List of unnumbered minor planets

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Unnumbered minor planets (single-opposition): 107,247 bodies (9.5%)Unnumbered minor planets (multiple-opposition): 427,013 bodies (38.0%)Numbered minor planets: 585,962 bodies (52.1%)Comets: 4,616 bodies (0.4%)Circle frame.svg
Breakdown of 1,124,838 small bodies of the Solar System:[1][a]
  107,247 single-opposition MPs
  427,013 multiple-opposition MPs
  585,962 numbered MPs
  4,616 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 2021, the Minor Planet Center (MPC) accounts for 534,260 unnumbered minor planets which represent 48% of the overall minor planet population.[1][a] Unnumbered minor planets can be further divided into 107,247 single-opposition objects with short observation arcs, prone to mismatch and loss, and 427,013 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 536,878 unnumbered minor planets.[2]

The tables below contain 113 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 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 21 August 2021 the MPC's orbit database contains 534,260 uMPs. Objects observed on a single opposition (total of 107,247) are displayed with a lighter color than multi-opposition objects (total of 427,013).[1][a]
  Until 2004: 35,037 uMPs (7%) are listed on this and other partial pages
  Since 2005: 499,220 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 Observations Description and notes Ref
H D Opp. Arc Last Used
– MBA-O 11.0 35 km single 34 days 05 Jul 1927 3 Disc.: Heidelberg Obs.
Oldest lost asteroid		 MPC · JPL
E MCA — — single 4 days 23 Oct 1935 3 Disc.: Uccle Obs. MPC · JPL
– MBA-I — — single 32 days 13 Mar 1937 3 Disc.: Uccle Obs. MPC · JPL
– MBA-O 12.0 22 km single 27 days 12 Oct 1939 3 Disc.: Uccle Obs. MPC · JPL
– MBA-I 13.8 5.2 km single 10 days 15 Sep 1942 3 Disc.: Turku Obs. MPC · JPL

1960–1969[]

U Designation Class Observations Description and notes Ref
H D Opp. Arc Last Used
E MCA 20.3 260 m single 4 days 28 Sep 1960 7 Disc.: Palomar–Leiden MPC · JPL
1 MBA-I 18.5 590 m multiple 1960–2017 07 Nov 2017 79 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 MCA 17.4 1.8 km single 4 days 28 Sep 1960 6 Disc.: Palomar Obs. MPC · JPL

1970–1979[]

U Designation Class Observations Description and notes Ref
H D Opp. Arc Last Used
E 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

1980–1989[]

U Designation Class Observations Description and notes Ref
H D Opp. Arc Last Used
0 MBA-I 17.49 940 m multiple 1981–2021 01 May 2021 151 Disc.: Siding Spring
Alt.: 2014 FN21		 MPC · JPL
1 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 APO 19.5 450 m multiple 1983–2021 05 Jul 2021 157 Disc.: Palomar Obs.
Potentially hazardous object		 MPC · JPL
1 MCA 18.1 710 m multiple 1983–2017 24 Dec 2017 40 Disc.: Palomar Obs. MPC · JPL
0 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 HUN 18.6 570 m multiple 1986–2020 14 Jun 2020 87 Disc.: Spacewatch
Alt.: 2005 UU548		 MPC · JPL
0 AMO 19.96 360 m multiple 1986–2021 21 Jun 2021 38 Disc.: Palomar Obs.
Alt.: 2013 UU3		 MPC · JPL
2 AMO 19.1 540 m multiple 1988–2015 17 Oct 2015 95 Disc.: Palomar Obs. MPC · JPL
0 MCA 16.7 2.5 km multiple 1988–2021 18 Jan 2021 331 Disc.: Palomar Obs.
Alt.: 2009 WD77		 MPC · JPL
– MBA-M 11.1 25 km single 11 days 12 Sep 1988 15 Disc.: La Silla Obs. MPC · JPL
1 APO 19.6 430 m multiple 1989–2008 09 Feb 2008 121 Disc.: Palomar Obs. MPC · JPL
E MBA-O 13.5 11 km single 2 days 28 Mar 1989 6 Disc.: Kleť Obs. MPC · JPL

1990–1993[]

U Designation Class Observations Description and notes Ref
H D Opp. Arc Last Used
0 MBA-O 16.0 3.5 km multiple 1990–2020 21 Jul 2020 112 Disc.: La Silla Obs.
Added on 11 May 2021
Alt.: 2008 GU14		 MPC · JPL
8 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 MCA 19.4 390 m multiple 1991–2020 27 May 2020 130 Disc.: Spacewatch
Alt.: 2020 BE6		 MPC · JPL
2 APO 20.0 360 m multiple 1991–2015 03 May 2015 79 Disc.: Kitami Obs.
Potentially hazardous object
Alt.: 1999 HC		 MPC · JPL
7 AMO 23.4 74 m single 11 days 19 May 1991 20 Disc.: Spacewatch MPC · JPL
1 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 MBA-I 19.2 430 m multiple 1991–2018 15 Oct 2018 35 Disc.: Spacewatch MPC · JPL
0 MBA-O 16.3 3.1 km multiple 1991–2020 27 Apr 2020 85 Disc.: Spacewatch MPC · JPL
0 MBA-M 17.0 1.2 km multiple 1991–2021 11 Jan 2021 198 Disc.: Spacewatch
Alt.: 2017 BL95		 MPC · JPL
7 APO 26.0 22 m single 3 days 09 Oct 1991 8 Disc.: Spacewatch
AMO at MPC		 MPC · JPL
6 APO 28.4 7 m single 0 day 07 Oct 1991 4 Disc.: Spacewatch MPC · JPL
0 APO 19.26 500 m multiple 1991–2021 20 Apr 2021 252 Disc.: Palomar Obs. MPC · JPL
0 MBA-M 17.2 1.5 km multiple 1991–2020 20 Apr 2020 88 Disc.: Spacewatch MPC · JPL
0 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 MBA-M 17.0 1.2 km multiple 1991–2021 08 Jan 2021 193 Disc.: Palomar–DSS
Alt.: 2016 XN4		 MPC · JPL
1 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 MBA-M 16.9 1.2 km multiple 1991–2021 10 Jan 2021 205 Disc.: Spacewatch MPC · JPL
0 MBA-I 17.8 820 m multiple 1991–2019 24 Aug 2019 112 Disc.: Spacewatch MPC · JPL
– APO 26.5 18 m single 8 days 09 Nov 1991 13 Disc.: Spacewatch MPC · JPL
E 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 MBA-M 17.15 2.1 km multiple 1991–2021 08 Apr 2021 200 Disc.: Spacewatch
Alt.: 2005 VB112		 MPC · JPL
8 APO 23.7 65 m single 12 days 15 Dec 1991 7 Disc.: Spacewatch MPC · JPL
1 AMO 18.8 620 m multiple 1991–2011 24 Jul 2011 38 Disc.: Palomar Obs. MPC · JPL
7 APO 25.3 31 m single 3 days 29 Feb 1992 11 Disc.: Spacewatch MPC · JPL
1 MCA 18.3 650 m multiple 1992–2021 16 Jan 2021 88 Disc.: Spacewatch
Alt.: 2003 EL1		 MPC · JPL
5 APO 25.0 36 m single 6 days 09 May 1992 23 Disc.: Spacewatch
AMO at MPC		 MPC · JPL
1 MCA 19.9 310 m multiple 1992–2019 09 Apr 2019 47 Disc.: Spacewatch MPC · JPL
– MCA 20.0 300 m single 7 days 04 Oct 1992 Disc.: Spacewatch MPC · JPL
5 AMO 20.1 340 m single 99 days 29 Nov 1992 26 Disc.: Spacewatch MPC · JPL
1 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 MBA-M 18.3 650 m multiple 1992–2017 23 Dec 2017 53 — MPC · JPL
2 MBA-I 17.3 1.0 km multiple 1992–2020 25 Dec 2020 20 Disc.: Spacewatch
Added on 21 August 2021		 MPC · JPL
E MBA-M 13.8 7.3 km single 4 days 03 Oct 1992 6 Disc.: Palomar Obs. MPC · JPL
0 MBA-M 17.31 1.0 km multiple 1992–2021 13 Aug 2021 112 Disc.: Spacewatch MPC · JPL
E MBA-O 12.8 15 km single 3 days 05 Oct 1992 5 Disc.: Kitt Peak Obs. MPC · JPL
– MBA-I 15.5 2.4 km single 4 days 05 Oct 1992 5 Disc.: Kitt Peak Obs. MPC · JPL
0 MBA-O 16.39 2.9 km multiple 1992–2021 14 Aug 2021 111 Disc.: Spacewatch MPC · JPL
0 MBA-O 15.9 3.7 km multiple 1992–2021 02 Jan 2021 151 Disc.: Spacewatch MPC · JPL
0 MBA-M 17.97 760 m multiple 1992–2021 11 Aug 2021 98 Disc.: Spacewatch MPC · JPL
1 MBA-O 17.5 1.8 km multiple 1992–2018 13 Dec 2018 156 Disc.: Spacewatch
Alt.: 2005 UG242		 MPC · JPL
1 MCA 18.8 520 m multiple 1992–2021 06 Jan 2021 83 Disc.: Spacewatch
Alt.: 2006 SJ289		 MPC · JPL
4 APO 26.4 19 m single 0 day 27 Dec 1992 12 Disc.: Spacewatch
AMO at MPC		 MPC · JPL
7 AMO 26.2 20 m single 5 days 31 Jan 1993 14 Disc.: Spacewatch MPC · JPL
5 AMO 21.5 180 m single 33 days 03 Mar 1993 18 Disc.: Spacewatch MPC · JPL
0 MBA-M 17.53 1.3 km multiple 1993–2021 13 Jul 2021 138 Disc.: Spacewatch
Alt.: 2011 FR39, 2015 BQ428		 MPC · JPL
2 MBA-M 18.4 620 m multiple 1993–2020 16 Sep 2020 51 Disc.: Spacewatch
Added on 22 July 2020		 MPC · JPL
0 MBA-I 18.4 620 m multiple 1993–2021 04 Jan 2021 58 Disc.: Spacewatch
Alt.: 2006 XR55		 MPC · JPL
0 MBA-O 17.1 2.1 km multiple 1993–2020 23 Oct 2020 89 Disc.: Spacewatch MPC · JPL
0 MBA-I 18.5 590 m multiple 1993–2019 09 Jan 2019 83 Disc.: Spacewatch MPC · JPL
0 JT 13.08 13 km multiple 1990–2021 05 Aug 2021 243 Disc.: Spacewatch
Trojan camp (L5)		 MPC · JPL
0 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 APO 25.9 23 m single 3 days 31 Mar 1993 17 Disc.: Spacewatch
AMO at MPC		 MPC · JPL
0 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 MBA-M 17.77 1.6 km multiple 1993–2021 13 Jul 2021 62 Disc.: Spacewatch
Added on 22 July 2020		 MPC · JPL
0 APO 20.77 250 m multiple 1993–2021 07 May 2021 54 Disc.: Spacewatch MPC · JPL
3 APO 27.1 14 m single 0 day 27 Apr 1993 27 Disc.: Spacewatch MPC · JPL
0 MBA-M 17.5 1.3 km multiple 1993–2020 26 Sep 2020 56 Disc.: Spacewatch
Added on 22 July 2020		 MPC · JPL
– APO 26.0 22 m single 9 days 26 May 1993 21 Disc.: Spacewatch
AMO at MPC		 MPC · JPL
– APO 29.0 6 m single 1 day 22 May 1993 10 Disc.: Spacewatch MPC · JPL
1 MCA 16.8 1.8 km multiple 1993–2020 10 Dec 2020 136 Disc.: Palomar Obs. MPC · JPL
– MCA 19.0 470 m single 20 days 13 Aug 1993 9 Disc.: Spacewatch MPC · JPL
– MBA-M 17.5 1.3 km single 20 days 13 Aug 1993 9 Disc.: Spacewatch MPC · JPL
0 MBA-M 17.2 1.1 km multiple 1993–2018 08 Nov 2018 122 Disc.: La Silla Obs. MPC · JPL
0 MBA-I 17.80 820 m multiple 1993–2021 28 Jul 2021 113 Disc.: La Silla Obs.
Alt.: 2004 TH237		 MPC · JPL
0 MBA-I 18.71 540 m multiple 1993–2021 18 Apr 2021 36 Disc.: Spacewatch
Alt.: 2009 QA32		 MPC · JPL
2 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 MBA-O 15.8 3.9 km multiple 1993–2020 22 Oct 2020 122 Disc.: Spacewatch MPC · JPL
0 MBA-O 16.41 2.9 km multiple 1993–2021 13 Aug 2021 89 Disc.: Spacewatch MPC · JPL
1 APO 26.0 22 m multiple 1993–2016 14 Oct 2016 34 Disc.: Spacewatch MPC · JPL
– MCA 20.4 350 m single 12 days 24 Oct 1993 15 Disc.: Spacewatch MPC · JPL
2 MBA-M 18.7 760 m multiple 1993–2020 19 Jan 2020 42 Alt.: 2019 SY43 MPC · JPL
2 MBA-I 17.9 780 m multiple 1993–2020 15 May 2020 39 Disc.: Spacewatch
Added on 22 July 2020		 MPC · JPL
0 MBA-I 18.1 710 m multiple 1993–2020 18 Oct 2020 75 Disc.: Spacewatch
Alt.: 2005 YB104		 MPC · JPL
0 MBA-M 19.3 410 m multiple 1993–2019 07 Jan 2019 43 Disc.: Spacewatch MPC · JPL
– MBA-M 16.5 2.1 km single 11 days 20 Oct 1993 Disc.: La Silla Obs. MPC · JPL
6 APO 25.4 30 m single 3 days 24 Oct 1993 15 Disc.: Spacewatch MPC · JPL
2 AMO 20.0 360 m multiple 1993–2020 01 Mar 2020 68 Disc.: Spacewatch MPC · JPL
0 MBA-M 17.0 2.2 km multiple 1993–2019 09 Apr 2019 88 Disc.: Spacewatch MPC · JPL
1 MCA 20.5 440 m multiple 1993–2007 11 Nov 2007 34 Disc.: Spacewatch MPC · JPL
1 MBA-I 18.3 650 m multiple 1993–2021 17 Jan 2021 63 Disc.: Spacewatch MPC · JPL
0 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 MBA-O 16.6 2.7 km multiple 1993–2020 24 Dec 2020 90 Disc.: Spacewatch MPC · JPL
0 MBA-O 16.94 2.3 km multiple 1993–2021 18 Aug 2021 53 Alt.: 2015 RE311 MPC · JPL
– MBA-M 17.2 1.1 km single 17 days 10 Nov 1993 9 Disc.: Spacewatch MPC · JPL
0 MBA-M 17.7 1.2 km multiple 1993–2020 22 Mar 2020 92 Disc.: Spacewatch
Alt.: 2010 TZ5		 MPC · JPL
0 MBA-I 18.09 720 m multiple 1993–2021 03 Aug 2021 118 Disc.: Spacewatch MPC · JPL

1994–2004[]

2001
2002
2003
2004

2005–present[]

See also: Category:Minor planet object articles (unnumbered) and Category:Minor planet object redirects (unnumbered)

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. ^ Jump up to: 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[]

  1. ^ Jump up to: a b c d e "Data Available from the Minor Planet Center – MPCORB.DAT". Minor Planet Center. 21 August 2021. (doc)
  2. ^ "How Many Solar System Bodies". Jet Propulsion Laboratory – Small-Body Database. Retrieved 27 August 2021.
  3. ^ "List Of Jupiter Trojans". Minor Planet Center. 14 June 2021. Retrieved 27 August 2021.
  4. ^ Johnston, Wm. Robert (18 August 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 27 August 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. 10 August 2021. Retrieved 27 August 2021.
  9. ^ "MPC Archive Statistics – Orbits And Names". Minor Planet Center. 18 May 2019. Retrieved 27 August 2021.
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