2021 WC4

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS

Orbital Elements

Epoch (TDB)	2025-11-21 (JD 2461000.5)
Eccentricity (e)	0.6064558549 ± 4.28e-04
Semi-major axis (a)	2.0505333743 AU ± 2.00e-03
Inclination (i)	3.48227907° ± 2.20e-03
Long. of Asc. Node (Ω)	244.08168039° ± 5.21e-04
Arg. of Perihelion (ω)	244.36737377° ± 3.91e-03
Mean Anomaly (M)	113.83013974° ± 6.96e-01
Mean Motion (n)	0.3356696014°/day ± 4.91e-04
Perihelion dist (q)	0.80697540 AU ± 1.18e-03
Aphelion dist (Q)	3.29409134 AU ± 3.33e-03
Orbital Period	2.93629891 yr ± 4.30e-03

Physical Parameters

H (abs. magnitude)	28.25
G (slope)	0.15

Orbit Solution

Source	IAA
Solution Date	2026-06-02
RMS Residual	0.253″
Uncertainty	3
Orbit Type	Apollo
MOID	0.005667 AU
Observations Used	18
Oppositions	1
Arc Total	2021-2021
First Observation Used	2021-11-29
Last Observation Used	2021-11-30

Observations (18)

Date	Type	RA	Dec	Mag	Band	Observatory
2021-11-29 07:58:18	C	04 46 10.31	+12 42 58.5	–	V	G96
2021-11-29 08:13:04	C	04 46 31.33	+12 39 04.6	–	V	G96
2021-11-29 08:20:27	C	04 46 42.03	+12 37 04.6	–	V	G96
2021-11-29 10:39:54	C	04 50 12.40	+11 57 49.3	–	V	I52
2021-11-29 10:40:25	C	04 50 13.21	+11 57 39.6	–	V	I52
2021-11-29 10:40:56	C	04 50 14.07	+11 57 30.6	–	V	I52
2021-11-29 10:41:28	C	04 50 14.87	+11 57 21.4	–	V	I52
2021-11-29 23:54:08	C	05 18 25.98	+06 56 27.2	–	V	L01
2021-11-29 23:56:37	C	05 18 32.31	+06 55 14.3	–	V	L01
2021-11-29 23:59:05	C	05 18 38.52	+06 54 02.0	–	V	L01
2021-11-30 00:00:41	C	05 18 42.58	+06 53 14.9	–	V	L01
2021-11-30 00:02:34	C	05 18 47.30	+06 52 20.2	–	V	L01
2021-11-30 00:49:33	C	05 20 49.83	+06 28 10.5	–	V	033
2021-11-30 00:50:02	C	05 20 51.14	+06 27 55.8	–	V	033
2021-11-30 00:50:31	C	05 20 52.44	+06 27 40.7	–	V	033
2021-11-30 00:51:05	C	05 20 53.86	+06 27 23.7	–	V	033
2021-11-30 01:35:44	C	05 22 53.24	+06 05 07.4	–	V	204
2021-11-30 01:50:20	C	05 23 32.80	+05 57 26.9	–	V	204