137170 (1999 HF1)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4625092333 ± 7.37e-09
Semi-major axis (a)0.8191205796 AU ± 6.91e-11
Inclination (i)25.65676684° ± 6.33e-07
Long. of Asc. Node (Ω)155.84265542° ± 1.66e-06
Arg. of Perihelion (ω)253.41802715° ± 1.46e-06
Mean Anomaly (M)60.85489352° ± 1.85e-06
Mean Motion (n)1.3295066693°/day ± 1.68e-10
Perihelion dist (q)0.44026975 AU ± 6.04e-09
Aphelion dist (Q)1.19797141 AU ± 6.04e-09
Orbital Period0.74134738 yr ± 9.38e-11
Physical Parameters
H (abs. magnitude)14.66
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.179″
Uncertainty0
Orbit TypeAten
MOID0.173761 AU
Observations Used8344
Radar Obs Used1
Gaia Obs Used16
Oppositions6
Arc Total1999-2017
First Observation Used1999-04-20
Last Observation Used2025-08-18
Observations (8901)
Date Type RA Dec Mag Band Observatory
2022-07-03 20:12:50 C 12 54 20.80 +35 52 46.5 V C40
2022-07-03 20:14:35 C 12 54 20.90 +35 52 44.5 V C40
2022-07-03 20:17:04 C 12 54 21.04 +35 52 41.8 V C40
2022-07-03 20:17:25 C 12 54 21.06 +35 52 41.4 V C40
2022-07-03 20:19:52 C 12 54 21.19 +35 52 38.7 V C40
2022-07-03 20:46:03 C 12 54 22.80 +35 52 11.6 X L63
2022-07-03 21:14:34 C 12 54 24.37 +35 51 40.3 X L63
2022-07-03 21:25:29 C 12 54 25.05 +35 51 27.6 V C23
2022-07-03 21:25:41 C 12 54 24.99 +35 51 28.4 X L63
2022-07-03 21:28:57 C 12 54 25.23 +35 51 23.4 V C23
2022-07-03 21:35:26 C 12 54 25.61 +35 51 16.8 V C23
2022-07-03 21:37:45 C 12 54 25.73 +35 51 13.9 V C23
2022-07-04 06:20:37 C 12 54 55.625 +35 41 50.82 V T08
2022-07-04 06:28:52 C 12 54 56.076 +35 41 41.60 V T08
2022-07-04 06:51:18 C 12 54 57.283 +35 41 16.87 V T08
2022-07-04 07:13:26 C 12 54 58.495 +35 40 52.61 V T08
2022-07-04 18:39:16 C 12 55 37.72 +35 28 19.5 V C40
2022-07-04 18:45:26 C 12 55 38.06 +35 28 12.8 V C40
2022-07-04 18:50:15 C 12 55 38.32 +35 28 07.5 V C40
2022-07-04 18:51:36 C 12 55 38.39 +35 28 06.0 V C40
2022-07-04 18:52:18 C 12 55 38.43 +35 28 05.2 V C40
2022-07-04 18:52:58 C 12 55 38.47 +35 28 04.4 V C40
2022-07-04 18:53:40 C 12 55 38.51 +35 28 03.7 V C40
2022-07-04 19:18:20 C 12 55 39.88 +35 27 36.3 V C40
2022-07-04 19:20:22 C 12 55 39.99 +35 27 34.1 V C40
2022-07-04 19:21:45 C 12 55 40.07 +35 27 32.5 V C40
2022-07-04 19:29:59 C 12 55 40.53 +35 27 23.5 V C40
2022-07-04 19:42:59 C 12 55 41.25 +35 27 09.0 V C40
2022-07-04 19:56:40 C 12 55 42.03 +35 26 53.9 V C40
2022-07-04 20:00:48 C 12 55 42.26 +35 26 49.3 V C40
2022-07-05 18:06:54 C 12 56 58.35 +35 02 44.0 V C40
2022-07-05 18:08:58 C 12 56 58.47 +35 02 41.7 V C40
2022-07-05 18:20:37 C 12 56 59.12 +35 02 28.7 V C40
2022-07-05 18:21:17 C 12 56 59.15 +35 02 28.0 V C40
2022-07-05 18:23:21 C 12 56 59.27 +35 02 25.7 V C40
2022-07-05 18:26:05 C 12 56 59.42 +35 02 22.7 V C40
2022-07-05 18:30:11 C 12 56 59.65 +35 02 18.1 V C40
2022-07-05 18:41:10 C 12 57 00.26 +35 02 06.1 V C40
2022-07-05 18:41:50 C 12 57 00.30 +35 02 05.3 V C40
2022-07-05 18:42:32 C 12 57 00.34 +35 02 04.5 V C40
2022-07-05 18:47:59 C 12 57 00.64 +35 01 58.5 V C40
2022-07-05 18:52:48 C 12 57 00.91 +35 01 53.2 V C40
2022-07-05 18:53:28 C 12 57 00.94 +35 01 52.5 V C40
2022-07-05 18:54:11 C 12 57 00.99 +35 01 51.6 V C40
2022-07-05 19:00:20 C 12 57 01.33 +35 01 44.9 V C40
2022-07-05 19:06:29 C 12 57 01.67 +35 01 38.0 V C40
2022-07-05 19:07:52 C 12 57 01.75 +35 01 36.5 V C40
2022-07-05 19:13:21 C 12 57 02.06 +35 01 30.5 V C40
2022-07-05 19:14:01 C 12 57 02.10 +35 01 29.7 V C40
2022-07-05 19:14:43 C 12 57 02.14 +35 01 29.0 V C40
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2022-03-19 21:40:00 186720536 10 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)