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
2016-12-28 08:50:59 C 05 17 48.72 +49 50 36.3 R G45
2016-12-28 08:56:43 C 05 17 48.46 +49 50 26.4 R G45
2016-12-28 09:05:19 C 05 17 48.02 +49 50 11.4 R G45
2016-12-31 15:00:09 C 05 15 12.04 +47 43 26.8 q D29
2016-12-31 15:20:31 C 05 15 11.40 +47 42 54.4 q D29
2016-12-31 15:40:52 C 05 15 10.64 +47 42 22.9 q D29
2018-06-19 04:33:41 C 17 41 04.22 -61 42 03.3 q X74
2018-06-19 04:49:02 C 17 41 02.15 -61 42 22.1 q X74
2018-06-19 05:04:21 C 17 41 00.00 -61 42 39.4 q X74
2018-07-18 14:50:58 S 12 29 57.758 -68 36 58.50 L C51
2018-07-18 16:25:13 S 12 28 38.345 -68 32 59.75 L C51
2018-12-16 09:26:05 C 09 16 06.33 +34 19 09.9 V G96
2018-12-16 09:32:16 C 09 16 05.75 +34 19 10.5 V G96
2018-12-16 09:38:26 C 09 16 05.23 +34 19 11.8 V G96
2018-12-16 09:44:36 C 09 16 04.65 +34 19 12.4 V G96
2019-01-03 11:33:31 C 08 29 17.774 +34 33 08.37 U F51
2019-01-03 11:50:40 C 08 29 15.587 +34 33 06.64 U F51
2019-01-03 12:07:59 C 08 29 13.376 +34 33 04.78 U F51
2019-01-03 12:25:18 C 08 29 11.173 +34 33 02.96 U F51
2019-01-04 07:53:27 C 08 26 48.70 +34 30 47.2 V G96
2019-01-04 08:00:56 C 08 26 47.76 +34 30 46.2 V G96
2019-01-04 08:08:26 C 08 26 46.81 +34 30 45.4 V G96
2019-01-04 08:15:54 C 08 26 45.87 +34 30 44.5 V G96
2019-01-08 12:36:27 C 08 14 31.708 +34 14 35.42 U F51
2019-01-08 12:53:55 C 08 14 29.514 +34 14 31.68 U F51
2019-01-08 13:11:14 C 08 14 27.354 +34 14 28.00 U F51
2019-01-08 13:28:36 C 08 14 25.175 +34 14 24.16 U F51
2019-01-30 06:58:02 C 07 23 43.16 +31 11 51.0 V G96
2019-01-30 07:05:32 C 07 23 42.67 +31 11 47.5 V G96
2019-01-30 07:13:02 C 07 23 42.10 +31 11 44.4 V G96
2019-01-30 07:20:34 C 07 23 41.58 +31 11 41.0 V G96
2019-02-04 06:32:48 C 07 16 48.652 +30 20 02.41 U F52
2019-02-04 06:49:20 C 07 16 47.790 +30 19 55.47 U F52
2019-02-04 07:05:56 C 07 16 46.897 +30 19 48.55 U F52
2019-02-04 07:22:29 C 07 16 46.025 +30 19 41.59 U F52
2020-11-25 14:21:33 C 10 06 02.192 +22 42 57.27 U F51
2020-11-25 14:36:55 C 10 06 02.534 +22 42 54.45 U F51
2020-11-25 14:52:27 C 10 06 02.887 +22 42 51.95 U F51
2020-11-25 15:08:01 C 10 06 03.239 +22 42 49.09 U F51
2020-12-15 11:34:38 C 10 07 34.97 +22 03 26.6 V G96
2020-12-15 11:42:08 C 10 07 34.77 +22 03 26.4 V G96
2020-12-15 11:49:39 C 10 07 34.59 +22 03 26.5 V G96
2020-12-15 11:57:13 C 10 07 34.44 +22 03 26.7 V G96
2020-12-26 07:45:10 C 09 58 20.16 +22 19 37.7 V G96
2020-12-26 07:52:34 C 09 58 19.76 +22 19 38.8 V G96
2020-12-26 07:59:55 C 09 58 19.41 +22 19 40.1 V G96
2020-12-26 08:07:18 C 09 58 19.03 +22 19 40.6 V G96
2021-01-16 13:38:26 C 09 20 12.524 +23 25 41.17 U F52
2021-01-16 13:58:47 C 09 20 10.570 +23 25 43.29 U F52
2021-01-16 14:19:15 C 09 20 08.612 +23 25 45.24 U 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)