2016 GW221 — IAA Minor Planet Database

Orbital Elements

Epoch (TDB)	2025-11-21 (JD 2461000.5)
Eccentricity (e)	0.2668194102 ± 8.07e-08
Semi-major axis (a)	0.8280652813 AU ± 1.49e-07
Inclination (i)	3.76066121° ± 4.30e-06
Long. of Asc. Node (Ω)	33.05117224° ± 2.85e-05
Arg. of Perihelion (ω)	8.86674230° ± 3.10e-05
Mean Anomaly (M)	70.46270578° ± 2.66e-05
Mean Motion (n)	1.3080230945°/day ± 3.52e-07
Perihelion dist (q)	0.60712139 AU ± 1.28e-07
Aphelion dist (Q)	1.04900917 AU ± 2.00e-07
Orbital Period	0.75352361 yr ± 2.03e-07
NGA Model	r2
A1	1.50180952e-10 ± 3.82e-11 AU/d²
A2	-1.96665859e-13 ± 9.44e-15 AU/d²
A3	3.76285166e-11 ± 4.01e-12 AU/d²

Physical Parameters

H (abs. magnitude)	24.75
G (slope)	0.15

Orbit Solution

Source	IAA
Solution Date	2026-06-02
RMS Residual	0.380″
Uncertainty	0
Orbit Type	Aten
MOID	0.022198 AU
Observations Used	230
Radar Obs Used	1
Oppositions	1
Arc Total	2016-2025
First Observation Used	2016-04-14
Last Observation Used	2025-04-27

Observations (234)

Date	Type	RA	Dec	Mag	Band	Observatory
2019-04-05 13:23:54	C	17 18 03.631	+15 54 17.07	–	V	F51
2019-04-05 13:40:09	C	17 17 48.848	+15 54 44.03	–	V	F51
2019-04-05 13:56:46	C	17 17 33.714	+15 55 11.41	–	V	F51
2019-04-05 14:12:47	C	17 17 19.071	+15 55 37.00	–	V	F51
2019-04-06 13:50:50	C	16 56 34.53	+16 29 56.4	–	V	T05
2019-04-06 13:57:04	C	16 56 28.26	+16 30 05.9	–	V	T05
2019-04-06 13:59:05	C	16 56 26.23	+16 30 08.6	–	V	T05
2019-04-06 14:15:48	C	16 56 09.42	+16 30 31.1	–	V	T05
2019-04-06 14:16:27	C	16 56 08.73	+16 30 32.2	–	V	T05
2019-04-06 14:31:13	C	16 55 53.82	+16 30 52.1	–	V	T05
2019-04-06 14:33:02	C	16 55 51.99	+16 30 54.1	–	V	T05
2019-04-06 14:46:29	C	16 55 38.35	+16 31 12.9	–	V	T05
2019-04-06 18:21:33	C	16 52 23.01	+16 34 41.3	–	r	P93
2019-04-06 18:24:52	C	16 52 19.64	+16 34 45.7	–	r	P93
2019-04-06 18:28:12	C	16 52 16.26	+16 34 50.2	–	r	P93
2019-04-06 18:41:31	C	16 52 02.77	+16 35 08.5	–	r	P93
2019-04-08 12:52:43	C	16 09 28.47	+17 17 00.5	–	V	T08
2019-04-08 13:14:37	C	16 09 02.85	+17 17 13.5	–	V	T08
2019-04-08 13:15:17	C	16 09 02.15	+17 17 14.1	–	V	T08
2019-04-08 13:22:58	C	16 08 53.09	+17 17 18.2	–	V	T08
2019-04-10 08:26:01	C	15 21 00.76	+17 18 07.6	–	V	I41
2019-04-10 08:26:31	C	15 21 00.19	+17 18 06.8	–	V	I41
2019-04-10 08:58:42	C	15 20 20.94	+17 17 55.2	–	V	I41
2019-04-10 08:59:12	C	15 20 20.30	+17 17 54.3	–	V	I41
2019-04-10 12:03:43	C	15 16 47.77	+17 17 26.5	–	V	T05
2019-04-10 12:11:52	C	15 16 37.72	+17 17 22.6	–	V	T05
2019-04-10 12:29:14	C	15 16 16.16	+17 17 12.2	–	V	T05
2019-04-10 12:29:54	C	15 16 15.42	+17 17 12.3	–	V	T05
2019-04-11 21:50:44	C	14 38 44.68	+16 40 12.6	–	V	Z80
2019-04-11 21:57:20	C	14 38 37.13	+16 40 03.6	–	V	Z80
2019-04-11 22:03:59	C	14 38 29.54	+16 39 56.1	–	V	Z80
2019-04-13 06:35:40	C	14 03 31.62	+15 45 11.2	–	V	G96
2019-04-13 06:43:30	C	14 03 23.02	+15 44 56.4	–	V	G96
2019-04-13 06:51:21	C	14 03 14.33	+15 44 41.2	–	V	G96
2019-04-13 07:01:51	C	14 03 02.74	+15 44 21.0	–	V	G96
2019-04-13 07:27:31	C	14 02 34.27	+15 43 30.6	–	V	703
2019-04-13 07:35:11	C	14 02 25.78	+15 43 15.2	–	V	703
2019-04-13 07:42:52	C	14 02 17.26	+15 43 00.0	–	V	703
2019-04-13 07:50:32	C	14 02 08.81	+15 42 44.5	–	V	703
2019-04-13 23:01:15	C	13 47 02.62	+15 08 46.5	–	V	J69
2019-04-13 23:09:14	C	13 46 54.41	+15 08 29.8	–	V	J69
2019-04-13 23:17:13	C	13 46 46.14	+15 08 13.3	–	V	J69
2019-04-15 19:16:45	C	13 07 40.72	+13 23 39.2	–	V	246
2019-04-15 19:16:56	C	13 07 40.56	+13 23 38.2	–	V	246
2019-04-15 19:17:05	C	13 07 40.45	+13 23 39.2	–	V	246
2019-04-16 01:31:21	C	13 02 24.86	+13 08 20.6	–	V	K74
2019-04-16 01:33:36	C	13 02 23.03	+13 08 14.5	–	V	K74
2019-04-16 01:36:27	C	13 02 20.70	+13 08 06.9	–	V	K74
2019-04-19 19:38:11	C	12 05 59.04	+09 40 27.9	–	V	246
2019-04-19 19:40:40	C	12 05 57.84	+09 40 23.1	–	V	246

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