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
2021-12-01 02:14:28 C 21 30 43.48 -16 02 51.0 o 691
2021-12-03 01:59:20 C 21 43 25.39 -17 12 31.4 o 291
2021-12-03 02:03:00 C 21 43 26.30 -17 12 36.6 o 291
2021-12-03 02:06:39 C 21 43 27.31 -17 12 42.2 o 291
2023-04-24 07:35:10 C 17 21 47.34 +04 47 43.6 u H21
2023-04-24 07:47:42 C 17 21 47.41 +04 48 05.5 u H21
2023-05-11 11:05:54 C 17 18 19.43 +18 12 03.7 o 291
2023-05-11 11:10:14 C 17 18 19.31 +18 12 12.7 o 291
2023-05-11 11:14:33 C 17 18 19.18 +18 12 21.7 o 291
2023-05-26 09:06:33 C 17 03 19.854 +30 41 25.72 X F51
2023-05-26 09:24:17 C 17 03 18.770 +30 42 01.26 X F51
2023-05-26 09:41:59 C 17 03 17.685 +30 42 36.71 X F51
2023-05-26 09:59:49 C 17 03 16.588 +30 43 12.42 X F51
2023-05-28 07:45:22 C 17 00 32.504 +32 13 18.44 V G96
2023-05-28 07:52:54 C 17 00 32.015 +32 13 33.02 V G96
2023-05-28 08:00:30 C 17 00 31.522 +32 13 47.28 V G96
2023-05-28 08:08:10 C 17 00 31.036 +32 14 02.40 V G96
2023-06-10 09:29:53 C 16 37 55.52 +41 13 09.4 o 291
2023-06-10 09:39:35 C 16 37 54.67 +41 13 25.4 o 291
2023-06-10 09:49:18 C 16 37 53.85 +41 13 39.5 o 291
2023-06-16 07:30:26 C 16 26 14.186 +44 23 02.47 V G96
2023-06-16 07:38:32 C 16 26 13.502 +44 23 11.80 V G96
2023-06-16 07:46:38 C 16 26 12.786 +44 23 21.84 V G96
2023-06-16 07:54:44 C 16 26 12.095 +44 23 31.27 V G96
2023-06-27 08:32:44 C 16 04 31.364 +48 42 52.02 V G96
2023-06-27 08:41:12 C 16 04 30.702 +48 42 58.07 V G96
2023-06-27 08:49:41 C 16 04 30.004 +48 43 04.19 V G96
2023-06-27 08:58:09 C 16 04 29.305 +48 43 10.38 V G96
2023-07-30 09:14:15 C 15 24 54.707 +53 35 01.76 X F51
2023-07-30 09:31:54 C 15 24 54.323 +53 35 03.27 X F51
2023-07-30 09:49:31 C 15 24 53.947 +53 35 05.13 X F51
2023-08-04 07:51:21 C 15 23 09.650 +53 49 46.19 X F51
2023-08-04 08:08:58 C 15 23 09.388 +53 49 47.63 X F51
2023-08-04 08:17:34 C 15 23 09.248 +53 49 48.50 X F52
2023-08-04 08:26:38 C 15 23 09.095 +53 49 48.69 X F51
2023-08-04 08:35:03 C 15 23 08.996 +53 49 49.42 X F52
2023-08-04 08:44:15 C 15 23 08.841 +53 49 50.39 X F51
2023-08-04 08:52:44 C 15 23 08.771 +53 49 51.29 X F52
2023-08-04 09:10:21 C 15 23 08.481 +53 49 52.42 X F52
2023-10-28 05:18:44 C 08 09 37.459 -43 32 42.29 V W68
2023-10-28 05:22:45 C 08 09 32.633 -43 33 33.62 V W68
2023-10-28 05:26:47 C 08 09 27.883 -43 34 31.37 V W68
2023-10-28 06:17:45 C 08 08 26.681 -43 45 54.25 V W68
2023-11-01 22:54:12 C 06 36 30.694 -55 02 56.54 V M22
2023-11-01 22:58:21 C 06 36 28.363 -55 03 07.45 V M22
2023-11-01 23:03:54 C 06 36 25.282 -55 03 22.03 V M22
2023-11-01 23:13:21 C 06 36 19.915 -55 03 46.94 V M22
2023-11-03 07:58:46 C 06 20 20.196 -56 09 49.03 V W68
2023-11-03 08:03:29 C 06 20 17.971 -56 09 56.81 V W68
2023-11-03 08:18:18 C 06 20 10.994 -56 10 21.36 V W68
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)