oct 19353Disc.: Uccle Obs. MPC  · JPL
– 1937 CK MBA-I——single32 days13 Mar 19373Disc.: Uccle Obs. MPC  · JPL
– 1939 RR MBA-O12.022 kmsingle27 days12 Oct 19393Disc.: Uccle Obs. MPC  · JPL
– 1942 RH MBA-I13.85.2 kmsingle10 days15 Sep 19423Disc.: Turku Obs. MPC  · JPL
0 4847 P-L MBA-I18.18730 mmultiple1960-202406 Oct 202472Disc.: Palomar–Leiden MPC  · JPL
0 6331 P-L MBA-I18.61590 mmultiple1960–202416 Jun 202490Disc.: Palomar–Leiden MPC  · JPL
0 6344 P-L APO 20.4300 mmultiple1960–202104 Aug 2021129Disc.: Palomar–Leiden
Potentially hazardous object 		MPC  · JPL
1 1960 SB1 MCA 17.911.5 kmmultiple1960-202222 Mar 202256Disc.: Palomar Obs.
Alt.: 2017 CT1		 MPC  · JPL
9 1979 XB APO 18.6680 msingle4 days15 Dec 197916Disc.: Siding Spring
Potentially hazardous object 		MPC  · JPL
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1980–1989

U Designation Class Physical Observations Description and notesRef
H D Opp. Arc LastUsed
0 1982 YA AMO 18.091 kmmultiple1982–202506 Jan 202581Disc.: Haute-Provence
NEO larger than 1 kilometer
Alt.: 2003 WE42		 MPC  · JPL
0 1983 QC MCA 18.83600 mmultiple1983–201811 Mar 201842Disc.: Palomar Obs. MPC  · JPL
0 1986 NA AMO 19.85380 mmultiple1986–202131 Oct 202188Disc.: Palomar Obs.
Alt.: 2013 UU3		 MPC  · JPL
0 1988 NE AMO19.22500 mmultiple1988–202502 Apr 2025112Disc.: Palomar Obs. MPC  · JPL
0 1988 PF1 MCA 16.72.5 kmmultiple1988–202118 Jan 2021331Disc.: Palomar Obs.
Alt.: 2009 WD77		 MPC  · JPL
– 1988 RH9 MBA-M11.125 kmsingle11 days12 Sep 198815Disc.: La Silla Obs. MPC  · JPL
E 1989 FR MBA-O13.511 kmsingle2 days28 Mar 19896Disc.: Kleť Obs. MPC  · JPL
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1990–1992

U Designation Class Physical Observations Description and notesRef
H D Opp. Arc LastUsed
2 1990 HY6 MBA-O17.751.6 kmmultiple1990–202219 Nov 202242Disc.: Siding Spring
Alt.: 2012 XV90		 MPC  · JPL
8 1990 UN APO 23.571 msingle15 days06 Nov 199022Disc.: Spacewatch MPC  · JPL
3 1991 BA APO28.67 msingle0 day18 Jan 19917Disc.: Spacewatch MPC  · JPL
0 1991 GK MCA 19.43390 mmultiple1991–202027 May 2020128Disc.: Spacewatch
Alt.: 2020 BE6		 MPC  · JPL
0 1991 GO APO 20.1340 mmultiple1991–202310 Jun 202394Disc.: Kitami Obs.
Potentially hazardous object
Alt.: 1999 HC		 MPC  · JPL
7 1991 JR AMO 23.471 msingle11 days19 May 199120Disc.: Spacewatch MPC  · JPL
2 1991 RN28 MBA-I19.2430 mmultiple1991–201815 Oct 201835Disc.: Spacewatch MPC  · JPL
7 1991 TT APO 26.022 msingle3 days09 Oct 19918Disc.: Spacewatch
AMO at MPC		 MPC  · JPL
6 1991 TU APO28.47 msingle0 day07 Oct 19914Disc.: Spacewatch MPC  · JPL
– 1991 VA APO 26.518 msingle8 days09 Nov 199113Disc.: Spacewatch MPC  · JPL
E 1991 VD HUN 19.5370 msingle2 days06 Nov 19919Disc.: Spacewatch MPC  · JPL
0 1991 VG APO 28.38 mmultiple1991–201701 Jun 201766Disc.: Spacewatch MPC  · JPL
8 1991 XA APO 23.765 msingle12 days15 Dec 19917Disc.: Spacewatch MPC  · JPL
1 1991 XB AMO 18.8620 mmultiple1991–201124 Jul 201138Disc.: Palomar Obs. MPC  · JPL
7 1992 DU APO 25.331 msingle3 days29 Feb 199211Disc.: Spacewatch MPC  · JPL
5 1992 JD APO 25.036 msingle6 days09 May 199223Disc.: Spacewatch
AMO at MPC		 MPC  · JPL
0 1992 SW MCA 19.93300 mmultiple1992–202409 Aug 202455Disc.: Spacewatch MPC  · JPL
– 1992 SX MCA20.0300 msingle7 days04 Oct 199214Disc.: Spacewatch MPC  · JPL
0 1992 SZ AMO 19.97350 mmultiple1992–202402 Jun 202470Disc.: Spacewatch MPC  · JPL
0 1992 SN4 MBA-M18.55820 mmultiple1992–202227 Jan 202265Disc.: Spacewatch MPC  · JPL
0 1992 SC8 MBA-M18.38890 mmultiple1992–202130 Nov 202182Disc.: Spacewatch
Alt.: 2017 WV33		 MPC  · JPL
0 1992 SW11 MBA-I17.281.0 kmmultiple1992–202525 Mar 202530Disc.: Spacewatch MPC  · JPL
0 1992 SB12 MBA-I19.09600 mmultiple1992–202420 Nov 202490Disc.: Spacewatch
Alt.: 2017 SW186		 MPC  · JPL
E 1992 SZ17 MBA-M13.87.3 kmsingle4 days03 Oct 19926Disc.: Palomar Obs. MPC  · JPL
E 1992 TY1 MBA-O12.815 kmsingle3 days05 Oct 19925Disc.: Kitt Peak Obs. MPC  · JPL
– 1992 TZ1 MBA-I15.52.4 kmsingle4 days05 Oct 19925Disc.: Kitt Peak Obs. MPC  · JPL
1 1992 XA MBA-O17.51.8 kmmultiple1992–201813 Dec 2018161Disc.: Spacewatch
Alt.: 2005 UG242		 MPC  · JPL
4 1992 YD3 APO 26.419 msingle0 day27 Dec 199212Disc.: Spacewatch
AMO at MPC		 MPC  · JPL
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1993

U Designation Class Physical Observations Description and notesRef
H D Opp. Arc LastUsed
7 1993 BD3 AMO 26.220 msingle5 days31 Jan 199314Disc.: Spacewatch MPC  · JPL
7 1993 BU3 AMO21.17210 msingle33 days03 Mar 199318Disc.: Spacewatch MPC  · JPL
1 1993 BC10 MBA-M18.58800 mmultiple1993–202412 Aug 202458Disc.: Spacewatch MPC  · JPL
6 1993 DA ATE 26.419 msingle5 days22 Feb 199318Disc.: Spacewatch MPC  · JPL
7 1993 FA1 APO 25.923 msingle3 days31 Mar 199317Disc.: Spacewatch
AMO at MPC		 MPC  · JPL
0 1993 HC APO 20.77250 mmultiple1993–202107 May 202158Disc.: Spacewatch MPC  · JPL
3 1993 HP1 APO27.114 msingle0 day27 Apr 199327Disc.: Spacewatch MPC  · JPL
– 1993 KA APO 26.022 msingle9 days26 May 199321Disc.: Spacewatch
AMO at MPC		 MPC  · JPL
9 1993 KA2 APO29.06 msingle1 day22 May 199314Disc.: Spacewatch MPC  · JPL
– 1993 OT MCA19.0470 msingle20 days13 Aug 19939Disc.: Spacewatch MPC  · JPL
1 1993 OY13 MBA-I18.84510 mmultiple1993–202219 Nov 202235Disc.: Spacewatch MPC  · JPL
0 1993 PA1 MBA-I18.73530 mmultiple1993–202313 Jan 202360Disc.: Spacewatch
Alt.: 2009 QA32		 MPC  · JPL
0 1993 PK1 MBA-I18.87510 mmultiple1993–202322 Oct 202369Disc.: Spacewatch MPC  · JPL
3 1993 RP TNO 9.3759 kmmultiple1993-201602 Nov 201637Disc.: Mauna Kea Obs.
LoUTNOs, res  · 4:5
Alt.: 2015 VR202		 MPC  · JPL
1 1993 TZ APO 26.022 mmultiple1993–201614 Oct 201634Disc.: Spacewatch MPC  · JPL
– 1993 TR2 MCA 20.4350 msingle12 days24 Oct 199315Disc.: Spacewatch MPC  · JPL
0 1993 TK4 MBA-M18.75740 mmultiple1993–202318 Oct 202360Disc.: Spacewatch
Alt.: 2019 SY43		 MPC  · JPL
0 1993 TQ4 MBA-I18.03730 mmultiple1993–202408 Nov 202470Disc.: Spacewatch MPC  · JPL
6 1993 UA APO 25.430 msingle3 days24 Oct 199315Disc.: Spacewatch MPC  · JPL
0 1993 UD AMO 20.38300 mmultiple1993–202215 Dec 202268Disc.: Spacewatch MPC  · JPL
0 1993 UY7 MCA18.75530 mmultiple1993-202223 Oct 202252Disc.: Spacewatch
Alt.: 2015 XV465		 MPC  · JPL
1 1993 VC MCA 20.5330 mmultiple1993–200711 Nov 200734Disc.: Spacewatch MPC  · JPL
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1994

U Designation Class Physical Observations Description and notesRef
H D Opp. Arc LastUsed
0 1994 AC5 MBA-I18.86570 mmultiple1994–202523 Jan 202575Disc.: Spacewatch MPC  · JPL
2 1994 AS8 MBA-M17.541.3 kmmultiple1994–202129 Nov 202145Disc.: Spacewatch
Alt.: 2005 YX110		 MPC  · JPL
0 1994 AD17 MBA-M18.64790 mmultiple1994–202408 Feb 202433Disc.: Spacewatch MPC  · JPL
2 1994 BB AMO 23.571 mmultiple1994–201718 Feb 201758Disc.: Spacewatch MPC  · JPL
1 1994 BW2 MBA-M18.41870 mmultiple1994–202430 Jan 202430Disc.: Spacewatch MPC  · JPL
0 1994 BA6 MBA-M18.92690 mmultiple1994–202216 Oct 202244Disc.: Spacewatch
Alt.: 2018 QG9		 MPC  · JPL
0 1994 CJ1 AMO 21.55190 mmultiple1994–202507 Feb 2025177Disc.: Spacewatch
Potentially hazardous object
AMO at MPC		 MPC  · JPL
3 1994 EJ MCA 19.1450 mmultiple1994–202028 Apr 202056Disc.: Spacewatch MPC  · JPL
1 1994 EK APO 20.3310 mmultiple1994–201314 Feb 201399Disc.: Spacewatch
Potentially hazardous object 		MPC  · JPL
7 1994 EU APO25.923 msingle12 days22 Mar 199416Disc.: Spacewatch MPC  · JPL
– 1994 ES1 APO28.57 msingle1 day15 Mar 199413Disc.: Spacewatch MPC  · JPL
3 1994 ES2 TNO 7.6100 kmmultiple1994–201518 Feb 201536Disc.: Mauna Kea Obs.
LoUTNOs, cubewano (cold), BR-mag: 1.65		 MPC  · JPL
7 1994 FA APO 25.232 msingle4 days20 Mar 199415Disc.: Spacewatch
AMO at MPC		 MPC  · JPL
8 1994 GK APO24.251 msingle3 days10 Apr 199410Disc.: Spacewatch MPC  · JPL
3 1994 GL ATE 25.528 mmultiple1994–202006 Apr 202088Disc.: Spacewatch MPC  · JPL
7 1994 GV APO 27.412 msingle2 days15 Apr 199411Disc.: Spacewatch MPC  · JPL
0 1994 JB6 MBA-M18.38700 mmultiple1994–202322 Jun 202363Disc.: Spacewatch
Alt.: 2019 KC16		 MPC  · JPL
0 1994 JO8 MBA-O17.921.4 kmmultiple1994-202107 Feb 202126Disc.: Mauna Kea Obs.
Alt.: 2016 FR28		 MPC  · JPL
3 1994 NE APO 19.8390 msingle26 days08 Jul 199437Disc.: Palomar Obs.
Potentially hazardous object 		MPC  · JPL
0 1994 NK AMO 20.0360 mmultiple1994–201904 Feb 2019300Disc.: Spacewatch MPC  · JPL
0 1994 PC3 MBA-M17.88820 mmultiple1994–202503 Mar 2025193Disc.: La Silla Obs.
Alt.: 2016 AW90		 MPC  · JPL
7 1994 RB APO 23.474 msingle2 days03 Sep 199421Disc.: Spacewatch MPC  · JPL
– 1994 RV1 MCA 19.9310 msingle23 days28 Sep 19949Disc.: Spacewatch MPC  · JPL
0 1994 RW1 MCA18.9490 mmultiple1994–202113 Jun 202161Disc.: Spacewatch MPC  · JPL
0 1994 RH6 MBA-I18.90490 mmultiple1994–202419 Apr 2024104Disc.: Spacewatch
Alt.: 2011 UO123		 MPC  · JPL
3 1994 RT14 MCA19.3410 mmultiple1994–202108 Jun 202127Disc.: La Silla Obs.
Alt.: 2018 LO4		 MPC  · JPL
0 1994 RB30 MBA-O17.31.9 kmmultiple1994–202201 Aug 202241Disc.: Spacewatch MPC  · JPL
1 1994 RE30 MBA-M18.171.3 kmmultiple1994–202113 Nov 202151Disc.: Spacewatch MPC  · JPL
0 1994 SP1 MBA-I19.01470 mmultiple1994–201901 Jul 201959Disc.: Spacewatch
Alt.: 2010 UB20		 MPC  · JPL
1 1994 SD3 MBA-M18.3920 mmultiple1994–202114 Aug 202130Disc.: Spacewatch
Alt.: 2012 QR74		 MPC  · JPL
0 1994 SU4 MBA-M18.38890 mmultiple1994–202128 Nov 202150Disc.: Spacewatch MPC  · JPL
1 1994 SM6 MBA-M18.77730 mmultiple1994–202019 Nov 202059Disc.: Spacewatch
Alt.: 2020 UT31		 MPC  · JPL
0 1994 SJ8 MBA-M18.5840 mmultiple1994–202014 Dec 202054Disc.: Spacewatch
Alt.: 2020 WQ12		 MPC  · JPL
1 1994 SP8 MBA-O17.881.5 kmmultiple1994–202229 Nov 202244Disc.: Spacewatch
Alt.: 2005 SQ199		 MPC  · JPL
2 1994 SZ10 MBA-O17.882.0 kmmultiple1994–202218 Oct 202229Disc.: Spacewatch MPC  · JPL
0 1994 SF13 MBA-M18.32900 mmultiple1994–202425 Sep 202475Disc.: Spacewatch
Alt.: 2014 HU329		 MPC  · JPL
3 1994 TA CEN 11.1628 kmmultiple1994–202113 Mar 202135Disc.: Mauna Kea Obs.
, BR-mag: 1.98; taxonomy: RR		 MPC  · JPL
E 1994 TG TNO 7.0204 kmsingle3 days06 Oct 19948Disc.: Mauna Kea Obs.
LoUTNOs, cubewano (hot)		 MPC  · JPL
E 1994 TH TNO7.0166 kmsingle3 days06 Oct 19946Disc.: Mauna Kea Obs.
LoUTNOs, other TNO		 MPC  · JPL
3 1994 TA2 AMO 20.39310 mmultiple1994-202424 Oct 202437Disc.: Spacewatch MPC  · JPL
7 1994 TE2 AMO22.7100 msingle2 days13 Oct 199415Disc.: Spacewatch MPC  · JPL
– 1994 TG2 TNO 7.0137 kmsingle32 days09 Nov 19948Disc.: La Silla Obs.
LoUTNOs, cubewano?		 MPC  · JPL
0 1994 TO8 MBA-M18.11.0 kmmultiple1994–201820 Jan 201837Disc.: Spacewatch MPC  · JPL
0 1994 TN12 MBA-M18.7760 mmultiple1994–202015 Oct 202039Disc.: Spacewatch MPC  · JPL
1 1994 TP12 MBA-I18.87520 mmultiple1994–202401 Sep 202433Disc.: Spacewatch MPC  · JPL
0 1994 TR13 MBA-I19.76330 mmultiple1994–201929 Jun 201935Disc.: Spacewatch MPC  · JPL
0 1994 TC18 MBA-O17.032.2 kmmultiple1994–202103 May 202143Disc.: Spacewatch MPC  · JPL
6 1994 US AMO 21.0220 msingle13 days11 Nov 199418Disc.: Spacewatch MPC  · JPL
1 1994 UE5 MBA-O17.621.6 kmmultiple1994–202216 Nov 202233Disc.: Spacewatch MPC  · JPL
0 1994 UF10 MBA-M17.971.4 kmmultiple1994–202110 Sep 202146Disc.: Spacewatch MPC  · JPL
1 1994 UJ10 MCA 19.78700 mmultiple1994-202407 Dec 202446Disc.: Spacewatch
Alt.: 2024 TM39		 MPC  · JPL
0 1994 UK13 MBA-M18.021.0 kmmultiple1994–202227 Jan 202268Disc.: Spacewatch MPC  · JPL
0 1994 VM4 MBA-M17.821.1 kmmultiple1994–202227 Jan 202286Disc.: Spacewatch MPC  · JPL
5 1994 VH8 APO 27.710 msingle0 day01 Nov 19945Disc.: Spacewatch MPC  · JPL
1 1994 WY1 MCA 18.8730 mmultiple1994–201929 Sep 2019114Disc.: Spacewatch
Alt.: 2015 RY30		 MPC  · JPL
0 1994 WZ1 MCA18.92490 mmultiple1994–202112 Jan 2021106Disc.: Spacewatch MPC  · JPL
2 1994 WZ2 MCA17.91.5 kmmultiple1990–199905 Oct 199940Disc.: Siding Spring MPC  · JPL
0 1994 WR12 ATE 22.41120 mmultiple1994–202418 Jan 2024128Disc.: Palomar Obs. MPC  · JPL
2 1994 XG APO 18.68680 mmultiple1994–202217 Dec 202262Disc.: Spacewatch MPC  · JPL
3 1994 XM1 APO28.28 msingle0 day09 Dec 199410Disc.: Spacewatch MPC  · JPL
1 1994 YE4 MBA-M17.41980 mmultiple1994–202312 Jan 202363Disc.: Spacewatch MPC  · JPL
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1995–2004

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. 1 2 3 4 5 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". [8] [9]

References

  1. 1 2 3 4 5 "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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