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
2023-11-03 08:30:45 C 06 20 05.146 -56 10 41.45 V W68
2025-09-20 14:45:26 C 07 16 44.559 +17 03 19.27 X F51
2025-09-20 14:50:08 C 07 16 45.044 +17 03 07.53 X F51
2025-09-20 14:54:52 C 07 16 45.471 +17 02 55.22 X F51
2025-09-20 14:59:34 C 07 16 45.970 +17 02 43.12 X F51
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)