List of unnumbered trans-Neptunian objects explained

TNOs: a vs. e (semi-log plot, 30–1000 AU):
Distribution of 3,590 listed TNO objects (with a > 30.1 AU, including candidates) by subclass from Johnston's Archive (hover)

This is a list of unnumbered trans-Neptunian objects (TNOs) first observed since 1993 and grouped by the year of principal provisional designation. The data is sourced from the Minor Planet Center's (MPC) List of Trans Neptunian Objects and List Of Centaurs and Scattered-Disk Objects. These objects will eventually be numbered as secured discoveries with an official discoverer determined by the MPC. Until then, additional observations are needed to sufficiently decrease an object's orbital uncertainty., there are 3,141 unnumbered objects, defined here as minor planets with a semi-major axis larger than 30.1 AU (Neptune's average orbital distance from the Sun).

The list also contains information from "Johnston's Archive", such as an object's diameter, its dynamical class and binary status with the satellite's diameter, as well as its albedo, spectral taxonomy and B–R color index. Members of the extreme trans-Neptunian objects (ESDOs, EDDOs and sednoids) – with a semi-major axis greater than 150 AU and perihelion greater than 30 AU – are also identified.

Statistics

List

1993

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 15 September 1993 Mauna Kea Obs. align=center 48 35.1 0.06 align=center 4 33.2 37.0

1994

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 13 March 1994 J. X. Luu
D. C. Jewitt
align=center 100 cubewano (cold) 45.6 0.11 align=center 1 40.4 50.8 BR-mag: 1.65
align=center 3 October 1994 Mauna Kea Obs. align=center 204 cubewano (hot) 42.3 0.00 align=center 7 42.3 42.3
align=center 8 October 1994 La Silla Obs. align=center 137 cubewano? 42.4 0.00 align=center 2 42.4 42.4
align=center 3 October 1994 Mauna Kea Obs. align=center 166 other TNO 40.9 0.00 align=center 16 40.9 40.9

1995

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 24 February 1995 D. C. Jewitt
J. X. Luu
align=center 100 cubewano (cold) 46.2 0.13 align=center 4 40.1 52.2
align=center 29 March 1995 Siding Spring Observatory align=center 109 cubewano? 42.4 0.00 align=center 1 42.4 42.4
align=center 3 April 1995 Mauna Kea Obs. align=center 150 plutino? 39.5 0.12 align=center 4 34.8 44.2
align=center 3 April 1995 Mauna Kea Obs. align=center 166 other TNO 42.9 0.09 align=center 23 39.0 46.8
align=center 6 April 1995 La Silla Obs. align=center 109 cubewano? 41.3 0.00 align=center 1 41.3 41.3
align=center 30 May 1995 Mauna Kea Obs. align=center 172 cubewano? 43.5 0.00 align=center 3 43.5 43.5
align=center 30 May 1995 Mauna Kea Obs. align=center 94 plutino? 39.5 0.19 align=center 9 32.0 47.0
align=center 24 December 1995 Mauna Kea Obs. align=center 83 other TNO 39.2 0.22 align=center 0 30.6 47.7

1996

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 14 January 1996 Spacewatch align=center 77 35.8 0.62 align=center 11 13.6 58.0
align=center 21 May 1996 C. Trujillo
D. C. Jewitt
J. X. Luu
align=center 178 cubewano (hot) 45.5 0.12 align=center 8 40.2 50.9
align=center 22 May 1996 Mauna Kea Obs. align=center 94 plutino? 39.5 0.10 align=center 2 35.7 43.4
align=center 16 May 1996 Mauna Kea Obs. align=center 119 plutino? 39.5 0.10 align=center 31 35.7 43.3
align=center 6 September 1996 D. L. Rabinowitz align=center 173 other TNO 44.0 0.10 align=center 32 39.4 48.7 BR-mag: 1.56; taxonomy: IR

1997

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 8 February 1997 Mauna Kea Obs. align=center 237 plutino? 39.4 0.08 align=center 19 36.3 42.5
align=center 3 April 1997 B. Gladman align=center 98 cubewano (hot) 47.0 0.17 align=center 8 38.9 55.0
align=center 27 August 1997 D. C. Jewitt
C. Trujillo
J. X. Luu
K. Berney
align=center 204 cubewano (hot) 43.0 0.09 align=center 13 39.2 46.7 BR-mag: 1.68; taxonomy: RR
align=center 5 September 1997 Palomar Obs. align=center 43 cubewano? 44.5 0.00 align=center 6 44.5 44.5
align=center 7 September 1997 B. Gladman align=center 91 other TNO 41.8 0.05 align=center 30 39.7 44.0
align=center 6 September 1997 La Palma Obs. align=center 162 cubewano (hot) 41.4 0.00 align=center 12 41.4 41.4
align=center 5 October 1997 Palomar Obs. align=center 94 plutino? 39.3 0.19 align=center 9 32.0 46.6
align=center 26 October 1997 La Palma Obs. align=center 68 cubewano? 43.3 0.00 align=center 1 43.3 43.3

1998

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 23 March 1998 Northfield Mount Hermon School align=center 235 cubewano (hot) 41.6 0.02 align=center 10 40.6 42.5 BR-mag: 1.53; taxonomy: IR
align=center 29 April 1998 D. C. Jewitt
J. X. Luu
C. Trujillo
D. J. Tholen
align=center 100 other TNO 40.7 0.09 align=center 28 37.2 44.3 BR-mag: 1.06
align=center 21 April 1998 J. Kormendy
R. Wainscoat
D. J. Tholen
D. C. Jewitt
align=center 91 other TNO 37.9 0.06 align=center 25 35.8 40.0
align=center 22 April 1998 R. Wainscoat
J. Kormendy
D. C. Jewitt
J. X. Luu
align=center 95 other TNO 41.3 0.10 align=center 17 37.3 45.2
align=center 28 April 1998 Mauna Kea Obs. align=center 65 cubewano? 45.5 0.12 align=center 7 39.9 51.1
align=center 29 May 1998 Cerro Tololo Obs. align=center 57 cubewano? 43.1 0.05 align=center 5 40.9 45.3
align=center 29 May 1998 Cerro Tololo Obs. align=center 54 cubewano? 42.1 0.00 align=center 3 42.1 42.1
align=center 29 May 1998 Cerro Tololo Obs. align=center 52 plutino? 39.5 0.21 align=center 6 31.1 47.9
align=center 29 May 1998 Cerro Tololo Obs. align=center 57 cubewano? 45.2 0.00 align=center 4 45.2 45.2
align=center 29 May 1998 G. Bernstein align=center 98 cubewano (cold) 44.2 0.04 align=center 1 42.3 46.0 BR-mag: 1.73; taxonomy: RR-IR
align=center 29 May 1998 G. Bernstein align=center 115 cubewano (cold) 44.7 0.04 align=center 2 43.0 46.5
align=center 22 October 1998 M. W. Buie align=center 103 39.4 0.22 align=center 9 30.8 48.1 BR-mag: 1.27; taxonomy: BR
align=center 18 November 1998 M. W. Buie align=center 105 plutino 39.4 0.20 align=center 7 31.4 47.3 BR-mag: 1.32; taxonomy: IR-BR
align=center 18 November 1998 M. W. Buie align=center 104 other TNO 39.0 0.04 align=center 2 37.4 40.6 BR-mag: 1.27; taxonomy: BR; binary: 91 km
align=center 19 November 1998 M. W. Buie align=center 150 39.3 0.27 align=center 6 28.6 50.1 BR-mag: 1.31; taxonomy: BR
align=center 18 November 1998 M. W. Buie align=center 148 cubewano (hot) 44.7 0.09 align=center 7 40.7 48.6 albedo: 0.054; binary: 123 km
align=center 18 November 1998 M. W. Buie align=center 152 cubewano (cold) 43.3 0.04 align=center 1 41.5 45.1 BR-mag: 1.79; taxonomy: RR
align=center 18 November 1998 M. W. Buie align=center 132 cubewano (cold) 45.0 0.11 align=center 2 39.9 50.2
align=center 18 November 1998 Kitt Peak Obs. align=center 113 plutino? 39.5 0.18 align=center 5 32.4 46.6
align=center 19 November 1998 M. W. Buie align=center 108 plutino 39.4 0.17 align=center 15 32.8 46.1 BR-mag: 1.26; taxonomy: BB-BR

1999–2007

2008

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 6 January 2008 Mauna Kea Obs. align=center 95 cubewano? 44.1 0.16 align=center 1 36.9 51.3
align=center 6 January 2008 P. A. Wiegert align=center 257 other TNO 41.3 0.06 align=center 25 38.9 43.6
align=center 8 January 2008 Mauna Kea Obs. align=center 254 32.3 0.38 align=center 43 20.1 44.5
align=center 11 May 2008 Mauna Kea Obs. align=center 79 88.3 0.55 align=center 49 39.9 137
align=center 7 June 2008 Mauna Kea Obs. align=center 91 other TNO 40.2 0.30 align=center 15 28.0 52.5
align=center 26 October 2008 L. H. Wasserman align=center 207 76.8 0.52 align=center 31 36.9 117
align=center 26 October 2008 Cerro Tololo Obs. align=center 197 plutino? 39.5 0.24 align=center 33 29.9 49.1

2009–2018

2019

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 11 January 2019 Cerro Tololo Obs. align=center 181 57.1 0.38 align=center 12 35.3 78.9
align=center 6 March 2019 Cerro Tololo Obs. align=center 171 SDO 69.8 0.45 align=center 28 38.2 101
align=center 4 March 2019 Cerro Tololo Obs. align=center 155 SDO 52.3 0.32 align=center 8 35.6 68.9
align=center 5 March 2019 Mauna Kea Obs. align=center 187 SDO 52.4 0.26 align=center 12 38.9 66.0
align=center 6 January 2016 Mauna Kea Obs. align=center 198 973 0.95 align=center 18 46.7 1900
align=center 5 March 2019 Mauna Kea Obs. align=center 117 55.7 0.43 align=center 9 31.7 79.8
align=center 5 April 2019 Korea Microlensing Telescope Network-CTIO align=center 130 cubewano (cold) 43.7 0.08 align=center 1 40.4 47.0
align=center 4 April 2019 Cerro Tololo Obs. align=center 146 61.8 0.36 align=center 9 39.3 84.3
align=center 28 August 2019 Pan-STARRS align=center 10 61.8 0.89 align=center 24 6.8 117
align=center 4 September 2019 Lowell Discovery Tel. align=center 164 other TNO 42.0 0.17 align=center 20 34.7 49.3
align=center 26 September 2019 Cerro Tololo Obs. align=center 192 74.5 0.50 align=center 21 36.9 112
align=center 24 September 2019 Cerro Tololo Obs. align=center 213 SDO 119 0.70 align=center 15 35.4 203
align=center 7 October 2019 Pan-STARRS align=center 10 33.2 0.80 align=center 5 6.6 59.9
align=center 27 October 2019 Pan-STARRS 2 align=center 40 centaur 52.9 0.85 align=center 47 7.9 98.0

2021

DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
DateObserver
(Site)
Classa
ei
q
Q
7 February 2021 Pan-STARRS 20 332 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 90.0 0.66 4 30.8 149
16 February 2021 Mauna Kea Obs. 307 79.4 0.65 3 27.9 131
10 March 2005 Apache Point-Sloan Digital Sky Survey 713 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 82 cubewano? 42.6 0.07 1 39.5 45.8
5 September 2021 200 990.9 0.943 7.644 55.541 1926

2022

width= 110 rowspan=2 DesignationFirst Observed (discovered)D (km)Orbital descriptionRemarksRefs
width=55 DateObserver
(Site)
Classa
ei
q
Q
align=center 12 April 2021 Korea Microlensing Telescope Network-CTIO align=center 202 other TNO 44.0 0.31 align=center 15 30.5 57.5
align=center 1 March 2020 Korea Microlensing Telescope Network-CTIO align=center 112 cubewano? 44.1 0.08 align=center 7 40.8 47.5
align=center 12 April 2021 Korea Microlensing Telescope Network-CTIO align=center 81 cubewano? 43.6 0.12 align=center 10 38.5 48.8
align=center 16 April 2021 Korea Microlensing Telescope Network-CTIO align=center 114 cubewano? 42.7 0.14 align=center 2 36.7 48.6
align=center 16 April 2021 Korea Microlensing Telescope Network-CTIO align=center 105 cubewano? 41.6 0.07 align=center 16 38.5 44.8

2023

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.

width= 110 rowspan=2 DesignationD (km)Orbital descriptionRemarksRefs
Classa
ei
q
Q
align=center 15 53.71 0.9 align=center 119.38 2.4 104.9 albedo: 0.098; BR-mag: 1.37
align=center 70 30.27 0.0 align=center 1.43 29.3 31.2
align=center 91 30.24 0.0 align=center 5.24 28.6 31.8
align=center 542 82.52 0.5 align=center 7.54 34.2 130.8
align=center 118 30.30 0.0 align=center 9.64 30.0 30.5
align=center 11 34.67 0.8 align=center 148.84 4.9 64.4
align=center 10 269.67 0.9 align=center 30.09 2.4 536.8
align=center 10 52.24 0.9 align=center 68.28 2.2 102.1
align=center 48 89.44 0.9 align=center 45.54 3.3 175.5
align=center 132 30.36 0.0 align=center 1.32 29.4 31.3 albedo: 0.058
align=center 4 75.18 0.9 align=center 17.58 2.6 147.7
align=center 209 other TNO 51.80 0.1 align=center 1.47 41.9 61.7
align=center 5 598.67 0.9 align=center 58.49 2.6 1194.6
align=center 5 33.45 0.8 align=center 18.90 3.5 63.4
align=center 8 33.18 0.8 align=center 4.66 4.9 61.4
align=center 5 100.79 0.9 align=center 165.58 2.3 199.2
align=center 11 63.27 0.9 align=center 67.50 3.0 123.4
align=center 66 30.22 0.0 align=center 24.95 28.2 32.2
align=center 9 769.73 0.9 align=center 112.44 4.1 1535.3
align=center 7 42.06 0.9 align=center 150.26 2.5 81.5
align=center 7 37.18 0.9 align=center 172.14 3.7 70.6
align=center 127 30.13 0.0 align=center 8.17 29.3 30.9 BR-mag: 1.31
align=center 6 433.78 0.9 align=center 76.49 2.6 864.9
align=center 11 35.00 0.9 align=center 28.73 2.6 67.3
align=center 4 47.58 0.9 align=center 107.45 2.2 92.9
align=center 1.1 31.35 0.9 align=center 8.74 1.4 61.3
align=center 10 31.65 0.9 align=center 146.12 2.8 60.4 albedo: 0.048
align=center 2.3 108.39 0.9 align=center 10.54 1.8 214.9
align=center 1 49.29 0.9 align=center 29.25 2.6 95.9
align=center 16 176.57 0.9 align=center 99.89 5.3 347.7 albedo: 0.037
align=center 6 62.30 0.9 align=center 105.23 3.6 120.9 albedo: 0.047
align=center 1 44.68 0.9 align=center 18.69 3.0 86.3
align=center 7 70.04 0.9 align=center 53.36 2.6 137.4 albedo: 0.052
align=center 9 2901.80 0.9 align=center 64.70 1.7 5801.8
align=center 115 30.11 0.0 align=center 4.28 28.0 32.2
align=center 87 30.30 0.0 align=center 29.34 27.7 32.8 BR-mag: 1.13
align=center 15 292.27 0.9 align=center 110.38 3.1 581.4
align=center 1.9 37.50 0.9 align=center 141.66 2.0 72.9
align=center 1.7 45.11 0.9 align=center 1.17 1.4 88.8
align=center 5 62.52 0.9 align=center 146.71 2.5 122.5
align=center 19 501.79 0.9 align=center 70.90 4.8 998.7
align=center 126 30.27 0.0 align=center 28.30 29.0 31.5
align=center 58 30.12 0.0 align=center 20.85 27.9 32.3
align=center 2.4 59.07 0.9 align=center 101.80 1.5 116.5
align=center 2.6 136.08 0.9 align=center 5.29 1.3 270.8
align=center 2.6 62.51 0.9 align=center 97.11 2.8 122.2
align=center 182 30.26 0.1 align=center 6.66 26.5 34.0
align=center 4 81.20 0.9 align=center 154.64 2.5 159.8 BR-mag: 1.30
align=center 70 30.19 0.0 align=center 7.45 28.6 31.7
align=center 72 30.21 0.0 align=center 10.12 29.3 31.0
align=center 1.9 34.10 0.9 align=center 14.29 3.0 65.1
align=center 50 30.23 0.0 align=center 18.61 27.7 32.6
align=center 96 30.24 0.0 align=center 13.14 28.2 32.2
align=center 91 30.17 0.0 align=center 31.21 27.5 32.7
align=center 9 32.79 0.8 align=center 170.75 4.3 61.2 BR-mag: 1.38
align=center 12 44.84 0.9 align=center 92.34 4.5 85.1
align=center 90 30.21 0.1 align=center 18.84 27.1 33.2
align=center 57 30.19 0.0 align=center 19.41 28.1 32.2
align=center 88 30.14 0.0 align=center 29.51 28.6 31.6
align=center 96 30.16 0.0 align=center 33.67 27.2 33.0
align=center 96 30.17 0.0 align=center 35.75 28.8 31.5
align=center 6 72.01 0.9 align=center 101.53 3.2 140.7
align=center 79 30.27 0.0 align=center 30.82 27.3 33.2
align=center 8 456.25 0.9 align=center 156.12 4.9 907.5
align=center 8 81.07 0.9 align=center 91.78 2.7 159.3
align=center 3 35.02 0.8 align=center 3.11 5.2 64.8
align=center 38 30.16 0.0 align=center 30.75 27.9 32.3
align=center 5 54.15 0.9 align=center 91.21 2.3 105.9
align=center 13 144.82 0.9 align=center 57.95 5.0 284.5
align=center 146 30.19 0.0 align=center 38.93 29.2 31.1
align=center 72 30.17 0.0 align=center 16.84 27.5 32.7
align=center 87 30.16 0.0 align=center 5.00 28.6 31.6
align=center 61 30.11 0.0 align=center 17.12 27.9 32.3
align=center 4 36.26 0.9 align=center 157.48 3.5 68.9
align=center 6 62.74 0.9 align=center 22.17 2.6 122.7
align=center 3 47.35 0.9 align=center 129.74 3.0 91.7
align=center 1.5 66.08 0.9 align=center 170.96 2.7 129.4
align=center 1.3 138.08 0.9 align=center 3.46 1.5 274.6
align=center 13 31.04 0.9 align=center 105.22 2.9 59.1
align=center 4 30.39 0.8 align=center 11.17 4.1 56.6
align=center 2.3 35.62 0.9 align=center 87.27 1.8 69.4
align=center 5 182.37 0.9 align=center 152.43 2.9 361.8
align=center 4 33.09 0.9 align=center 83.42 2.6 63.5
align=center 1.9 43.28 0.9 align=center 74.86 2.2 84.2
align=center 6 32.90 0.8 align=center 160.74 3.8 61.9
align=center 9 3549.25 0.9 align=center 55.71 4.4 7094.0
align=center 13 67.56 0.9 align=center 65.82 3.1 131.9
align=center 1.7 58.83 0.9 align=center 94.75 1.7 115.9
align=center 1.6 249.22 0.9 align=center 152.06 1.8 496.5
align=center 1.1 34.05 0.9 align=center 2.46 1.5 66.5
align=center 0.3 292.68 0.9 align=center 108.28 1.2 584.1
align=center 5 125.35 0.9 align=center 144.20 3.1 247.5
align=center 35 30.10 0.7 align=center 90.46 7.6 52.5
align=center 7 147.73 0.9 align=center 88.98 4.2 291.1
align=center 2.2 31.83 0.9 align=center 81.34 2.3 61.2
align=center 3 95.00 0.9 align=center 68.21 1.6 188.4
align=center 11 93.45 0.9 align=center 46.86 3.7 183.2
align=center 5 377.26 0.9 align=center 68.30 3.8 750.6
align=center 5 154.17 0.9 align=center 90.97 2.9 305.3
align=center 0.18 102.92 0.9 align=center 139.75 1.0 204.7
align=center 2.5 37.22 0.9 align=center 22.00 2.5 71.8
align=center 6 34.86 0.8 align=center 103.84 4.1 65.5
align=center 1.8 54.98 0.9 align=center 82.46 2.5 107.4
align=center 7 648.83 0.9 align=center 76.83 4.8 1292.8
align=center 9 35.37 0.8 align=center 148.55 3.9 66.8
align=center 3 86.77 0.9 align=center 125.10 3.4 170.1
align=center 25 318.11 0.9 align=center 84.90 4.5 631.6
align=center 6 368.62 0.9 align=center 22.82 2.7 734.4
align=center 2.7 114.60 0.9 align=center 103.17 4.0 225.1
align=center 1.0 37.71 0.9 align=center 154.92 1.8 73.5
align=center 3 39.02 0.8 align=center 96.91 3.9 74.1

See also

External links