2021 PH4

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.6494555327 ± 6.25e-06
Semi-major axis (a)2.7156759734 AU ± 4.79e-05
Inclination (i)6.73121605° ± 4.81e-05
Long. of Asc. Node (Ω)58.10620833° ± 7.72e-05
Arg. of Perihelion (ω)330.54051630° ± 8.57e-05
Mean Anomaly (M)328.47744904° ± 8.66e-03
Mean Motion (n)0.2202395704°/day ± 5.82e-06
Perihelion dist (q)0.95196519 AU ± 2.39e-05
Aphelion dist (Q)4.47938676 AU ± 8.08e-05
Orbital Period4.47524612 yr ± 1.18e-04
Physical Parameters
H (abs. magnitude)21.20
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.213″
Uncertainty1
Orbit TypeApollo
MOID0.006824 AU
Observations Used73
Oppositions1
Arc Total2021-2022
First Observation Used2021-08-07
Last Observation Used2022-01-28
Observations (94)
Date Type RA Dec Mag Band Observatory
2021-08-07 09:26:42 C 20 33 31.512 -42 32 03.74 U F51
2021-08-07 09:38:00 C 20 33 30.672 -42 32 16.35 U F51
2021-08-07 09:49:17 C 20 33 29.861 -42 32 28.27 U F51
2021-08-07 10:00:32 C 20 33 29.043 -42 32 40.40 U F51
2021-08-08 09:15:29 C 20 31 58.412 -42 57 50.90 V 568
2021-08-08 09:16:55 C 20 31 58.305 -42 57 52.46 V 568
2021-08-08 09:18:19 C 20 31 58.200 -42 57 54.03 V 568
2021-08-09 02:14:38 C 20 30 50.69 -43 16 05.2 V W94
2021-08-09 02:22:57 C 20 30 50.01 -43 16 14.5 V W94
2021-08-09 02:31:23 C 20 30 49.36 -43 16 24.6 V W94
2021-08-09 03:08:48 C 20 30 46.57 -43 17 04.9 V W95
2021-08-09 03:16:19 C 20 30 45.97 -43 17 13.7 V W95
2021-08-09 03:23:49 C 20 30 45.46 -43 17 21.8 V W95
2021-08-09 04:08:31 C 20 30 41.75 -43 18 10.9 V W94
2021-08-09 04:16:42 C 20 30 41.30 -43 18 19.2 V W94
2021-08-09 04:24:49 C 20 30 40.73 -43 18 28.3 V W94
2021-08-09 12:29:47 C 20 30 07.67 -43 27 08.1 V 474
2021-08-09 12:34:51 C 20 30 07.31 -43 27 13.7 V 474
2021-08-09 12:39:55 C 20 30 06.91 -43 27 19.2 V 474
2021-08-10 01:48:13 C 20 29 12.81 -43 41 48.7 X Y00
2021-08-10 01:56:37 C 20 29 12.16 -43 41 58.1 X Y00
2021-08-10 02:05:00 C 20 29 11.52 -43 42 07.6 X Y00
2021-08-11 00:24:32 C 20 27 36.464 -44 06 45.63 V J04
2021-08-11 00:29:17 C 20 27 36.074 -44 06 50.50 V J04
2021-08-12 00:06:54 C 20 25 53.046 -44 32 45.13 V J04
2021-08-13 10:41:41 C 20 23 16.271 -45 10 41.20 V T12
2021-08-13 10:42:39 C 20 23 16.189 -45 10 42.17 V T12
2021-08-13 10:43:47 C 20 23 16.092 -45 10 43.36 V T12
2021-08-14 08:03:47 C 20 21 39.17 -45 33 45.0 V 474
2021-08-14 08:08:51 C 20 21 38.71 -45 33 50.5 V 474
2021-08-14 08:13:40 C 20 21 38.28 -45 33 56.0 V 474
2021-08-14 08:18:59 C 20 21 37.87 -45 34 02.3 V 474
2021-08-18 02:09:17 C 20 14 17.67 -47 12 49.6 u 807
2021-08-18 02:17:55 C 20 14 16.84 -47 12 59.2 u 807
2021-08-18 02:26:38 C 20 14 16.02 -47 13 08.8 u 807
2021-08-27 01:14:43 C 19 54 38.82 -51 05 35.9 u 807
2021-08-27 01:19:25 C 19 54 38.33 -51 05 41.1 u 807
2021-08-27 01:23:58 C 19 54 37.86 -51 05 46.0 u 807
2021-09-05 23:57:52 C 19 30 03.22 -55 18 57.1 u 807
2021-09-06 00:01:59 C 19 30 02.72 -55 19 02.0 u 807
2021-09-06 00:05:50 C 19 30 02.16 -55 19 06.4 u 807
2021-09-11 07:14:13 S 19 15 35.31 -57 38 10.2 L C51
2021-09-11 07:14:24 S 19 15 35.28 -57 38 10.9 L C51
2021-09-11 10:22:31 S 19 15 12.97 -57 41 44.2 L C51
2021-09-11 13:30:39 S 19 14 50.26 -57 45 17.1 L C51
2021-09-11 15:04:44 S 19 14 39.00 -57 47 04.1 L C51
2021-09-11 15:04:54 S 19 14 39.03 -57 47 04.8 L C51
2021-09-11 16:38:59 S 19 14 27.68 -57 48 51.4 L C51
2021-09-11 18:13:02 S 19 14 16.25 -57 50 37.8 L C51
2021-09-11 19:47:07 S 19 14 05.04 -57 52 25.6 L C51