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
2021-09-11 21:21:10 S 19 13 53.70 -57 54 12.5 L C51
2021-09-12 00:29:30 S 19 13 30.90 -57 57 48.3 L C51
2021-09-15 13:10:13 S 19 02 41.938 -59 38 05.50 L C51
2021-09-25 09:39:10 C 18 19 08.27 -65 15 01.6 V E10
2021-09-25 09:39:55 C 18 19 08.06 -65 15 02.7 V E10
2021-09-25 09:40:41 C 18 19 07.83 -65 15 04.0 V E10
2021-10-25 12:21:55 C 10 02 38.42 -23 37 51.3 V 291
2021-10-25 12:28:35 C 10 02 36.98 -23 36 50.4 V 291
2021-10-27 12:17:02 C 09 54 31.46 -16 36 42.6 V I52
2021-10-27 12:20:21 C 09 54 30.89 -16 36 14.1 V I52
2021-10-27 12:23:40 C 09 54 30.28 -16 35 47.3 V I52
2021-11-07 14:22:45 C 09 31 26.205 +09 01 12.68 U F51
2021-11-07 14:56:10 C 09 31 23.972 +09 03 19.50 U F51
2021-11-07 15:12:55 C 09 31 22.846 +09 04 22.66 U F51
2021-11-11 13:46:09 S 09 27 04.34 +14 18 14.2 L C51
2021-11-11 14:56:12 C 09 27 05.166 +14 21 16.83 U F51
2021-11-11 15:03:34 C 09 27 04.746 +14 21 38.53 U F51
2021-11-11 16:54:16 S 09 26 56.71 +14 27 20.7 L C51
2021-11-11 18:28:21 S 09 26 52.90 +14 31 52.2 L C51
2021-11-11 20:02:24 S 09 26 49.09 +14 36 22.6 L C51
2021-11-11 21:36:29 S 09 26 45.26 +14 40 52.7 L C51
2021-11-12 00:44:37 S 09 26 37.73 +14 49 48.0 L C51
2021-11-12 03:52:45 S 09 26 30.20 +14 58 39.6 L C51
2021-12-04 11:34:33 C 09 02 11.98 +30 28 11.4 o 691
2021-12-04 11:41:57 C 09 02 11.45 +30 28 20.5 o 691
2021-12-04 11:49:21 C 09 02 10.92 +30 28 28.1 o 691
2021-12-16 00:13:15 C 08 41 08.47 +34 40 53.9 X C95
2021-12-16 00:56:17 C 08 41 04.50 +34 41 24.9 X C95
2021-12-17 08:03:22 C 08 38 22.05 +35 03 17.5 V G96
2021-12-17 08:11:36 C 08 38 21.26 +35 03 23.4 V G96
2021-12-17 08:19:49 C 08 38 20.48 +35 03 29.2 V G96
2021-12-17 08:28:04 C 08 38 19.68 +35 03 35.3 V G96
2021-12-19 08:24:51 C 08 34 03.14 +35 34 33.5 V 695
2021-12-19 08:40:40 C 08 34 01.60 +35 34 43.7 V 695
2021-12-19 08:56:29 C 08 34 00.04 +35 34 53.6 V 695
2022-01-10 06:35:32 C 07 47 50.21 +38 00 24.2 V G96
2022-01-10 06:43:08 C 07 47 49.63 +38 00 23.7 V G96
2022-01-10 06:50:41 C 07 47 49.05 +38 00 23.7 V G96
2022-01-10 08:55:10 C 07 47 40.322 +38 00 24.52 U F52
2022-01-10 09:10:45 C 07 47 39.106 +38 00 24.49 U F52
2022-01-10 09:26:14 C 07 47 37.880 +38 00 24.24 U F52
2022-01-10 09:41:51 C 07 47 36.635 +38 00 24.40 U F52
2022-01-28 08:29:11 C 07 25 40.91 +36 52 52.3 o 291
2022-01-28 08:45:21 C 07 25 40.41 +36 52 47.9 o 291