420591 (2012 HF31)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4425729540 ± 1.37e-08
Semi-major axis (a)1.5536559513 AU ± 3.62e-09
Inclination (i)9.10585674° ± 2.44e-06
Long. of Asc. Node (Ω)325.71200872° ± 1.92e-05
Arg. of Perihelion (ω)30.37588451° ± 2.01e-05
Mean Anomaly (M)259.91453518° ± 5.47e-06
Mean Motion (n)0.5089557166°/day ± 1.78e-09
Perihelion dist (q)0.86604985 AU ± 2.14e-08
Aphelion dist (Q)2.24126206 AU ± 2.20e-08
Orbital Period1.93656590 yr ± 6.78e-09
Physical Parameters
H (abs. magnitude)19.49
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual0.159″
Uncertainty0
Orbit TypeApollo
MOID0.068212 AU
Observations Used150
Radar Obs Used2
Oppositions9
Arc Total2000-2018
First Observation Used2000-02-12
Last Observation Used2025-03-03
Observations (175)
Date Type RA Dec Mag Band Observatory
2021-01-18 08:18:20 C 09 16 12.93 +23 30 03.8 V G96
2021-01-18 08:25:44 C 09 16 12.20 +23 30 04.9 V G96
2021-01-18 08:33:08 C 09 16 11.48 +23 30 05.5 V G96
2021-01-18 08:40:30 C 09 16 10.76 +23 30 06.5 V G96
2021-02-05 05:48:35 C 08 36 54.37 +23 38 30.6 V G96
2021-02-05 05:56:39 C 08 36 53.72 +23 38 29.8 V G96
2021-02-05 06:04:42 C 08 36 53.03 +23 38 29.6 V G96
2021-02-05 06:12:45 C 08 36 52.33 +23 38 28.9 V G96
2021-02-10 07:43:22 C 08 27 35.241 +23 28 36.58 U F51
2021-02-10 08:02:33 C 08 27 33.827 +23 28 34.89 U F51
2021-02-10 08:21:44 C 08 27 32.415 +23 28 33.03 U F51
2023-01-22 09:54:35 C 10 04 00.190 +15 48 09.60 U F52
2023-01-22 10:14:10 C 10 03 58.705 +15 48 12.99 U F52
2023-01-22 10:33:43 C 10 03 57.214 +15 48 15.97 U F52
2023-01-22 10:53:25 C 10 03 55.711 +15 48 19.54 U F52
2023-01-22 11:13:39 C 10 03 54.163 +15 48 22.68 U F52
2023-01-22 11:29:19 C 10 03 52.955 +15 48 25.64 U F52
2023-01-22 11:45:04 C 10 03 51.738 +15 48 28.20 U F52
2024-12-25 12:26:26 C 11 01 06.309 +09 34 33.17 X F52
2024-12-25 12:43:01 C 11 01 06.246 +09 34 31.26 X F52
2024-12-25 13:16:09 C 11 01 06.155 +09 34 27.26 X F52
2025-03-03 06:54:19 C 09 36 18.479 +12 23 22.19 X F52
2025-03-03 07:10:47 C 09 36 17.454 +12 23 24.36 X F52
2025-03-03 07:27:17 C 09 36 16.422 +12 23 26.70 X F52
2025-03-03 07:43:52 C 09 36 15.409 +12 23 29.00 X F52
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2018-08-09 15:21:00 -106101.464 0.3 Hz 2380 -1 -1
2018-08-13 16:14:00 -139851.1548 0.02 Hz 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)