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
2022-07-28 19:35:35 C 13 29 46.04 +24 46 59.1 V C40
2022-07-28 19:39:40 C 13 29 46.29 +24 46 54.4 V C40
2022-07-28 19:50:38 C 13 29 46.95 +24 46 41.7 V C40
2022-07-28 20:07:30 C 13 29 47.96 +24 46 22.0 V C40
2022-07-29 19:16:00 C 13 31 11.97 +24 19 44.7 V C40
2022-07-29 19:36:33 C 13 31 13.21 +24 19 20.5 V C40
2022-07-29 19:42:42 C 13 31 13.58 +24 19 13.3 V C40
2022-07-29 20:05:19 C 13 31 14.94 +24 18 46.9 V C40
2022-07-29 20:17:46 C 13 31 15.69 +24 18 32.3 V C40
2022-07-29 21:32:50 C 13 31 20.34 +24 17 05.9 V C23
2022-07-29 21:33:55 C 13 31 20.34 +24 17 02.0 V C23
2022-07-31 17:54:37 C 13 34 01.37 +23 25 44.7 V C40
2022-07-31 17:58:04 C 13 34 01.57 +23 25 40.7 V C40
2022-07-31 17:58:44 C 13 34 01.61 +23 25 39.8 V C40
2022-07-31 18:02:51 C 13 34 01.85 +23 25 35.0 V C40
2022-07-31 18:06:58 C 13 34 02.10 +23 25 30.2 V C40
2022-07-31 18:09:00 C 13 34 02.22 +23 25 27.8 V C40
2022-07-31 18:11:45 C 13 34 02.39 +23 25 24.6 V C40
2022-07-31 18:15:10 C 13 34 02.59 +23 25 20.6 V C40
2022-07-31 18:25:26 C 13 34 03.20 +23 25 08.5 V C40
2022-07-31 18:26:08 C 13 34 03.23 +23 25 07.7 V C40
2022-07-31 18:26:48 C 13 34 03.28 +23 25 06.9 V C40
2022-07-31 18:31:37 C 13 34 03.56 +23 25 01.3 V C40
2022-07-31 18:34:22 C 13 34 03.73 +23 24 58.0 V C40
2022-07-31 18:59:18 C 13 34 05.21 +23 24 28.8 V C40
2022-07-31 19:13:01 C 13 34 06.03 +23 24 12.6 V C40
2022-08-03 19:00:50 C 13 38 26.24 +22 00 08.5 V C40
2022-08-03 19:02:53 C 13 38 26.36 +22 00 05.9 V C40
2022-08-03 19:05:37 C 13 38 26.53 +22 00 02.7 V C40
2022-08-03 19:09:44 C 13 38 26.77 +21 59 57.7 V C40
2022-08-03 19:12:27 C 13 38 26.93 +21 59 54.5 V C40
2022-08-03 19:17:16 C 13 38 27.22 +21 59 48.8 V C40
2022-08-03 19:53:53 C 13 38 29.40 +21 59 04.9 V C40
2022-08-04 07:39:11 C 13 39 11.806 +21 45 16.92 V T08
2022-08-04 07:51:39 C 13 39 12.545 +21 45 02.20 V T08
2022-08-04 08:08:06 C 13 39 13.522 +21 44 42.32 V T08
2022-08-05 18:43:11 C 13 41 18.53 +21 03 36.2 V C40
2022-08-05 18:43:51 C 13 41 18.57 +21 03 35.4 V C40
2022-08-05 19:13:18 C 13 41 20.34 +21 03 00.0 V C40
2022-08-05 19:50:07 C 13 41 22.57 +21 02 16.0 V C40
2022-08-06 06:05:03 C 13 41 59.477 +20 50 07.94 V T05
2022-08-06 06:10:17 C 13 41 59.779 +20 50 01.86 V T05
2022-08-06 06:18:50 C 13 42 00.276 +20 49 51.53 V T05
2022-08-06 06:33:16 C 13 42 01.118 +20 49 33.96 V T05
2022-08-07 18:49:52 C 13 44 11.43 +20 05 59.1 V C40
2022-08-07 19:04:56 C 13 44 12.32 +20 05 40.7 V C40
2022-08-07 19:07:00 C 13 44 12.44 +20 05 38.3 V C40
2022-08-07 19:20:01 C 13 44 13.22 +20 05 22.4 V C40
2022-08-07 19:47:30 C 13 44 14.85 +20 04 48.9 V C40
2022-08-08 17:49:35 C 13 45 33.73 +19 38 13.5 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)