List of unnumbered trans-Neptunian objects: 2003

The following is a partial list of unnumbered trans-Neptunian objects for principal designations assigned within 2003. As of April 2026^[update], it contains a total of 115 bodies.^[1]^[2]^[3]^[4] For more information see the description on the main page. Also see list for the previous and next year.

[1]

[2]

[3]

[4]

Designation	First Observed (discovered)		D (km)	Orbital description						Remarks	Refs
Designation	Date	Observer (Site)	D (km)	Class	a (AU)	e	i (°)	q (AU)	Q (AU)	Remarks	Refs
2003 BF₉₁	27 January 2003	Hubble Space Telescope (250)	16	cubewano?	42.7	0.01	2	42.1	43.4	—	MPC · JPL
2003 BG₉₁	27 January 2003	Hubble Space Telescope (250)	25	cubewano?	43.4	0.10	3	39.1	47.8	—	MPC · JPL
2003 BH₉₁	27 January 2003	Hubble Space Telescope (250)	14	cubewano?	44.0	0.03	2	42.6	45.4	—	MPC · JPL
2003 FA₁₃₀	24 March 2003	Mauna Kea Obs. (568)	121	cubewano (cold)	42.5	0.03	0	41.2	43.8	—	MPC · JPL
2003 FB₁₃₀	24 March 2003	Mauna Kea Obs. (568)	132	other TNO	43.0	0.11	24	38.2	47.8	—	MPC · JPL
2003 FD₁₂₈	31 March 2003	M. W. Buie (695)	178	cubewano (hot)	38.1	0.02	5	37.4	38.9	—	MPC · JPL
2003 FH₁₂₇	30 March 2003	Kitt Peak Obs. (695)	167	cubewano (cold)	44.8	0.08	0	41.1	48.5	—	MPC · JPL
2003 FH₁₂₉	30 March 2003	M. W. Buie (695)	122	centaur	70.1	0.61	19	27.6	113	—	MPC · JPL
2003 FJ₁₂₇	30 March 2003	M. W. Buie (695)	132	other TNO	44.7	0.26	23	33.1	56.3	—	MPC · JPL
2003 FL₁₂₇	31 March 2003	M. W. Buie (695)	260	plutino	39.1	0.24	4	29.7	48.5	—	MPC · JPL
2003 FM₁₂₇	31 March 2003	M. W. Buie (695)	126	cubewano (cold)	43.7	0.06	4	41.2	46.2	—	MPC · JPL
2003 FZ₁₂₉	24 March 2003	Mauna Kea Obs. (568)	125	SDO	61.6	0.38	6	38.1	85.1	BR-mag: 1.32; taxonomy: BR	MPC · JPL
2003 GF₅₅	1 April 2003	M. W. Buie (695)	246	cubewano (hot)	45.4	0.05	6	43.1	47.8	—	MPC · JPL
2003 GM₅₃	1 April 2003	Kitt Peak Obs. (695)	143	cubewano?	44.5	0.05	7	42.2	46.7	—	MPC · JPL
2003 HA₅₇	26 April 2003	Mauna Kea Obs. (568)	113	plutino	39.4	0.17	28	32.7	46.1	—	MPC · JPL
2003 HF₅₇	26 April 2003	Mauna Kea Obs. (568)	90	plutino	39.3	0.19	1	31.8	46.8	—	MPC · JPL
2003 HH₅₇	26 April 2003	Mauna Kea Obs. (568)	110	cubewano (cold)	43.9	0.08	1	40.3	47.6	—	MPC · JPL
2003 HJ₅₇	26 April 2003	Mauna Kea Obs. (568)	103	plutino?	39.7	0.25	22	29.8	49.6	—	MPC · JPL
2003 HK₅₇	26 April 2003	Mauna Kea Obs. (568)	86	cubewano?	43.4	0.07	6	40.2	46.7	—	MPC · JPL
2003 HL₅₇	26 April 2003	Mauna Kea Obs. (568)	189	cubewano?	79.3	0.65	6	27.8	131	—	MPC · JPL
2003 HN₅₇	26 April 2003	Mauna Kea Obs. (568)	109	cubewano?	44.4	0.07	2	41.5	47.4	—	MPC · JPL
2003 HO₅₇	26 April 2003	Mauna Kea Obs. (568)	83	cubewano (cold)	46.2	0.15	4	39.1	53.3	—	MPC · JPL
2003 HP₅₇	26 April 2003	Mauna Kea Obs. (568)	218	other TNO	46.7	0.19	38	37.9	55.4	—	MPC · JPL
2003 HX₅₆	26 April 2003	Mauna Kea Obs. (568)	158	other TNO	47.0	0.22	30	36.6	57.5	BR-mag: 1.01	MPC · JPL
2003 HZ₅₆	26 April 2003	Mauna Kea Obs. (568)	105	cubewano (cold)	43.5	0.00	3	43.5	43.5	—	MPC · JPL
2003 KO₂₀	30 May 2003	M. W. Buie (807)	159	cubewano (cold)	43.9	0.04	2	41.9	45.9	—	MPC · JPL
2003 KP₂₀	30 May 2003	Cerro Tololo Obs. (807)	125	cubewano?	44.8	0.12	2	39.5	50.2	—	MPC · JPL
2003 LA7	1 June 2003	M. W. Buie (807)	181	res · 1:4	77.1	0.53	6	35.9	118	—	MPC · JPL
2003 LC₇	1 June 2003	Cerro Tololo Obs. (807)	197	cubewano?	45.1	0.12	5	39.9	50.4	—	MPC · JPL
2003 LD₇	1 June 2003	Cerro Tololo Obs. (807)	143	cubewano?	42.9	0.04	2	41.1	44.7	—	MPC · JPL
2003 LD₉	1 June 2003	M. W. Buie K. J. Meech (807)	182	other TNO	47.4	0.17	7	39.3	55.5	—	MPC · JPL
2003 LE₇	1 June 2003	Cerro Tololo Obs. (807)	143	plutino?	39.3	0.21	19	31.2	47.4	—	MPC · JPL
2003 LF₇	1 June 2003	Cerro Tololo Obs. (807)	124	plutino?	39.5	0.13	3	34.5	44.5	—	MPC · JPL
2003 LZ₆	1 June 2003	Cerro Tololo Obs. (807)	172	cubewano?	43.5	0.00	7	43.5	43.5	—	MPC · JPL
2003 MM₁₃	25 June 2003	Mauna Kea Obs. (568)	297	centaur	36.2	0.44	2	20.1	52.2	—	MPC · JPL
2003 OS₃₃	31 July 2003	Mauna Kea Obs. (568)	119	SDO	70.0	0.52	21	33.3	107	—	MPC · JPL
2003 QB₁₁₂	26 August 2003	M. W. Buie (807)	186	cubewano (hot)	44.4	0.11	11	39.3	49.4	—	MPC · JPL
2003 QC₉₁	25 August 2003	Cerro Tololo Obs. (807)	137	cubewano?	43.5	0.00	3	43.5	43.5	—	MPC · JPL
2003 QD₉₁	23 August 2003	M. W. Buie (807)	115	cubewano (cold)	43.6	0.04	2	41.9	45.3	—	MPC · JPL
2003 QE₉₁	23 August 2003	M. W. Buie (807)	114	cubewano (cold)	43.3	0.05	4	41.0	45.6	—	MPC · JPL
2003 QE₁₁₂	26 August 2003	M. W. Buie (807)	170	cubewano (cold)	43.4	0.04	4	41.8	45.0	—	MPC · JPL
2003 QF₉₁	23 August 2003	M. W. Buie (807)	111	cubewano (cold)	43.3	0.04	2	41.6	45.0	—	MPC · JPL
2003 QG₉₁	24 August 2003	M. W. Buie (807)	112	cubewano (cold)	42.9	0.02	2	41.8	43.9	—	MPC · JPL
2003 QJ₉₁	24 August 2003	M. W. Buie (807)	144	cubewano (cold)	44.6	0.04	3	42.8	46.5	—	MPC · JPL
2003 QL₉₁	25 August 2003	M. W. Buie (807)	132	cubewano (cold)	43.4	0.02	2	42.6	44.1	—	MPC · JPL
2003 QM₉₁	25 August 2003	M. W. Buie (807)	167	cubewano (cold)	43.5	0.05	3	41.2	45.7	—	MPC · JPL
2003 QM₁₁₂	29 August 2003	Mauna Kea Obs. (568)	8	centaur	83.4	0.84	16	13.2	154	—	MPC · JPL
2003 QN₉₁	23 August 2003	M. W. Buie (807)	115	cubewano (cold)	42.9	0.12	4	38.0	47.9	—	MPC · JPL
2003 QO₁₁₂	29 August 2003	Mauna Kea Obs. (568)	23	centaur	33.3	0.50	7	16.5	50.1	—	MPC · JPL
2003 QP₉₁	23 August 2003	M. W. Buie (807)	120	res · 3:4	36.7	0.10	7	33.1	40.3	—	MPC · JPL
2003 QS₉₁	25 August 2003	M. W. Buie (807)	96	cubewano (cold)	46.6	0.15	4	39.6	53.6	—	MPC · JPL
2003 QT₉₀	23 August 2003	M. W. Buie (807)	145	cubewano (cold)	44.2	0.05	2	41.8	46.6	—	MPC · JPL
2003 QU₉₀	23 August 2003	Cerro Tololo Obs. (807)	121	cubewano (cold)	43.4	0.01	2	43.0	43.7	—	MPC · JPL
2003 QU₉₁	25 August 2003	Cerro Tololo Obs. (807)	138	other TNO	43.6	0.14	26	37.6	49.7	—	MPC · JPL
2003 QV₉₁	23 August 2003	Cerro Tololo Obs. (807)	150	plutino?	39.5	0.35	33	25.7	53.3	—	MPC · JPL
2003 QW₉₁	23 August 2003	Cerro Tololo Obs. (807)	72	plutino?	39.5	0.27	5	28.7	50.2	—	MPC · JPL
2003 QX₉₀	24 August 2003	M. W. Buie (807)	145	cubewano (cold)	44.1	0.01	3	43.5	44.8	—	MPC · JPL
2003 QX₉₁	23 August 2003	M. W. Buie (807)	74	res · 4:7	44.0	0.26	28	32.8	55.3	—	MPC · JPL
2003 QY₉₀	24 August 2003	M. W. Buie (807)	81	cubewano (cold)	43.1	0.04	4	41.2	45.0	albedo: 0.310; binary: 80 km	MPC · JPL
2003 QY₉₁	23 August 2003	Cerro Tololo Obs. (807)	109	SDO	82.5	0.61	26	32.0	133	—	MPC · JPL
2003 QY₁₁₃	31 August 2003	Mauna Kea Obs. (568)	157	cubewano?	45.3	0.03	3	43.9	46.8	—	MPC · JPL
2003 QZ₉₀	24 August 2003	Cerro Tololo Obs. (807)	157	cubewano?	43.6	0.00	6	43.6	43.6	—	MPC · JPL
2003 QZ₁₁₃										Not in Johnston's Archive	MPC · JPL
2003 SO₃₁₇	25 September 2003	Mauna Kea Obs. (568)	112	plutino	39.6	0.28	7	28.6	50.6	—	MPC · JPL
2003 SS422	28 September 2003	Cerro Tololo Obs. (807)	137	SDO	199	0.80	17	39.6	359	ETNO	MPC · JPL
2003 TJ₅₈	3 October 2003	Mauna Kea Obs. (568)	65	cubewano (cold)	44.3	0.09	1	40.5	48.2	albedo: 0.285; binary: 51 km	MPC · JPL
2003 TK₅₈	3 October 2003	Mauna Kea Obs. (568)	145	cubewano (cold)	43.0	0.07	3	40.2	45.9	—	MPC · JPL
2003 TL₅₈	3 October 2003	Mauna Kea Obs. (568)	204	cubewano (hot)	43.4	0.04	8	41.6	45.3	—	MPC · JPL
2003 UA₂₉₂	22 October 2003	Kitt Peak Obs. (695)	207	cubewano?	46.8	0.15	11	39.8	53.8	—	MPC · JPL
2003 UB₂₉₂	23 October 2003	M. W. Buie (695)	277	other TNO	47.2	0.05	19	44.8	49.7	—	MPC · JPL
2003 UC₂₉₂	23 October 2003	Kitt Peak Obs. (695)	143	cubewano?	45.1	0.09	4	41.2	49.1	—	MPC · JPL
2003 UD₂₉₂	23 October 2003	Kitt Peak Obs. (695)	164	cubewano?	46.0	0.11	8	40.9	51.1	—	MPC · JPL
2003 UE₂₉₂	23 October 2003	Kitt Peak Obs. (695)	190	other TNO	43.5	0.14	19	37.6	49.3	—	MPC · JPL
2003 UF₂₉₂	23 October 2003	Kitt Peak Obs. (695)	144	other TNO	44.8	0.13	31	39.1	50.5	—	MPC · JPL
2003 UG₂₉₂	23 October 2003	Kitt Peak Obs. (695)	204	cubewano (hot)	43.4	0.10	7	39.1	47.7	—	MPC · JPL
2003 UH₂₉₂	24 October 2003	Kitt Peak Obs. (695)	99	cubewano?	43.9	0.07	7	41.0	46.9	—	MPC · JPL
2003 UK₂₉₂	24 October 2003	Kitt Peak Obs. (695)	125	cubewano?	43.2	0.11	13	38.5	47.9	—	MPC · JPL
2003 UK₂₉₃	23 October 2003	M. W. Buie (695)	110	cubewano (cold)	42.5	0.07	3	39.4	45.6	—	MPC · JPL
2003 UL₂₉₂	24 October 2003	Kitt Peak Obs. (695)	119	cubewano?	44.9	0.07	4	41.5	48.3	—	MPC · JPL
2003 UM₂₉₂	24 October 2003	Kitt Peak Obs. (695)	166	other TNO	46.1	0.19	18	37.4	54.7	—	MPC · JPL
2003 UN₂₉₂	24 October 2003	M. W. Buie (695)	105	cubewano (cold)	44.9	0.11	1	40.1	49.8	—	MPC · JPL
2003 UO₂₉₂	22 October 2003	Kitt Peak Obs. (695)	157	plutino?	39.4	0.19	5	32.0	46.8	—	MPC · JPL
2003 UQ₂₉₂	23 October 2003	Kitt Peak Obs. (695)	188	plutino?	39.5	0.12	3	34.6	44.4	—	MPC · JPL
2003 US₂₉₁	22 October 2003	Kitt Peak Obs. (695)	158	other TNO	44.9	0.00	24	44.9	44.9	—	MPC · JPL
2003 UT₂₉₁	22 October 2003	M. W. Buie (695)	174	cubewano (cold)	42.9	0.06	2	40.2	45.5	—	MPC · JPL
2003 UU₂₉₁	23 October 2003	Kitt Peak Obs. (695)	180	cubewano (cold)?	48.9	0.11	3	43.5	54.2	—	MPC · JPL
2003 UU₂₉₂	24 October 2003	Kitt Peak Obs. (695)	108	plutino?	39.5	0.13	17	34.3	44.7	—	MPC · JPL
2003 UV₂₉₁	23 October 2003	M. W. Buie (695)	115	cubewano (cold)	43.8	0.04	2	42.2	45.3	—	MPC · JPL
2003 UV₂₉₂	24 October 2003	M. W. Buie (695)	157	plutino	39.4	0.22	11	30.8	47.9	—	MPC · JPL
2003 UW₂₉₁	23 October 2003	Kitt Peak Obs. (695)	189	cubewano?	44.6	0.00	12	44.6	44.6	—	MPC · JPL
2003 UX₂₉₁	23 October 2003	Kitt Peak Obs. (695)	137	cubewano?	46.5	0.00	11	46.5	46.5	—	MPC · JPL
2003 UX₂₉₂	23 October 2003	Kitt Peak Obs. (695)	164	cubewano?	44.1	0.12	11	38.6	49.5	—	MPC · JPL
2003 UY₂₈₃	18 October 2003	LPL/Spacewatch II (291)	5	centaur	33.45	0.8	18.90	3.5	63.4	—	MPC · JPL
2003 UY₂₉₁	24 October 2003	M. W. Buie (695)	120	cubewano (cold)	49.3	0.17	4	41.1	57.4	BR-mag: 1.39; taxonomy: BB	MPC · JPL
2003 UZ₂₉₁	22 October 2003	M. W. Buie (695)	196	cubewano (hot)	45.1	0.13	5	39.3	51.0	—	MPC · JPL
2003 UZ₂₉₂	24 October 2003	Kitt Peak Obs. (695)	120	other TNO	43.1	0.14	22	37.2	49.1	—	MPC · JPL
2003 WA₁₉₁	23 November 2003	M. W. Buie (695)	104	plutino	39.3	0.24	5	30.0	48.5	—	MPC · JPL
2003 WN₁₉₃	17 November 2003	Cerro Tololo Obs. (807)	94	plutino	39.4	0.25	22	29.4	49.4	—	MPC · JPL
2003 WO₁₉₃	29 November 2003	Cerro Tololo Obs. (807)	108	plutino	39.7	0.25	7	29.8	49.5	—	MPC · JPL
2003 WQ₁₈₈	20 November 2003	Kitt Peak Obs. (695)	227	cubewano?	46.3	0.00	6	46.3	46.3	—	MPC · JPL
2003 WS₁₈₄	20 November 2003	Kitt Peak Obs. (695)	114	cubewano?	44.0	0.05	3	41.8	46.2	—	MPC · JPL
2003 WV₁₈₈	20 November 2003	Kitt Peak Obs. (695)	130	cubewano?	45.9	0.00	8	45.9	45.9	—	MPC · JPL
2003 WW₁₈₈	21 November 2003	Kitt Peak Obs. (695)	114	cubewano?	44.3	0.08	5	40.9	47.6	—	MPC · JPL
2003 YJ₁₇₉	16 December 2003	Mauna Kea Obs. (568)	126	cubewano (cold)	43.6	0.08	1	40.2	47.0	—	MPC · JPL
2003 YK₁₇₉	16 December 2003	Mauna Kea Obs. (568)	132	other TNO	41.6	0.14	20	35.7	47.4	—	MPC · JPL
2003 YM₁₇₉	16 December 2003	Mauna Kea Obs. (568)	105	other TNO	40.9	0.06	23	38.4	43.4	—	MPC · JPL
2003 YN₁₇₉	16 December 2003	Mauna Kea Obs. (568)	145	cubewano (cold)	44.2	0.01	3	43.8	44.5	—	MPC · JPL
2003 YP₁₇₉	24 December 2003	Mauna Kea Obs. (568)	113	cubewano (cold)	43.8	0.08	1	40.3	47.3	—	MPC · JPL
2003 YR₁₇₉	24 December 2003	Mauna Kea Obs. (568)	195	cubewano (hot)	43.2	0.05	10	41.1	45.2	—	MPC · JPL
2003 YS₁₇₉	24 December 2003	Mauna Kea Obs. (568)	109	cubewano (cold)	43.3	0.02	4	42.4	44.3	binary: 95 km	MPC · JPL
2003 YT₁₇₉	24 December 2003	Mauna Kea Obs. (568)	126	cubewano (cold)	43.3	0.03	2	42.1	44.6	—	MPC · JPL
2003 YV₁₇₉	24 December 2003	Mauna Kea Obs. (568)	166	other TNO	46.7	0.21	16	36.7	56.6	—	MPC · JPL
2003 YX₁₇₉	24 December 2003	Mauna Kea Obs. (568)	132	cubewano (cold)	43.3	0.04	5	41.7	45.0	—	MPC · JPL
2003 YY₁₇₉	16 December 2003	Mauna Kea Obs. (568)	72	plutino?	39.6	0.16	11	33.4	45.7	—	MPC · JPL
2003 YZ₁₇₉	24 December 2003	Mauna Kea Obs. (568)	104	cubewano?	43.2	0.12	13	38.2	48.1	—	MPC · JPL

v t e Trans-Neptunian objects
TNO classes	Classical Kuiper belt objects Scattered-disc objects Detached objects Resonant objects Neptune trojans plutinos twotinos TNO moons
Dwarf planets (moons)	Orcus Vanth Pluto Charon Styx Nix Kerberos Hydra Haumea Namaka Hiʻiaka ring Quaoar Weywot rings Makemake MK 2 Gonggong Xiangliu Eris Dysnomia Sedna
Sednoids	Sedna 2012 VP113 'Biden' Leleākūhonua 2023 KQ14 'Ammonite'

List of unnumbered trans-Neptunian objects: 2003

References

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