List of unnumbered minor planets

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Unnumbered minor planets (single-opposition): 110,327 bodies (9.7%)Unnumbered minor planets (multiple-opposition): 427,730 bodies (37.6%)Numbered minor planets: 594,943 bodies (52.3%)Comets: 4,576 bodies (0.4%)Circle frame.svg
Breakdown of 1,137,576 small bodies of the Solar System:[1][a]
  110,327 single-opposition MPs
  427,730 multiple-opposition MPs
  594,943 numbered MPs
  4,576 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 October 2021, the Minor Planet Center (MPC) accounts for 538,057 unnumbered minor planets which represent 47% of the overall minor planet population.[1][a] Unnumbered minor planets can be further divided into 110,327 single-opposition objects with short observation arcs, prone to mismatch and loss, and 427,730 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 547,920 unnumbered minor planets.[2]

The tables below contain 114 objects with a principal designation assigned between 1927 and 1993. Additional partial lists cover the period from 1994 to 2004.[a] 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[edit]

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 30 September 2021 the MPC's orbit database contains 538,057 uMPs. Objects observed on a single opposition (total of 110,327) are displayed with a lighter color than multi-opposition objects (total of 427,730).[1][a]
  Until 2004: 34,419 uMPs (6%) are listed on this and other partial pages
  Since 2005: 503,635 uMPs (94%) are not listed

1900–1959[edit]

U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
1927 LA MBA-O 11.0 35 km single 34 days 05 Jul 1927 3 Disc.: Heidelberg Obs.
Oldest lost asteroid
MPC · JPL
E 1935 UZ MCA single 4 days 23 Oct 1935 3 Disc.: Uccle Obs. MPC · JPL
1937 CK MBA-I single 32 days 13 Mar 1937 3 Disc.: Uccle Obs. MPC · JPL
1939 RR MBA-O 12.0 22 km single 27 days 12 Oct 1939 3 Disc.: Uccle Obs. MPC · JPL
1942 RH MBA-I 13.8 5.2 km single 10 days 15 Sep 1942 3 Disc.: Turku Obs. MPC · JPL
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1960–1969[edit]

U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
E 4847 P-L MCA 20.3 260 m single 4 days 28 Sep 1960 7 Disc.: Palomar–Leiden MPC · JPL
0 6331 P-L MBA-I 18.7 550 m multiple 1960–2020 23 Jun 2020 134 Disc.: Palomar–Leiden MPC · JPL
0 6344 P-L APO 20.51 280 m multiple 1960–2021 01 Aug 2021 122 Disc.: Palomar–Leiden
Potentially hazardous object
MPC · JPL
E 1960 SB1 MCA 17.4 1.8 km single 4 days 28 Sep 1960 6 Disc.: Palomar Obs. MPC · JPL
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1970–1979[edit]

U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
E 1979 MW5 MBA-O 16.0 3.5 km single 5 days 29 Jun 1979 3 Disc.: Siding Spring MPC · JPL
9 1979 XB APO 18.6 680 m single 4 days 15 Dec 1979 16 Disc.: Siding Spring
Potentially hazardous object
MPC · JPL
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1980–1989[edit]

U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
0 1981 EN35 MBA-I 17.49 940 m multiple 1981–2021 01 May 2021 151 Disc.: Siding Spring
Alt.: 2014 FN21
MPC · JPL
1 1982 YA AMO 18.1 850 m multiple 1982–2017 03 Dec 2017 68 Disc.: Haute-Provence
NEO larger than 1 kilometer
Alt.: 2003 WE42
MPC · JPL
0 1983 LC APO 19.5 450 m multiple 1983–2021 05 Jul 2021 157 Disc.: Palomar Obs.
Potentially hazardous object
MPC · JPL
1 1983 QC MCA 18.1 710 m multiple 1983–2017 24 Dec 2017 40 Disc.: Palomar Obs. MPC · JPL
0 1984 QL1 Asteroid 15.6 4.2 km multiple 1984–2021 18 Jan 2021 170 Disc.: Palomar Obs.
MCA at MPC
Alt.: 2002 XP102, 2013 JS30
MPC · JPL
1 1986 JE HUN 18.6 570 m multiple 1986–2020 14 Jun 2020 87 Disc.: Spacewatch
Alt.: 2005 UU548
MPC · JPL
0 1986 NA AMO 19.90 370 m multiple 1986–2021 28 Sep 2021 62 Disc.: Palomar Obs.
Alt.: 2013 UU3
MPC · JPL
2 1988 NE AMO 19.1 540 m multiple 1988–2015 17 Oct 2015 95 Disc.: Palomar Obs. MPC · JPL
0 1988 PF1 MCA 16.7 2.5 km multiple 1988–2021 18 Jan 2021 331 Disc.: Palomar Obs.
Alt.: 2009 WD77
MPC · JPL
1988 RH9 MBA-M 11.1 25 km single 11 days 12 Sep 1988 15 Disc.: La Silla Obs. MPC · JPL
1 1989 AZ APO 19.6 430 m multiple 1989–2008 09 Feb 2008 121 Disc.: Palomar Obs. MPC · JPL
E 1989 FR MBA-O 13.5 11 km single 2 days 28 Mar 1989 6 Disc.: Kleť Obs. MPC · JPL
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1990–1993[edit]

U Designation Class Physical Observations Description and notes Ref
H D Opp. Arc Last Used
0 1990 SM24 MBA-O 16.26 3.1 km multiple 1990–2021 12 Sep 2021 118 Disc.: La Silla Obs.
Added on 11 May 2021
Alt.: 2008 GU14
MPC · JPL
8 1990 UN APO 23.5 71 m single 15 days 06 Nov 1990 22 Disc.: Spacewatch MPC · JPL
3 1991 BA APO 28.6 7 m single 0 day 18 Jan 1991 7 Disc.: Spacewatch MPC · JPL
1 1991 GK MCA 19.4 390 m multiple 1991–2020 27 May 2020 130 Disc.: Spacewatch
Alt.: 2020 BE6
MPC · JPL
2 1991 GO APO 20.0 360 m multiple 1991–2015 03 May 2015 79 Disc.: Kitami Obs.
Potentially hazardous object
Alt.: 1999 HC
MPC · JPL
7 1991 JR AMO 23.4 74 m single 11 days 19 May 1991 20 Disc.: Spacewatch MPC · JPL
0 1991 PN MBA-O 16.7 2.5 km multiple 1991–2021 09 May 2021 45 Disc.: Cerro Tololo Obs.
Added on 30 September 2021
MPC · JPL
1 1991 PW22 MBA-M 17.3 1.0 km multiple 1991–2020 15 Dec 2020 51 Disc.: La Silla Obs.
Added on 11 May 2021
Alt.: 2010 CU110
MPC · JPL
2 1991 RN28 MBA-I 19.2 430 m multiple 1991–2018 15 Oct 2018 35 Disc.: Spacewatch MPC · JPL
0 1991 RY42 MBA-O 16.3 3.1 km multiple 1991–2020 27 Apr 2020 85 Disc.: Spacewatch MPC · JPL
0 1991 SU3 MBA-M 17.0 1.2 km multiple 1991–2021 11 Jan 2021 198 Disc.: Spacewatch
Alt.: 2017 BL95
MPC · JPL
7 1991 TT APO 26.0 22 m single 3 days 09 Oct 1991 8 Disc.: Spacewatch
AMO at MPC
MPC · JPL
6 1991 TU APO 28.4 7 m single 0 day 07 Oct 1991 4 Disc.: Spacewatch MPC · JPL
0 1991 TF3 APO 19.25 500 m multiple 1991–2021 28 Sep 2021 270 Disc.: Palomar Obs. MPC · JPL
0 1991 TT8 MBA-M 17.2 1.5 km multiple 1991–2020 20 Apr 2020 88 Disc.: Spacewatch MPC · JPL
0 1991 TY10 MBA-M 17.1 1.1 km multiple 1991–2021 07 Apr 2021 128 Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2011 PM15
MPC · JPL
0 1991 TK16 MBA-M 17.0 1.2 km multiple 1991–2021 08 Jan 2021 193 Disc.: Palomar–DSS
Alt.: 2016 XN4
MPC · JPL
1 1991 TM16 MCA 17.2 1.1 km multiple 1991–2021 17 Jan 2021 76 Disc.: Palomar–DSS
Added on 22 July 2020
Alt.: 2017 AB3
MPC · JPL
0 1991 TD17 MBA-M 16.9 1.2 km multiple 1991–2021 10 Jan 2021 205 Disc.: Spacewatch MPC · JPL
0 1991 TE17 MBA-I 17.8 820 m multiple 1991–2019 24 Aug 2019 112 Disc.: Spacewatch MPC · JPL
1991 VA APO 26.5 18 m single 8 days 09 Nov 1991 13 Disc.: Spacewatch MPC · JPL
E 1991 VD HUN 19.5 370 m single 2 days 06 Nov 1991 9 Disc.: Spacewatch MPC · JPL
0 1991 VG APO 28.3 8 m multiple 1991–2017 01 Jun 2017 66 Disc.: Spacewatch MPC · JPL
0 1991 VO8 MBA-M 17.15 2.1 km multiple 1991–2021 08 Apr 2021 200 Disc.: Spacewatch
Alt.: 2005 VB112
MPC · JPL
8 1991 XA APO 23.7 65 m single 12 days 15 Dec 1991 7 Disc.: Spacewatch MPC · JPL
1 1991 XB AMO 18.8 620 m multiple 1991–2011 24 Jul 2011 38 Disc.: Palomar Obs. MPC · JPL
7 1992 DU APO 25.3 31 m single 3 days 29 Feb 1992 11 Disc.: Spacewatch MPC · JPL
1 1992 DD1 MCA 18.3 650 m multiple 1992–2021 16 Jan 2021 88 Disc.: Spacewatch
Alt.: 2003 EL1
MPC · JPL
5 1992 JD APO 25.0 36 m single 6 days 09 May 1992 23 Disc.: Spacewatch
AMO at MPC
MPC · JPL
1 1992 SW MCA 19.9 310 m multiple 1992–2019 09 Apr 2019 47 Disc.: Spacewatch MPC · JPL
1992 SX MCA 20.0 300 m single 7 days 04 Oct 1992 Disc.: Spacewatch MPC · JPL
1 1992 SZ AMO 20.05 340 m multiple 1992-2021 03 Oct 2021 36 Disc.: Spacewatch MPC · JPL
1 1992 SM4 MBA-O 16.4 2.9 km multiple 1992–2020 21 Apr 2020 71 Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2010 EH143, 2015 DM47
MPC · JPL
2 1992 SN4 MBA-M 18.3 650 m multiple 1992–2017 23 Dec 2017 53 MPC · JPL
2 1992 SW11 MBA-I 17.3 1.0 km multiple 1992–2020 25 Dec 2020 20 Disc.: Spacewatch
Added on 21 August 2021
MPC · JPL
E 1992 SZ17 MBA-M 13.8 7.3 km single 4 days 03 Oct 1992 6 Disc.: Palomar Obs. MPC · JPL
0 1992 SS27 MBA-M 17.32 1.0 km multiple 1992–2021 24 Sep 2021 134 Disc.: Spacewatch MPC · JPL
E 1992 TY1 MBA-O 12.8 15 km single 3 days 05 Oct 1992 5 Disc.: Kitt Peak Obs. MPC · JPL
1992 TZ1 MBA-I 15.5 2.4 km single 4 days 05 Oct 1992 5 Disc.: Kitt Peak Obs. MPC · JPL
0 1992 TJ2 MBA-O 16.40 2.9 km multiple 1992–2021 10 Sep 2021 119 Disc.: Spacewatch MPC · JPL
0 1992 WP10 MBA-O 15.9 3.7 km multiple 1992–2021 02 Jan 2021 151 Disc.: Spacewatch MPC · JPL
0 1992 WQ10 MBA-M 17.93 770 m multiple 1992–2021 25 Sep 2021 119 Disc.: Spacewatch MPC · JPL
1 1992 XA MBA-O 17.5 1.8 km multiple 1992–2018 13 Dec 2018 156 Disc.: Spacewatch
Alt.: 2005 UG242
MPC · JPL
1 1992 YB3 MCA 18.8 520 m multiple 1992–2021 06 Jan 2021 83 Disc.: Spacewatch
Alt.: 2006 SJ289
MPC · JPL
4 1992 YD3 APO 26.4 19 m single 0 day 27 Dec 1992 12 Disc.: Spacewatch
AMO at MPC
MPC · JPL
7 1993 BD3 AMO 26.2 20 m single 5 days 31 Jan 1993 14 Disc.: Spacewatch MPC · JPL
5 1993 BU3 AMO 21.5 180 m single 33 days 03 Mar 1993 18 Disc.: Spacewatch MPC · JPL
0 1993 BZ9 MBA-M 17.53 1.3 km multiple 1993–2021 31 Aug 2021 141 Disc.: Spacewatch
Alt.: 2011 FR39, 2015 BQ428
MPC · JPL
2 1993 BC10 MBA-M 18.4 620 m multiple 1993–2020 16 Sep 2020 51 Disc.: Spacewatch
Added on 22 July 2020
MPC · JPL
0 1993 BK10 MBA-I 18.4 620 m multiple 1993–2021 04 Jan 2021 58 Disc.: Spacewatch
Alt.: 2006 XR55
MPC · JPL
0 1993 BM10 MBA-O 17.1 2.1 km multiple 1993–2020 23 Oct 2020 89 Disc.: Spacewatch MPC · JPL
0 1993 BF12 MBA-I 18.55 580 m multiple 1993–2021 11 Sep 2021 84 Disc.: Spacewatch MPC · JPL
0 1993 BC16 JT 13.09 13 km multiple 1990–2021 26 Aug 2021 247 Disc.: Spacewatch
Trojan camp (L5)
MPC · JPL
0 1993 BD16 JT 14.1 8.4 km multiple 1993–2021 11 May 2021 181 Disc.: Spacewatch
Trojan camp (L5)
MPC · JPL
6 1993 DA ATE 26.4 19 m single 5 days 22 Feb 1993 18 Disc.: Spacewatch MPC · JPL
7 1993 FA1 APO 25.9 23 m single 3 days 31 Mar 1993 17 Disc.: Spacewatch
AMO at MPC
MPC · JPL
0 1993 FB85 MBA-M 17.3 1.9 km multiple 1993–2021 19 Jun 2021 52 Disc.: Spacewatch
Added on 22 July 2020
Alt.: 2002 GO188
MPC · JPL
0 1993 FE85 MBA-M 17.77 1.6 km multiple 1993–2021 13 Jul 2021 62 Disc.: Spacewatch
Added on 22 July 2020
MPC · JPL
0 1993 HC APO 20.77 250 m multiple 1993–2021 07 May 2021 54 Disc.: Spacewatch MPC · JPL
3 1993 HP1 APO 27.1 14 m single 0 day 27 Apr 1993 27 Disc.: Spacewatch MPC · JPL
0 1993 HF2 MBA-M 17.5 1.3 km multiple 1993–2020 26 Sep 2020 56 Disc.: Spacewatch
Added on 22 July 2020
MPC · JPL
1993 KA APO 26.0 22 m single 9 days 26 May 1993 21 Disc.: Spacewatch
AMO at MPC
MPC · JPL
1993 KA2 APO 29.0 6 m single 1 day 22 May 1993 10 Disc.: Spacewatch MPC · JPL
1 1993 ME1 MCA 16.8 1.8 km multiple 1993–2020 10 Dec 2020 136 Disc.: Palomar Obs. MPC · JPL
1993 OT MCA 19.0 470 m single 20 days 13 Aug 1993 9 Disc.: Spacewatch MPC · JPL
1993 OM1 MBA-M 17.5 1.3 km single 20 days 13 Aug 1993 9 Disc.: Spacewatch MPC · JPL
0 1993 OW5 MBA-M 17.2 1.1 km multiple 1993–2018 08 Nov 2018 122 Disc.: La Silla Obs. MPC · JPL
0 1993 OP9 MBA-I 17.80 820 m multiple 1993–2021 28 Jul 2021 113 Disc.: La Silla Obs.
Alt.: 2004 TH237
MPC · JPL
0 1993 PA1 MBA-I 18.71 540 m multiple 1993–2021 18 Apr 2021 36 Disc.: Spacewatch
Alt.: 2009 QA32
MPC · JPL
2 1993 PK1 MBA-I 18.6 570 m multiple 1993–2019 23 Sep 2019 37 Disc.: Spacewatch MPC · JPL
E 1993 RP TNO 9.0 70 km single 2 days 17 Sep 1993 6 Disc.: Mauna Kea Obs.
LoUTNOs, plutino?
MPC · JPL
0 1993 RG21 MBA-O 15.8 3.9 km multiple 1993–2020 22 Oct 2020 122 Disc.: Spacewatch MPC · JPL
0 1993 SZ16 MBA-O 16.47 2.8 km multiple 1993–2021 27 Sep 2021 102 Disc.: Spacewatch MPC · JPL
1 1993 TZ APO 26.0 22 m multiple 1993–2016 14 Oct 2016 34 Disc.: Spacewatch MPC · JPL
1993 TR2 MCA 20.4 350 m single 12 days 24 Oct 1993 15 Disc.: Spacewatch MPC · JPL
2 1993 TK4 MBA-M 18.7 760 m multiple 1993–2020 19 Jan 2020 42 Alt.: 2019 SY43 MPC · JPL
2 1993 TQ4 MBA-I 17.9 780 m multiple 1993–2020 15 May 2020 39 Disc.: Spacewatch
Added on 22 July 2020
MPC · JPL
0 1993 TL6 MBA-I 18.1 710 m multiple 1993–2020 18 Oct 2020 75 Disc.: Spacewatch
Alt.: 2005 YB104
MPC · JPL
0 1993 TC11 MBA-M 19.3 410 m multiple 1993–2019 07 Jan 2019 43 Disc.: Spacewatch MPC · JPL
1993 TS35 MBA-M 16.5 2.1 km single 11 days 20 Oct 1993 Disc.: La Silla Obs. MPC · JPL
6 1993 UA APO 25.4 30 m single 3 days 24 Oct 1993 15 Disc.: Spacewatch MPC · JPL
2 1993 UD AMO 20.0 360 m multiple 1993–2020 01 Mar 2020 68 Disc.: Spacewatch MPC · JPL
0 1993 UH10 MBA-M 17.20 2.0 km multiple 1993–2021 11 Sep 2021 90 Disc.: Spacewatch MPC · JPL
1 1993 VC MCA 20.5 440 m multiple 1993–2007 11 Nov 2007 34 Disc.: Spacewatch MPC · JPL
1 1993 VD6 MBA-I 18.3 650 m multiple 1993–2021 17 Jan 2021 63 Disc.: Spacewatch MPC · JPL
0 1993 VE6 MBA-I 19.0 470 m multiple 1993–2020 05 Nov 2020 42 Disc.: Spacewatch
Added on 11 May 2021
Alt.: 2003 SE413
MPC · JPL
0 1993 VG6 MBA-O 16.6 2.7 km multiple 1993–2020 24 Dec 2020 90 Disc.: Spacewatch MPC · JPL
0 1993 VQ6 MBA-O 16.94 2.3 km multiple 1993–2021 18 Aug 2021 53 Alt.: 2015 RE311 MPC · JPL
1993 VT6 MBA-M 17.2 1.1 km single 17 days 10 Nov 1993 9 Disc.: Spacewatch MPC · JPL
0 1993 WG MBA-M 17.7 1.2 km multiple 1993–2020 22 Mar 2020 92 Disc.: Spacewatch
Alt.: 2010 TZ5
MPC · JPL
0 1993 XN3 MBA-I 18.09 720 m multiple 1993–2021 03 Aug 2021 118 Disc.: Spacewatch MPC · JPL
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1994–2004[edit]

2001
2002
2003
2004

2005–present[edit]

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[edit]

Notes[edit]

  1. ^ a b c d 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[edit]

  1. ^ a b c d e "Data Available from the Minor Planet Center – MPCORB.DAT". Minor Planet Center. 30 September 2021. (doc)
  2. ^ "How Many Solar System Bodies". Jet Propulsion Laboratory – Small-Body Database. Retrieved 5 October 2021.
  3. ^ "List Of Jupiter Trojans". Minor Planet Center. 30 September 2021. Retrieved 5 October 2021.
  4. ^ Johnston, Wm. Robert (29 August 2021). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 5 October 2021.
  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. 30 September 2021. Retrieved 5 October 2021.
  9. ^ "MPC Archive Statistics – Orbits And Names". Minor Planet Center. 18 May 2019. Retrieved 5 October 2021.