List of unnumbered minor planets: 2004 Y

This is a partial list of unnumbered minor planets for principal provisional designations assigned during 16–31 December 2004. As of February 2022^[update], a total of 156 bodies remain unnumbered for this period.^[1]^[2]^[3] Objects for this year are listed on the following pages: A–B · C · D–E · F · G–H · J–O · P–Q · R_i · R_ii · R_iii · S · T_i · T_ii · T_iii · T_iv · U–V · W–X and Y. Also see previous and next year.

Near-Earth obj.	MBA (inner)	MBA (outer)	Centaur
Mars-crosser	MBA (middle)	Jupiter trojan	Trans-Neptunian obj.
Unclassified

Y

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

8	2004 YA	APO	24.9	37 m	single	2 days	18 Dec 2004	19	Disc.: LINEAR	MPC · JPL
8	2004 YC	ATE	25.6	27 m	single	5 days	19 Dec 2004	35	Disc.: LINEAR	MPC · JPL
8	2004 YD	ATE	24.0	56 m	single	9 days	26 Dec 2004	22	Disc.: LONEOS	MPC · JPL
6	2004 YE	AMO	24.9	37 m	single	19 days	03 Jan 2005	21	Disc.: LINEAR	MPC · JPL
1	2004 YL	HUN	18.3	650 m	multiple	2004–2019	05 Jul 2019	43	Disc.: LINEAR Alt.: 2014 NP49	MPC · JPL
8	2004 YQ	APO	24.4	47 m	single	2 days	20 Dec 2004	18	Disc.: LINEAR	MPC · JPL
1	2004 YR	APO	20.3	310 m	multiple	2004–2014	01 Jul 2014	134	Disc.: LINEAR	MPC · JPL
2	2004 YG1	APO	21.4	190 m	multiple	2004–2013	02 Aug 2013	94	Disc.: LINEAR	MPC · JPL
0	2004 YH1	MCA	17.55	920 m	multiple	2004–2022	06 Jan 2022	58	Disc.: LINEAR	MPC · JPL
5	2004 YJ1	AMO	20.7	260 m	single	15 days	02 Jan 2005	51	Disc.: LINEAR	MPC · JPL
1	2004 YK1	AMO	21.3	200 m	multiple	2004–2018	20 Mar 2018	47	Disc.: LINEAR	MPC · JPL
0	2004 YX1	MCA	17.90	1.1 km	multiple	2004–2021	28 Nov 2021	116	Disc.: MLS	MPC · JPL
0	2004 YX4	MBA-M	16.94	2.3 km	multiple	2004–2021	09 Sep 2021	64	Disc.: KLENOT Alt.: 2010 KR65	MPC · JPL
9	2004 YA5	ATE	22.6	110 m	single	13 days	31 Dec 2004	30	Disc.: LINEAR	MPC · JPL
–	2004 YB5	MCA	18.0	1.4 km	single	2 days	21 Dec 2004	28	Disc.: LINEAR	MPC · JPL
6	2004 YD5	APO	29.3	5 m	single	1 day	21 Dec 2004	21	Disc.: Spacewatch	MPC · JPL
0	2004 YW5	MCA	19.12	450 m	multiple	2004–2022	08 Jan 2022	79	Disc.: Spacewatch	MPC · JPL
0	2004 YE8	MBA-O	16.4	2.9 km	multiple	2004–2020	20 Dec 2020	83	Disc.: MLS	MPC · JPL
0	2004 YN11	MBA-O	17.4	1.8 km	multiple	2004–2019	24 Sep 2019	35	Disc.: MLS	MPC · JPL
0	2004 YU12	MBA-O	17.5	1.8 km	multiple	2004–2020	14 Nov 2020	62	Disc.: MLS	MPC · JPL
0	2004 YD13	MBA-I	18.4	620 m	multiple	2004–2018	10 Dec 2018	25	Disc.: MLS	MPC · JPL
0	2004 YZ13	MBA-O	17.42	1.8 km	multiple	2004–2022	12 Jan 2022	59	Disc.: MLS Added on 21 August 2021 Alt.: 2010 BH46, 2015 XP371	MPC · JPL
5	2004 YF15	JT	13.8	9.7 km	multiple	2004–2017	31 Jan 2017	24	Disc.: MLS Trojan camp (L5) Alt.: 2017 BN37	MPC · JPL
0	2004 YK15	JT	14.2	8.0 km	multiple	2004–2020	21 Jun 2020	54	Disc.: MLS Added on 17 January 2021 Trojan camp (L5)	MPC · JPL
0	2004 YS15	MBA-O	16.87	2.4 km	multiple	2004–2021	17 Apr 2021	71	Disc.: MLS	MPC · JPL
0	2004 YU15	MBA-O	17.5	1.8 km	multiple	2002–2021	13 Feb 2021	35	Disc.: MLS Added on 11 May 2021	MPC · JPL
0	2004 YC17	MBA-M	17.01	1.7 km	multiple	2004–2022	27 Jan 2022	183	Disc.: MLS Alt.: 2010 LG101	MPC · JPL
0	2004 YD17	MBA-M	17.2	1.5 km	multiple	2004–2020	12 Sep 2020	86	Disc.: MLS	MPC · JPL
0	2004 YX17	MBA-M	17.50	940 m	multiple	1999–2022	26 Jan 2022	98	Disc.: MLS Alt.: 2012 XC157	MPC · JPL
0	2004 YX18	MBA-M	17.59	1.7 km	multiple	2004–2021	11 Sep 2021	61	Disc.: MLS Alt.: 2013 YE106	MPC · JPL
4	2004 YY23	AMO	19.4	470 m	single	44 days	04 Feb 2005	157	Disc.: CSS	MPC · JPL
2	2004 YN24	MBA-M	17.8	820 m	multiple	2000–2021	09 Jan 2021	77	Disc.: Spacewatch Added on 17 January 2021 Alt.: 2009 AG34	MPC · JPL
0	2004 YY24	MBA-M	17.41	1.4 km	multiple	2004–2022	04 Jan 2022	94	Disc.: MLS	MPC · JPL
0	2004 YJ25	MBA-I	18.28	660 m	multiple	2004–2021	07 Oct 2021	47	Disc.: MLS	MPC · JPL
0	2004 YT25	MBA-M	17.8	1.2 km	multiple	2004–2020	16 Oct 2020	67	Disc.: MLS Alt.: 2012 VS45	MPC · JPL
0	2004 YD26	MBA-M	17.1	1.1 km	multiple	2004–2021	11 Jan 2021	126	Disc.: MLS Alt.: 2010 MR50	MPC · JPL
0	2004 YX26	MBA-O	16.72	2.5 km	multiple	2004–2022	27 Jan 2022	61	Disc.: MLS Alt.: 2010 DO90	MPC · JPL
0	2004 YB28	MBA-I	18.2	680 m	multiple	2004–2021	02 Jan 2021	150	Disc.: LINEAR Alt.: 2007 TW377	MPC · JPL
0	2004 YF28	HUN	19.03	460 m	multiple	2004–2022	06 Jan 2022	23	Disc.: Spacewatch Added on 24 December 2021	MPC · JPL
0	2004 YB29	MBA-O	16.6	2.7 km	multiple	2004–2020	14 Dec 2020	87	Disc.: Spacewatch Alt.: 2014 WM32, 2016 AL142	MPC · JPL
0	2004 YX29	MBA-M	17.2	1.1 km	multiple	2004–2021	14 Jan 2021	69	Disc.: Spacewatch	MPC · JPL
0	2004 YE32	MCA	17.58	1.3 km	multiple	2001–2022	13 Jan 2022	108	Disc.: LONEOS	MPC · JPL
0	2004 YS34	MBA-O	16.7	3.5 km	multiple	2004–2020	16 Oct 2020	80	Disc.: MLS Alt.: 2010 AP123	MPC · JPL
1	2004 YY34	MBA-O	17.14	2.1 km	multiple	2004–2021	26 Nov 2021	59	Disc.: MLS Added on 5 November 2021	MPC · JPL
0	2004 YS36	MBA-O	17.2	2.0 km	multiple	2004–2021	07 Jan 2021	68	Disc.: MLS Alt.: 2004 YC15, 2016 CS152	MPC · JPL
1	2004 YR37	MBA-M	17.9	1.1 km	multiple	2004–2020	10 Nov 2020	79	Disc.: MLS	MPC · JPL
0	2004 YT37	MBA-M	16.95	1.2 km	multiple	2004–2022	27 Jan 2022	147	Disc.: MLS	MPC · JPL
0	2004 YW37	MBA-I	18.22	670 m	multiple	2004–2021	02 Dec 2021	121	Disc.: Spacewatch	MPC · JPL
0	2004 YX37	MBA-I	17.0	1.2 km	multiple	2004–2020	18 Jul 2020	152	Disc.: Spacewatch	MPC · JPL
0	2004 YY37	MBA-I	18.23	670 m	multiple	2004–2022	26 Jan 2022	92	Disc.: Spacewatch	MPC · JPL
0	2004 YD38	MBA-M	17.35	1.4 km	multiple	2004–2021	28 Dec 2021	81	Disc.: Spacewatch	MPC · JPL
0	2004 YK38	MBA-I	18.7	540 m	multiple	2004–2020	16 Mar 2020	64	Disc.: MLS	MPC · JPL
0	2004 YM38	MBA-I	18.82	510 m	multiple	2004–2022	27 Jan 2022	56	Disc.: Spacewatch	MPC · JPL
2	2004 YN38	MBA-I	18.6	570 m	multiple	2004–2018	06 Oct 2018	57	Disc.: MLS	MPC · JPL
1	2004 YO38	MBA-M	16.9	1.2 km	multiple	2002–2021	16 Jan 2021	123	Disc.: Spacewatch Alt.: 2013 AJ195	MPC · JPL
0	2004 YQ38	MBA-M	17.5	940 m	multiple	2004–2020	20 Oct 2020	69	Disc.: Spacewatch	MPC · JPL
0	2004 YS38	MBA-M	17.92	1.1 km	multiple	2004–2022	22 Jan 2022	73	Disc.: Spacewatch	MPC · JPL
0	2004 YU38	MBA-M	17.40	1.4 km	multiple	2004–2022	04 Jan 2022	127	Disc.: Spacewatch	MPC · JPL
0	2004 YV38	MBA-M	17.17	2.0 km	multiple	2004–2021	04 Oct 2021	64	Disc.: Spacewatch	MPC · JPL
0	2004 YW38	MBA-O	15.9	3.7 km	multiple	2004–2020	16 Nov 2020	70	Disc.: Spacewatch	MPC · JPL
0	2004 YY38	MBA-M	17.74	1.2 km	multiple	2004–2021	04 Dec 2021	50	Disc.: Spacewatch	MPC · JPL
0	2004 YA39	MBA-O	16.5	2.8 km	multiple	2004–2021	09 Jan 2021	60	Disc.: MLS Alt.: 2016 BC3	MPC · JPL
0	2004 YB39	MBA-M	17.7	860 m	multiple	1991–2021	06 Jan 2021	135	Disc.: Spacewatch Alt.: 1995 SB44	MPC · JPL
0	2004 YD39	MBA-O	16.6	2.7 km	multiple	2004–2021	17 Jan 2021	73	Disc.: Spacewatch Alt.: 2010 BT124	MPC · JPL
0	2004 YE39	MBA-O	16.43	2.9 km	multiple	2004–2022	27 Jan 2022	114	Disc.: MLS Alt.: 2010 CU193	MPC · JPL
0	2004 YF39	MBA-I	18.4	620 m	multiple	2004–2020	26 Apr 2020	47	Disc.: Spacewatch	MPC · JPL
0	2004 YG39	MBA-I	19.02	470 m	multiple	2004–2021	31 Aug 2021	33	Disc.: Spacewatch	MPC · JPL
3	2004 YJ39	MBA-M	18.0	1.1 km	multiple	2004–2018	18 Feb 2018	28	Disc.: MLS	MPC · JPL
0	2004 YK39	MBA-M	17.7	1.2 km	multiple	2004–2020	25 Jul 2020	36	Disc.: MLS	MPC · JPL
1	2004 YL39	MBA-M	17.6	900 m	multiple	2004–2021	14 Jan 2021	179	Disc.: CSS	MPC · JPL
0	2004 YM39	MBA-O	16.93	2.3 km	multiple	2002–2022	06 Jan 2022	73	Disc.: MLS Alt.: 2010 CW214	MPC · JPL
0	2004 YQ39	MBA-O	16.7	2.5 km	multiple	2004–2021	17 Jan 2021	79	Disc.: Spacewatch	MPC · JPL
0	2004 YT39	MBA-I	19.0	470 m	multiple	2004–2019	03 Dec 2019	58	Disc.: MLS	MPC · JPL
1	2004 YU39	MBA-I	18.7	540 m	multiple	2004–2018	15 Oct 2018	52	Disc.: Spacewatch	MPC · JPL
0	2004 YW39	MBA-M	17.5	940 m	multiple	2004–2020	15 Dec 2020	69	Disc.: MLS	MPC · JPL
0	2004 YA40	MBA-M	18.09	1.0 km	multiple	2004–2021	28 Sep 2021	56	Disc.: MLS	MPC · JPL
0	2004 YB40	MBA-M	17.84	1.1 km	multiple	2004–2021	09 Dec 2021	90	Disc.: Spacewatch	MPC · JPL
0	2004 YD40	MBA-I	19.16	440 m	multiple	2004–2021	13 Jul 2021	48	Disc.: MLS	MPC · JPL
0	2004 YF40	MBA-O	16.8	2.4 km	multiple	2004–2021	18 Jan 2021	39	Disc.: MLS	MPC · JPL
1	2004 YG40	HUN	19.1	450 m	multiple	2004–2020	23 Jan 2020	55	Disc.: MLS	MPC · JPL
1	2004 YH40	MBA-I	18.1	710 m	multiple	2004–2020	24 Mar 2020	38	Disc.: MLS	MPC · JPL
0	2004 YJ40	MBA-M	17.51	1.3 km	multiple	2004–2021	11 Nov 2021	40	Disc.: Spacewatch	MPC · JPL
0	2004 YL40	MBA-O	16.41	2.9 km	multiple	2004–2022	25 Jan 2022	134	Disc.: Spacewatch Alt.: 2010 BW130	MPC · JPL
0	2004 YN40	MBA-O	16.18	3.2 km	multiple	2004–2021	10 Sep 2021	73	Disc.: MLS	MPC · JPL
0	2004 YU40	MBA-I	18.7	540 m	multiple	2004–2020	12 Sep 2020	33	Disc.: MLS	MPC · JPL
0	2004 YX40	MBA-M	18.02	1.0 km	multiple	2004–2021	27 Nov 2021	57	Disc.: Spacewatch	MPC · JPL
0	2004 YA41	MBA-I	18.75	530 m	multiple	2004–2022	05 Jan 2022	34	Disc.: MLS	MPC · JPL
0	2004 YB41	MBA-I	18.7	540 m	multiple	2004–2018	06 Oct 2018	33	Disc.: Spacewatch	MPC · JPL
0	2004 YD41	MBA-O	16.8	2.4 km	multiple	2004–2020	18 Nov 2020	56	Disc.: Spacewatch	MPC · JPL
1	2004 YE41	HUN	18.9	490 m	multiple	2004–2021	07 Jun 2021	51	Disc.: MLS	MPC · JPL
0	2004 YF41	MBA-I	18.7	540 m	multiple	2004–2020	23 Jan 2020	46	Disc.: Spacewatch	MPC · JPL
0	2004 YH41	MBA-I	18.6	570 m	multiple	2004–2020	30 Jan 2020	51	Disc.: Spacewatch Added on 22 July 2020	MPC · JPL
0	2004 YJ41	MBA-I	18.2	680 m	multiple	2004–2019	29 Apr 2019	46	Disc.: MLS Added on 22 July 2020	MPC · JPL
0	2004 YL41	MBA-M	17.40	1.4 km	multiple	2004–2021	20 Nov 2021	71	Disc.: MLS Added on 22 July 2020	MPC · JPL
1	2004 YN41	MBA-I	18.8	520 m	multiple	2004–2020	22 Mar 2020	35	Disc.: MLS Added on 22 July 2020	MPC · JPL
1	2004 YO41	MBA-I	18.6	570 m	multiple	2004–2020	21 Mar 2020	33	Disc.: MLS Added on 22 July 2020	MPC · JPL
2	2004 YP41	MBA-M	17.4	980 m	multiple	2004–2020	21 Dec 2020	76	Disc.: MLS Added on 19 October 2020	MPC · JPL
0	2004 YR41	MBA-M	17.34	1.0 km	multiple	2001–2022	12 Jan 2022	88	Disc.: CSS Added on 17 January 2021 Alt.: 2020 MK7	MPC · JPL
0	2004 YS41	MBA-M	17.3	1.5 km	multiple	2004–2020	10 Sep 2020	43	Disc.: MLS Added on 17 January 2021	MPC · JPL
2	2004 YU41	MBA-M	17.9	780 m	multiple	2004–2020	11 Oct 2020	52	Disc.: MLS Added on 17 January 2021	MPC · JPL
0	2004 YW41	MBA-M	17.6	900 m	multiple	2004–2020	14 Dec 2020	68	Disc.: MLS Added on 17 January 2021	MPC · JPL
0	2004 YY41	MBA-O	17.29	1.9 km	multiple	2004–2022	06 Jan 2022	23	Disc.: Spacewatch Added on 11 May 2021	MPC · JPL
0	2004 YA42	MBA-M	18.06	1.0 km	multiple	2004–2021	09 Dec 2021	71	Disc.: MLS Added on 21 August 2021	MPC · JPL
0	2004 YB42	MBA-O	17.64	1.7 km	multiple	2004–2021	18 Jan 2021	38	Disc.: MLS Added on 5 November 2021	MPC · JPL

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References

^ "Data Available from the Minor Planet Center – MPCORB.DAT". Minor Planet Center. 29 January 2022. (doc)
^ "NEOWISE Diameters and Albedos – V2.0". PDS Small Bodies Node. 2019. Retrieved 1 February 2022.
^ "List Of Jupiter Trojans". Minor Planet Center. 26 January 2021. Retrieved 1 February 2022.

[MPCORB-1] "Data Available from the Minor Planet Center – MPCORB.DAT". Minor Planet Center. 29 January 2022. (doc)

[PDS-NEOWISE-diameters-2] "NEOWISE Diameters and Albedos – V2.0". PDS Small Bodies Node. 2019. Retrieved 1 February 2022.

[MPC-JupiterTrojans-3] "List Of Jupiter Trojans". Minor Planet Center. 26 January 2021. Retrieved 1 February 2022.

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