873204 (2019 HH4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3870985550 ± 1.46e-08
Semi-major axis (a)1.5316060712 AU ± 5.73e-09
Inclination (i)33.85720037° ± 2.89e-06
Long. of Asc. Node (Ω)211.46152915° ± 1.43e-06
Arg. of Perihelion (ω)150.69538924° ± 5.54e-06
Mean Anomaly (M)46.95514482° ± 2.75e-06
Mean Motion (n)0.5199860077°/day ± 2.92e-09
Perihelion dist (q)0.93872357 AU ± 2.26e-08
Aphelion dist (Q)2.12448857 AU ± 2.37e-08
Orbital Period1.89548616 yr ± 1.06e-08
Physical Parameters
H (abs. magnitude)19.83
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.248″
Uncertainty0
Orbit TypeApollo
MOID0.021598 AU
Observations Used151
Radar Obs Used8
Oppositions9
Arc Total2004-2025
First Observation Used2004-05-14
Last Observation Used2025-09-20
Observations (155)
Date Type RA Dec Mag Band Observatory
2019-06-22 04:41:23 C 13 09 12.56 +08 58 20.8 o 695
2019-06-22 04:57:50 C 13 09 12.84 +08 58 25.8 o 695
2020-01-23 05:23:49 C 23 57 40.890 -09 18 42.46 V F51
2020-01-23 05:30:44 C 23 57 42.172 -09 18 43.05 V F51
2020-01-23 05:37:36 C 23 57 43.516 -09 18 43.32 V F51
2021-03-23 08:46:56 C 15 44 34.19 -17 59 57.9 o 291
2021-03-23 08:59:53 C 15 44 34.22 -17 59 49.0 o 291
2021-04-03 08:47:41 C 15 43 33.72 -14 19 18.0 o 291
2021-04-03 09:10:34 C 15 43 33.38 -14 18 56.3 o 291
2021-04-03 09:33:26 C 15 43 33.02 -14 18 34.4 o 291
2021-04-10 10:08:58 C 15 40 05.74 -11 20 57.6 o 691
2021-04-10 10:44:43 C 15 40 04.69 -11 20 16.2 o 691
2021-05-01 10:13:23 C 15 16 44.01 +00 06 50.0 o 691
2021-05-01 10:36:10 C 15 16 42.63 +00 07 25.7 o 691
2021-05-01 10:58:59 C 15 16 41.15 +00 07 59.9 o 691
2021-05-03 10:49:57 C 15 13 37.93 +01 20 50.2 o 691
2021-05-03 11:11:38 C 15 13 36.41 +01 21 24.3 o 691
2021-05-06 08:42:48 C 15 09 00.26 +03 07 23.2 o 291
2021-05-06 08:47:05 C 15 08 59.96 +03 07 29.9 o 291
2021-05-13 08:40:10 C 14 57 21.97 +07 17 55.5 o 691
2021-05-13 09:07:11 C 14 57 20.05 +07 18 34.5 o 691
2021-05-13 09:34:05 C 14 57 18.07 +07 19 13.5 o 691
2021-05-20 05:26:28 C 14 45 55.63 +11 04 41.3 V G96
2021-05-20 05:33:51 C 14 45 55.12 +11 04 52.0 V G96
2021-05-20 05:41:14 C 14 45 54.63 +11 05 00.1 V G96
2021-05-20 05:48:36 C 14 45 54.09 +11 05 10.4 V G96
2021-05-30 07:33:07 C 14 30 40.31 +15 42 48.3 o 691
2021-05-30 07:56:19 C 14 30 39.00 +15 43 11.7 o 691
2021-05-30 08:19:31 C 14 30 37.56 +15 43 34.3 o 691
2021-06-11 06:09:50 C 14 17 14.36 +19 33 50.6 o 691
2021-06-11 06:35:20 C 14 17 13.37 +19 34 06.6 o 691
2021-06-11 07:00:42 C 14 17 12.42 +19 34 22.4 o 691
2021-08-05 04:34:16 C 14 34 27.55 +22 14 48.1 o 291
2021-08-05 04:59:19 C 14 34 28.90 +22 14 43.3 o 291
2021-10-02 02:44:08 C 16 39 34.29 +14 14 54.7 o 291
2021-10-02 02:55:19 C 16 39 35.75 +14 14 47.9 o 291
2021-10-02 03:06:28 C 16 39 37.17 +14 14 41.0 o 291
2021-10-09 02:21:58 C 17 02 37.07 +12 24 35.5 o 691
2021-10-09 02:40:41 C 17 02 39.77 +12 24 22.2 o 691
2021-10-16 02:52:05 C 17 28 12.06 +10 10 47.3 o 291
2021-10-16 03:01:47 C 17 28 13.61 +10 10 38.5 o 291
2021-11-12 02:03:36 C 19 34 42.60 -03 24 38.8 o 291
2021-11-12 02:24:12 C 19 34 47.32 -03 25 13.0 o 291
2021-11-14 01:57:44 C 19 46 03.19 -04 43 59.7 o 291
2021-11-14 02:16:41 C 19 46 07.66 -04 44 32.0 o 291
2021-11-14 02:35:37 C 19 46 12.13 -04 45 03.3 o 291
2021-11-27 01:34:15 C 21 05 05.25 -13 31 37.9 o 691
2021-11-27 01:47:27 C 21 05 08.64 -13 31 59.2 o 691
2021-12-01 01:42:58 C 21 30 35.14 -16 02 04.5 o 691
2021-12-01 01:58:42 C 21 30 39.28 -16 02 27.0 o 691
Radar Observations (8)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2023-10-20 12:20:00 932671.326 0.2 Hz 8560 -14 -14
2023-10-20 12:40:00 56529006.18 2 us 8560 -14 -14
2023-10-20 13:20:00 56268166.96 0.5 us 8560 -14 -14
2023-10-21 13:00:00 47672888.84 0.375 us 8560 -14 -14
2023-10-22 12:20:00 648399.423 0.2 Hz 8560 -14 -14
2023-10-22 12:50:00 40431859.42 0.5 us 8560 -14 -14
2023-10-23 11:50:00 374061.773 0.2 Hz 8560 -14 -14
2023-10-23 12:00:00 35596019.69 0.5 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)