List of unnumbered trans-Neptunian objects

This is a list of unnumbered trans-Neptunian objects (TNOs) first observed since 1993 and grouped by the year of in which they received a temporary name or a permanent one.

  Statistics 

 List 

 1993 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   15 September 1993  Mauna Kea Obs. ()  48  res4:5  35.1  0.06  4  33.2  37.0  —  

 1994 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   13 March 1994  J. X. LuuD. C. Jewitt ()  100  cubewano (cold)  45.6  0.11  1  40.4  50.8  BR-mag: 1.65     3 October 1994  Mauna Kea Obs. ()  204  cubewano (hot)  42.3  0.00  7  42.3  42.3  —     8 October 1994  La Silla Obs. ()  137  cubewano?  42.4  0.00  2  42.4  42.4  —     3 October 1994  Mauna Kea Obs. ()  166  other TNO  40.9  0.00  16  40.9  40.9  —  

 1995 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   24 February 1995  D. C. JewittJ. X. Luu ()  100  cubewano (cold)  46.2  0.13  4  40.1  52.2  —     29 March 1995  Siding Spring Observatory ()  109  cubewano?  42.4  0.00  1  42.4  42.4  —     3 April 1995  Mauna Kea Obs. ()  150  plutino?  39.5  0.12  4  34.8  44.2  —     3 April 1995  Mauna Kea Obs. ()  166  other TNO  42.9  0.09  23  39.0  46.8  —     6 April 1995  La Silla Obs. ()  109  cubewano?  41.3  0.00  1  41.3  41.3  —     30 May 1995  Mauna Kea Obs. ()  172  cubewano?  43.5  0.00  3  43.5  43.5  —     30 May 1995  Mauna Kea Obs. ()  94  plutino?  39.5  0.19  9  32.0  47.0  —     24 December 1995  Mauna Kea Obs. ()  83  other TNO  39.2  0.22  0  30.6  47.7  —  

 1996 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   14 January 1996  Spacewatch ()  77  centaur  35.8  0.62  11  13.6  58.0  —     21 May 1996  C. TrujilloD. C. JewittJ. X. Luu ()  178  cubewano (hot)  45.5  0.12  8  40.2  50.9  —     22 May 1996  Mauna Kea Obs. ()  94  plutino?  39.5  0.10  2  35.7  43.4  —     16 May 1996  Mauna Kea Obs. ()  119  plutino?  39.5  0.10  31  35.7  43.3  —     6 September 1996  D. L. Rabinowitz ()  173  other TNO  44.0  0.10  32  39.4  48.7  BR-mag: 1.56; taxonomy: IR  

 1997 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   8 February 1997  Mauna Kea Obs. ()  237  plutino?  39.4  0.08  19  36.3  42.5  —     3 April 1997  B. Gladman ()  98  cubewano (hot)  47.0  0.17  8  38.9  55.0  —     27 August 1997  D. C. JewittC. TrujilloJ. X. LuuK. Berney ()  204  cubewano (hot)  43.0  0.09  13  39.2  46.7  BR-mag: 1.68; taxonomy: RR     5 September 1997  Palomar Obs. ()  43  cubewano?  44.5  0.00  6  44.5  44.5  —     7 September 1997  B. Gladman ()  91  other TNO  41.8  0.05  30  39.7  44.0  —     6 September 1997  La Palma Obs. ()  162  cubewano (hot)  41.4  0.00  12  41.4  41.4  —     5 October 1997  Palomar Obs. ()  94  plutino?  39.3  0.19  9  32.0  46.6  —     26 October 1997  La Palma Obs. ()  68  cubewano?  43.3  0.00  1  43.3  43.3  —  

 1998 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   23 March 1998  Northfield Mount Hermon School ()  235  cubewano (hot)  41.6  0.02  10  40.6  42.5  BR-mag: 1.53; taxonomy: IR     29 April 1998  D. C. JewittJ. X. LuuC. TrujilloD. J. Tholen ()  100  other TNO  40.7  0.09  28  37.2  44.3  BR-mag: 1.06     21 April 1998  J. KormendyR. WainscoatD. J. TholenD. C. Jewitt ()  91  other TNO  37.9  0.06  25  35.8  40.0  —     22 April 1998  R. WainscoatJ. KormendyD. C. JewittJ. X. Luu ()  95  other TNO  41.3  0.10  17  37.3  45.2  —     28 April 1998  Mauna Kea Obs. ()  65  cubewano?  45.5  0.12  7  39.9  51.1  —     29 May 1998  Cerro Tololo Obs. ()  57  cubewano?  43.1  0.05  5  40.9  45.3  —     29 May 1998  Cerro Tololo Obs. ()  54  cubewano?  42.1  0.00  3  42.1  42.1  —     29 May 1998  Cerro Tololo Obs. ()  52  plutino?  39.5  0.21  6  31.1  47.9  —     29 May 1998  Cerro Tololo Obs. ()  57  cubewano?  45.2  0.00  4  45.2  45.2  —     29 May 1998  G. Bernstein ()  98  cubewano (cold)  44.2  0.04  1  42.3  46.0  BR-mag: 1.73; taxonomy: RR-IR     29 May 1998  G. Bernstein ()  115  cubewano (cold)  44.7  0.04  2  43.0  46.5  —     22 October 1998  M. W. Buie ()  103  plutino  39.4  0.22  9  30.8  48.1  BR-mag: 1.27; taxonomy: BR     18 November 1998  M. W. Buie ()  105  plutino  39.4  0.20  7  31.4  47.3  BR-mag: 1.32; taxonomy: IR-BR     18 November 1998  M. W. Buie ()  104  other TNO  39.0  0.04  2  37.4  40.6  BR-mag: 1.27; taxonomy: BR; binary: 91 km     19 November 1998  M. W. Buie ()  150  plutino  39.3  0.27  6  28.6  50.1  BR-mag: 1.31; taxonomy: BR     18 November 1998  M. W. Buie ()  148  cubewano (hot)  44.7  0.09  7  40.7  48.6  albedo: 0.054; binary: 123 km     18 November 1998  M. W. Buie ()  152  cubewano (cold)  43.3  0.04  1  41.5  45.1  BR-mag: 1.79; taxonomy: RR     18 November 1998  M. W. Buie ()  132  cubewano (cold)  45.0  0.11  2  39.9  50.2  —     18 November 1998  Kitt Peak Obs. ()  113  plutino?  39.5  0.18  5  32.4  46.6  —     19 November 1998  M. W. Buie ()  108  plutino  39.4  0.17  15  32.8  46.1  BR-mag: 1.26; taxonomy: BB-BR  

  1999–2007 

 List of unnumbered trans-Neptunian objects: 1999
 List of unnumbered trans-Neptunian objects: 2000
 List of unnumbered trans-Neptunian objects: 2001
 List of unnumbered trans-Neptunian objects: 2002
 List of unnumbered trans-Neptunian objects: 2003
 List of unnumbered trans-Neptunian objects: 2004
 List of unnumbered trans-Neptunian objects: 2005
 List of unnumbered trans-Neptunian objects: 2006
 List of unnumbered trans-Neptunian objects: 2007

 2008 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   6 January 2008  Mauna Kea Obs. ()  95  cubewano?  44.1  0.16  1  36.9  51.3  —     6 January 2008  P. A. Wiegert ()  257  other TNO  41.3  0.06  25  38.9  43.6  —     8 January 2008  Mauna Kea Obs. ()  254  centaur  32.3  0.38  43  20.1  44.5  —     11 May 2008  Mauna Kea Obs. ()  79  SDO  88.3  0.55  49  39.9  137  —     7 June 2008  Mauna Kea Obs. ()  91  other TNO  40.2  0.30  15  28.0  52.5  —     26 October 2008  L. H. Wasserman ()  207  res1:4  76.8  0.52  31  36.9  117  —     26 October 2008  Cerro Tololo Obs. ()  197  plutino?  39.5  0.24  33  29.9  49.1  —  

  2009–2018 

 List of unnumbered trans-Neptunian objects: 2009
 List of unnumbered trans-Neptunian objects: 2010
 List of unnumbered trans-Neptunian objects: 2011
 List of unnumbered trans-Neptunian objects: 2012
 List of unnumbered trans-Neptunian objects: 2013
 List of unnumbered trans-Neptunian objects: 2014
 List of unnumbered trans-Neptunian objects: 2015
 List of unnumbered trans-Neptunian objects: 2016
 List of unnumbered trans-Neptunian objects: 2017
 List of unnumbered trans-Neptunian objects: 2018

 2019 
 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   11 January 2019  Cerro Tololo Obs. ()  181  SDO  57.1  0.38  12  35.3  78.9  —     6 March 2019  Cerro Tololo Obs. ()  171  SDO  69.8  0.45  28  38.2  101  —     4 March 2019  Cerro Tololo Obs. ()  155  SDO  52.3  0.32  8  35.6  68.9  —     5 March 2019  Mauna Kea Obs. ()  187  SDO  52.4  0.26  12  38.9  66.0  —     6 January 2016  Mauna Kea Obs. ()  198  EDDO  973  0.95  18  46.7  1900  ETNO     5 March 2019  Mauna Kea Obs. ()  117  SDO  55.7  0.43  9  31.7  79.8  —     5 April 2019  Korea Microlensing Telescope Network-CTIO ()  130  cubewano (cold)  43.7  0.08  1  40.4  47.0  —     4 April 2019  Cerro Tololo Obs. ()  146  SDO  61.8  0.36  9  39.3  84.3  —     28 August 2019  Pan-STARRS ()  10  centaur  61.8  0.89  24  6.8  117  —     4 September 2019  Lowell Discovery Tel. ()  164  other TNO  42.0  0.17  20  34.7  49.3  —     26 September 2019  Cerro Tololo Obs. ()  192  SDO  74.5  0.50  21  36.9  112  —     24 September 2019  Cerro Tololo Obs. ()  213  SDO  119  0.70  15  35.4  203  —     7 October 2019  Pan-STARRS ()  10  centaur  33.2  0.80  5  6.6  59.9  —     27 October 2019  Pan-STARRS 2 ()  40  centaur  52.9  0.85  47  7.9  98.0  —  

 2020 
 List of unnumbered trans-Neptunian objects: 2020
 2021 

 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   7 February 2021  Pan-STARRS ()  20  centaur  332  0.97  9  10.6  654  —     17 February 2021  Mauna Kea Obs. ()  87  cubewano?  45.4  0.03  2  43.9  47.0  binary: 70 km     17 February 2021  Mauna Kea Obs. ()  98  cubewano?  43.8  0.04  3  41.9  45.7  binary: 93 km     16 February 2021  Mauna Kea Obs. ()  208  other TNO  50.9  0.18  23  41.6  60.2  —     16 February 2021  Mauna Kea Obs. ()  214  SDO  90.0  0.66  4  30.8  149  —     16 February 2021  Mauna Kea Obs. ()  307  centaur  79.4  0.65  3  27.9  131  —     10 March 2005  Apache Point-Sloan Digital Sky Survey ()  713  SDO  67.2  0.44  31  37.8  96.5  —     17 February 2021  Mauna Kea Obs. ()  144  cubewano?  43.3  0.05  3  41.2  45.4  binary: 119 km  17 February 2021Mauna Kea Obs. ()ETNO731.6330.93915.45044.4981418   5 March 2021  Lowell Discovery Tel. ()  279  centaur?  42.4  0.34  8  27.9  56.9  —     5 April 2021  Korea Microlensing Telescope Network-CTIO ()  90  cubewano?  60.5  0.33  12  40.9  80.1  —     12 April 2021  Korea Microlensing Telescope Network-CTIO ()  94  plutino?  39.2  0.09  17  35.9  42.6  —     12 April 2021  Korea Microlensing Telescope Network-CTIO ()  82  cubewano?  42.6  0.07  1  39.5  45.8  —     5 September 2021  Mauna Kea Obs.  200  sednoid  990.9  0.943  7.644  55.541  1926  —  

 2022 

 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   12 April 2021  Korea Microlensing Telescope Network-CTIO ()  202  other TNO  44.0  0.31  15  30.5  57.5  —     1 March 2020  Korea Microlensing Telescope Network-CTIO ()  112  cubewano?  44.1  0.08  7  40.8  47.5  —     12 April 2021  Korea Microlensing Telescope Network-CTIO ()  81  cubewano?  43.6  0.12  10  38.5  48.8  —     16 April 2021  Korea Microlensing Telescope Network-CTIO ()  114  cubewano?  42.7  0.14  2  36.7  48.6  —     16 April 2021  Korea Microlensing Telescope Network-CTIO ()  105  cubewano?  41.6  0.07  16  38.5  44.8  —  

 2023 

 Designation First Observed (discovered) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q   19 February 2023  Mount Lemmon Survey ()   damocloid 93.37  0.95  118.4  4.8  181.94  —  
 Ignored objects 
The Minor Planet Center does not include the following 111 objects with a semi-major axis larger than that of Neptune in its respective lists (see ). The data is sourced from the List of Known Trans-Neptunian Objects at Johnston's Archive.

 Designation D (km) Orbital description Remarks Refs Class a e i q Q   15  damocloid  53.71  0.9  119.38  2.4  104.9  albedo: 0.098; BR-mag: 1.37   385571 Otrera  70  NT  30.27  0.0  1.43  29.3  31.2  —   385695 Clete  91  NT  30.24  0.0  5.24  28.6  31.8  —     542  res2:9  82.52  0.5  7.54  34.2  130.8  —     118  NT  30.30  0.0  9.64  30.0  30.5  —     11  damocloid  34.67  0.8  148.84  4.9  64.4  —     10  damocloid  269.67  0.9  30.09  2.4  536.8  —     10  damocloid  52.24  0.9  68.28  2.2  102.1  —     48  damocloid  89.44  0.9  45.54  3.3  175.5  —     132  NT  30.36  0.0  1.32  29.4  31.3  albedo: 0.058     4  damocloid  75.18  0.9  17.58  2.6  147.7  —     209  other TNO  51.80  0.1  1.47  41.9  61.7  —     5  damocloid  598.67  0.9  58.49  2.6  1194.6  —     5  centaur  33.45  0.8  18.90  3.5  63.4  —     8  centaur  33.18  0.8  4.66  4.9  61.4  —     5  damocloid  100.79  0.9  165.58  2.3  199.2  —     11  damocloid  63.27  0.9  67.50  3.0  123.4  —     66  NT  30.22  0.0  24.95  28.2  32.2  —     9  damocloid  769.73  0.9  112.44  4.1  1535.3  —     7  damocloid  42.06  0.9  150.26  2.5  81.5  —     7  damocloid  37.18  0.9  172.14  3.7  70.6  —     127  NT  30.13  0.0  8.17  29.3  30.9  BR-mag: 1.31     6  damocloid  433.78  0.9  76.49  2.6  864.9  —     11  damocloid  35.00  0.9  28.73  2.6  67.3  —     4  damocloid  47.58  0.9  107.45  2.2  92.9  —     1.1  damocloid  31.35  0.9  8.74  1.4  61.3  —     10  damocloid  31.65  0.9  146.12  2.8  60.4  albedo: 0.048     2.3  damocloid  108.39  0.9  10.54  1.8  214.9  —     1  damocloid  49.29  0.9  29.25  2.6  95.9  —     16  centaur  176.57  0.9  99.89  5.3  347.7  albedo: 0.037     6  damocloid  62.30  0.9  105.23  3.6  120.9  albedo: 0.047     1  unusual  44.68  0.9  18.69  3.0  86.3  —     7  damocloid  70.04  0.9  53.36  2.6  137.4  albedo: 0.052     9  damocloid  2901.80  0.9  64.70  1.7  5801.8  —     115  NT  30.11  0.0  4.28  28.0  32.2  —     87  NT  30.30  0.0  29.34  27.7  32.8  BR-mag: 1.13     15  damocloid  292.27  0.9  110.38  3.1  581.4  —     1.9  damocloid  37.50  0.9  141.66  2.0  72.9  —     1.7  damocloid  45.11  0.9  1.17  1.4  88.8  —     5  damocloid  62.52  0.9  146.71  2.5  122.5  —     19  damocloid  501.79  0.9  70.90  4.8  998.7  —     126  NT  30.27  0.0  28.30  29.0  31.5  —     58  NT  30.12  0.0  20.85  27.9  32.3  —     2.4  damocloid  59.07  0.9  101.80  1.5  116.5  —     2.6  damocloid  136.08  0.9  5.29  1.3  270.8  —     2.6  damocloid  62.51  0.9  97.11  2.8  122.2  —     182  NT  30.26  0.1  6.66  26.5  34.0  —     4  damocloid  81.20  0.9  154.64  2.5  159.8  BR-mag: 1.30     70  NT  30.19  0.0  7.45  28.6  31.7  —     72  NT  30.21  0.0  10.12  29.3  31.0  —     1.9  unusual  34.10  0.9  14.29  3.0  65.1  —     50  NT  30.23  0.0  18.61  27.7  32.6  —     96  NT  30.24  0.0  13.14  28.2  32.2  —     91  NT  30.17  0.0  31.21  27.5  32.7  —     9  damocloid  32.79  0.8  170.75  4.3  61.2  BR-mag: 1.38     12  damocloid  44.84  0.9  92.34  4.5  85.1  —     90  NT  30.21  0.1  18.84  27.1  33.2  —     57  NT  30.19  0.0  19.41  28.1  32.2  —     88  NT  30.14  0.0  29.51  28.6  31.6  —     96  NT  30.16  0.0  33.67  27.2  33.0  —     96  NT  30.17  0.0  35.75  28.8  31.5  —     6  damocloid  72.01  0.9  101.53  3.2  140.7  —     79  NT  30.27  0.0  30.82  27.3  33.2  —     8  damocloid  456.25  0.9  156.12  4.9  907.5  —     8  damocloid  81.07  0.9  91.78  2.7  159.3  —     3  centaur  35.02  0.8  3.11  5.2  64.8  —     38  NT  30.16  0.0  30.75  27.9  32.3  —     5  damocloid  54.15  0.9  91.21  2.3  105.9  —     13  centaur  144.82  0.9  57.95  5.0  284.5  —     146  NT  30.19  0.0  38.93  29.2  31.1  —     72  NT  30.17  0.0  16.84  27.5  32.7  —     87  NT  30.16  0.0  5.00  28.6  31.6  —     61  NT  30.11  0.0  17.12  27.9  32.3  —     4  damocloid  36.26  0.9  157.48  3.5  68.9  —     6  damocloid  62.74  0.9  22.17  2.6  122.7  —     3  damocloid  47.35  0.9  129.74  3.0  91.7  —     1.5  damocloid  66.08  0.9  170.96  2.7  129.4  —     1.3  damocloid  138.08  0.9  3.46  1.5  274.6  —     13  damocloid  31.04  0.9  105.22  2.9  59.1  —     4  unusual  30.39  0.8  11.17  4.1  56.6  —     2.3  damocloid  35.62  0.9  87.27  1.8  69.4  —     5  damocloid  182.37  0.9  152.43  2.9  361.8  —     4  damocloid  33.09  0.9  83.42  2.6  63.5  —     1.9  damocloid  43.28  0.9  74.86  2.2  84.2  —     6  damocloid  32.90  0.8  160.74  3.8  61.9  —     9  damocloid  3549.25  0.9  55.71  4.4  7094.0  —     13  damocloid  67.56  0.9  65.82  3.1  131.9  —     1.7  damocloid  58.83  0.9  94.75  1.7  115.9  —     1.6  damocloid  249.22  0.9  152.06  1.8  496.5  —     1.1  damocloid  34.05  0.9  2.46  1.5  66.5  —     0.3  Amor  292.68  0.9  108.28  1.2  584.1  —     5  damocloid  125.35  0.9  144.20  3.1  247.5  —     35  centaur  30.10  0.7  90.46  7.6  52.5  —     7  damocloid  147.73  0.9  88.98  4.2  291.1  —     2.2  damocloid  31.83  0.9  81.34  2.3  61.2  —     3  damocloid  95.00  0.9  68.21  1.6  188.4  —     11  damocloid  93.45  0.9  46.86  3.7  183.2  —     5  damocloid  377.26  0.9  68.30  3.8  750.6  —     5  damocloid  154.17  0.9  90.97  2.9  305.3  —     0.18  Amor  102.92  0.9  139.75  1.0  204.7  —     2.5  damocloid  37.22  0.9  22.00  2.5  71.8  —     6  damocloid  34.86  0.8  103.84  4.1  65.5  —     1.8  damocloid  54.98  0.9  82.46  2.5  107.4  —     7  damocloid  648.83  0.9  76.83  4.8  1292.8  —     9  damocloid  35.37  0.8  148.55  3.9  66.8  —     3  damocloid  86.77  0.9  125.10  3.4  170.1  —     25  damocloid  318.11  0.9  84.90  4.5  631.6  —     6  damocloid  368.62  0.9  22.82  2.7  734.4  —     2.7  damocloid  114.60  0.9  103.17  4.0  225.1  —     1.0  damocloid  37.71  0.9  154.92  1.8  73.5  —     3  damocloid  39.02  0.8  96.91  3.9  74.1  —  

 Related pages 
 List of unnumbered minor planets
 List of Solar System objects most distant from the Sun

 Notes 


 References 


 Other websites 
 How many dwarf planets are there in the outer solar system?, Michael Brown, Caltech
 OSSOS TNODB by the Outer Solar System Origins Survey
 Known extreme outer solar system objects, Scott Sheppard, Carnegie Science Center

Category:Astronomical objects