2021 SP4

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4051256888 ± 1.65e-08
Semi-major axis (a)1.4674746982 AU ± 4.34e-09
Inclination (i)9.91525585° ± 3.71e-06
Long. of Asc. Node (Ω)161.31670660° ± 2.55e-05
Arg. of Perihelion (ω)324.97450802° ± 2.47e-05
Mean Anomaly (M)53.56481644° ± 5.42e-06
Mean Motion (n)0.5544422830°/day ± 2.46e-09
Perihelion dist (q)0.87296300 AU ± 2.44e-08
Aphelion dist (Q)2.06198640 AU ± 2.50e-08
Orbital Period1.77768961 yr ± 7.89e-09
Physical Parameters
H (abs. magnitude)20.96
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.269″
Uncertainty0
Orbit TypeApollo
MOID0.047950 AU
Observations Used165
Oppositions7
Arc Total2005-2022
First Observation Used2005-09-28
Last Observation Used2022-06-04
Observations (167)
Date Type RA Dec Mag Band Observatory
2021-10-25 05:01:14 C 01 42 07.26 -19 55 25.2 u 807
2021-10-25 05:05:11 C 01 42 07.04 -19 55 32.5 u 807
2021-10-25 06:07:41 C 01 42 03.61 -19 57 43.8 o 691
2021-10-25 06:26:34 C 01 42 02.28 -19 58 16.3 o 691
2021-10-25 06:43:22 C 01 42 01.08 -19 58 44.8 o 691
2021-10-28 01:50:19 C 01 37 32.59 -21 52 19.4 u 807
2021-10-28 01:58:01 C 01 37 31.99 -21 52 32.3 u 807
2021-10-28 02:05:41 C 01 37 31.38 -21 52 45.1 u 807
2021-11-01 08:13:05 C 01 30 16.078 -24 41 53.84 U F51
2021-11-01 08:28:45 C 01 30 14.814 -24 42 19.36 U F51
2021-11-01 08:44:26 C 01 30 13.546 -24 42 44.71 U F51
2021-11-01 09:00:05 C 01 30 12.280 -24 43 10.03 U F51
2021-11-07 11:32:36 C 01 19 20.31 -28 27 45.9 V 474
2021-11-07 11:37:40 C 01 19 19.90 -28 27 53.1 V 474
2021-11-07 11:42:45 C 01 19 19.49 -28 28 00.4 V 474
2021-11-07 11:47:49 C 01 19 19.09 -28 28 07.7 V 474
2021-11-15 00:27:16 C 01 06 15.10 -32 28 15.3 u 807
2021-11-15 00:35:01 C 01 06 14.55 -32 28 25.7 u 807
2021-11-15 00:42:52 C 01 06 13.94 -32 28 33.6 u 807
2021-11-16 00:25:26 C 01 04 35.95 -32 56 48.9 u 807
2021-11-16 00:29:29 C 01 04 35.62 -32 56 52.6 u 807
2021-11-16 00:33:23 C 01 04 35.46 -32 56 57.7 u 807
2021-12-01 10:25:03 C 00 43 05.45 -38 53 25.9 V 474
2021-12-01 10:30:07 C 00 43 05.17 -38 53 30.0 V 474
2021-12-01 10:35:11 C 00 43 04.90 -38 53 34.0 V 474
2021-12-01 10:40:15 C 00 43 04.62 -38 53 37.8 V 474
2021-12-16 01:48:43 C 00 28 43.76 -43 18 06.5 W84
2021-12-16 01:50:26 C 00 28 43.67 -43 18 07.7 W84
2021-12-16 01:52:44 C 00 28 43.55 -43 18 09.4 W84
2021-12-16 02:00:53 C 00 28 43.14 -43 18 15.3 W84
2021-12-16 02:14:41 C 00 28 42.46 -43 18 25.3 W84
2021-12-16 02:16:58 C 00 28 42.35 -43 18 26.9 W84
2021-12-16 02:25:08 C 00 28 41.94 -43 18 32.8 W84
2021-12-16 02:37:14 C 00 28 41.35 -43 18 41.4 W84
2021-12-16 02:38:56 C 00 28 41.27 -43 18 42.6 W84
2021-12-16 02:41:13 C 00 28 41.16 -43 18 44.2 W84
2021-12-22 01:21:30 C 00 22 14.73 -45 16 13.3 u 807
2021-12-22 01:29:26 C 00 22 14.29 -45 16 19.5 u 807
2021-12-22 01:37:22 C 00 22 13.80 -45 16 26.6 u 807
2022-01-06 10:19:43 C 23 45 30.36 -51 58 15.7 V 474
2022-01-06 10:29:51 C 23 45 28.44 -51 58 28.0 V 474
2022-03-08 12:13:10 C 17 37 39.73 -09 05 01.0 V I52
2022-03-08 12:14:17 C 17 37 39.74 -09 04 59.3 V I52
2022-03-08 12:18:25 C 17 37 39.62 -09 04 51.7 V I52
2022-03-08 16:38:11 C 17 37 35.36 -08 56 42.7 V 474
2022-03-08 16:48:19 C 17 37 35.11 -08 56 25.5 V 474
2022-03-12 11:21:17 C 17 36 03.02 -06 29 59.9 o 291
2022-03-12 11:27:46 C 17 36 02.86 -06 29 50.0 o 291
2022-03-12 11:34:16 C 17 36 02.70 -06 29 40.0 o 291
2022-03-24 12:06:17 C 17 29 42.61 +00 08 03.0 V I52