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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 .[ 2] [ 3] 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 . As of April 2022[update] , 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).[ a]
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 .[ 1] 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
100
200
300
400
500
600
700
800
'92
'94
'96
'98
'00
'02
'04
'06
'08
'10
'12
'14
'16
'18
'20
'22
TNOs by year of principle designation since 1992 (objects with
a < 30.1 AU excluded). As of April 2022
[update] , there are
3,141 unnumbered TNOs and
783 numbered TNOs (Pluto from 1930 is not shown)
[ 2] [ 3]
Numbered TNOs: 901 obj. (22.3%)
Unnumbered TNOs: 3,141 obj. (77.7%)
List
1993
1994
1995
1996
1997
1998
Designation
First Observed (discovered)
D (km)
Orbital description
Remarks
Refs
Date
Observer (Site )
Class
a (AU )
e
i (° )
q (AU)
Q (AU)
1998 FS144
23 March 1998
Northfield Mount Hermon School (807 )
212
cubewano (hot )
41.6
0.02
10
40.6
42.5
BR-mag: 1.53; taxonomy : IR
MPC · JPL
1998 HL151
29 April 1998
D. C. Jewitt J. X. Luu C. Trujillo D. J. Tholen (568 )
88
other TNO
40.7
0.09
28
37.2
44.3
BR-mag: 1.06
MPC · JPL
1998 HN151
21 April 1998
J. Kormendy R. Wainscoat D. J. Tholen D. C. Jewitt (568 )
80
other TNO
37.9
0.06
25
35.8
40.0
—
MPC · JPL
1998 HO151
22 April 1998
R. Wainscoat J. Kormendy D. C. JewittJ. X. Luu (568 )
108
other TNO
41.3
0.10
17
37.3
45.2
—
MPC · JPL
1998 HR151
28 April 1998
Mauna Kea Obs. (568 )
89
cubewano ?
45.5
0.12
7
39.9
51.1
—
MPC · JPL
1998 KD66
29 May 1998
Cerro Tololo Obs. (807 )
79
cubewano?
43.1
0.05
5
40.9
45.3
—
MPC · JPL
1998 KE66
29 May 1998
Cerro Tololo Obs. (807 )
54
cubewano?
42.1
0.00
3
42.1
42.1
—
MPC · JPL
1998 KF66
29 May 1998
Cerro Tololo Obs. (807 )
53
plutino ?
39.5
0.21
6
31.1
47.9
—
MPC · JPL
1998 KG66
29 May 1998
Cerro Tololo Obs. (807 )
56
cubewano ?
45.2
0.00
4
45.2
45.2
—
MPC · JPL
1998 KS65
29 May 1998
G. Bernstein (807 )
100
cubewano (cold )
44.2
0.04
1
42.3
46.0
BR-mag: 1.73; taxonomy : RR-IR
MPC · JPL
1998 KY61
29 May 1998
G. Bernstein (807 )
118
cubewano (cold)
44.7
0.04
2
43.0
46.5
—
MPC · JPL
1998 UR43
22 October 1998
M. W. Buie (695 )
106
plutino
39.4
0.22
9
30.8
48.1
BR-mag: 1.27; taxonomy : BR
MPC · JPL
1998 WS31
18 November 1998
M. W. Buie (695 )
108
plutino
39.4
0.20
7
31.4
47.3
BR-mag: 1.32; taxonomy: IR-BR
MPC · JPL
1998 WV24
18 November 1998
M. W. Buie (695 )
85
other TNO
39.0
0.04
2
37.4
40.6
BR-mag: 1.27; taxonomy : BR; binary : 91 km
MPC · JPL
1998 WV31
19 November 1998
M. W. Buie (695 )
153
plutino
39.3
0.27
6
28.6
50.1
BR-mag: 1.31; taxonomy: BR
MPC · JPL
1998 WW31
18 November 1998
M. W. Buie (695 )
148
cubewano (hot )
44.7
0.09
7
40.7
48.6
albedo: 0.054; binary : 123 km
MPC · JPL
1998 WX24
18 November 1998
M. W. Buie (695 )
155
cubewano (cold )
43.3
0.04
1
41.5
45.1
BR-mag: 1.79; taxonomy : RR
MPC · JPL
1998 WY31
18 November 1998
M. W. Buie (695 )
136
cubewano (cold)
45.0
0.11
2
39.9
50.2
—
MPC · JPL
1998 WZ24
18 November 1998
Kitt Peak Obs. (695 )
116
plutino ?
39.5
0.18
5
32.4
46.6
—
MPC · JPL
1998 WZ31
19 November 1998
M. W. Buie (695 )
116
plutino
39.4
0.17
15
32.8
46.1
BR-mag: 1.26; taxonomy : BB-BR
MPC · JPL
1999–2007
2008
2009–2018
2019
2020
2021
2022
Designation
First Observed (discovered)
D (km)
Orbital description
Remarks
Refs
Date
Observer (Site )
Class
a (AU )
e
i (° )
q (AU)
Q (AU)
2022 FA7
12 April 2021
Korea Microlensing Telescope Network-CTIO (W93 )
202
other TNO
44.0
0.31
15
30.5
57.5
—
MPC · JPL
2022 FR6
1 March 2020
Korea Microlensing Telescope Network-CTIO (W93 )
112
cubewano ?
44.1
0.08
7
40.8
47.5
—
MPC · JPL
2022 GP4
12 April 2021
Korea Microlensing Telescope Network-CTIO (W93 )
81
cubewano ?
43.6
0.12
10
38.5
48.8
—
MPC · JPL
2022 GY3
16 April 2021
Korea Microlensing Telescope Network-CTIO (W93 )
114
cubewano ?
42.7
0.14
2
36.7
48.6
—
MPC · JPL
2022 GZ3
16 April 2021
Korea Microlensing Telescope Network-CTIO (W93 )
105
cubewano ?
41.6
0.07
16
38.5
44.8
—
MPC · JPL
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 § top ) .[ 2] [ 3] [ a] The data is sourced from the List of Known Trans-Neptunian Objects at Johnston's Archive.[ 1]
See also
Notes
^ a b According to Johnston's Archive,[ 1] there are 50+ objects with a semi-major axis larger than 30.1 AU that are excluded from the two MPC sources. These ignored objects are the damocloids and the Neptune trojans , as well as three unusual objects 2003 UY283 (MPC /JPL ), 2004 CM111 (MPC /JPL ) and 2015 RL277 (MPC /JPL ).
References
External links
Consensus Candidate (D+1σ ≥ 700 km or H ≤ 4.2)