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
2017-04-09 02:15:38 C 19 38 47.85 +17 33 19.7 q 160
2017-04-09 02:17:45 C 19 38 48.07 +17 33 22.2 q 160
2017-04-09 02:19:52 C 19 38 48.30 +17 33 24.7 q 160
2017-04-12 09:41:41 C 19 47 10.39 +19 04 55.0 u H21
2017-04-12 09:43:38 C 19 47 10.59 +19 04 57.3 u H21
2017-04-12 09:45:36 C 19 47 10.79 +19 04 59.6 u H21
2017-04-12 09:47:34 C 19 47 11.00 +19 05 02.0 u H21
2017-04-12 09:49:31 C 19 47 11.21 +19 05 04.4 u H21
2017-04-12 09:51:29 C 19 47 11.42 +19 05 06.5 u H21
2017-04-12 09:53:26 C 19 47 11.62 +19 05 08.8 u H21
2017-04-12 09:55:24 C 19 47 11.82 +19 05 11.2 u H21
2017-04-12 09:57:22 C 19 47 12.03 +19 05 13.5 u H21
2017-04-12 09:59:25 C 19 47 12.26 +19 05 15.8 u H21
2017-04-21 02:38:31 C 20 09 59.46 +23 14 57.4 q 160
2017-04-21 02:40:44 C 20 09 59.70 +23 15 00.1 q 160
2017-04-21 02:42:37 C 20 09 59.91 +23 15 02.7 q 160
2017-04-22 02:34:35 C 20 12 42.05 +23 44 25.4 q 160
2017-04-22 02:36:34 C 20 12 42.28 +23 44 28.0 q 160
2017-04-22 02:38:33 C 20 12 42.49 +23 44 30.4 q 160
2017-05-17 02:42:12 C 21 34 30.87 +36 42 23.5 q 160
2017-05-17 02:44:06 C 21 34 31.18 +36 42 26.0 q 160
2017-05-17 02:46:00 C 21 34 31.51 +36 42 28.6 q 160
2017-05-18 02:44:41 C 21 38 43.30 +37 14 07.7 q 160
2017-05-18 02:46:41 C 21 38 43.64 +37 14 10.4 q 160
2017-05-18 02:48:40 C 21 38 44.00 +37 14 12.9 q 160
2017-05-25 01:27:50 C 22 11 18.38 +40 49 32.2 q Z80
2017-05-25 01:29:34 C 22 11 18.71 +40 49 34.2 q Z80
2017-05-25 01:31:18 C 22 11 19.11 +40 49 36.5 q Z80
2017-05-25 01:33:03 C 22 11 19.47 +40 49 38.7 q Z80
2017-05-25 01:34:47 C 22 11 19.83 +40 49 40.8 q Z80
2017-05-25 01:36:32 C 22 11 20.20 +40 49 43.1 q Z80
2017-05-25 01:38:16 C 22 11 20.58 +40 49 45.5 q Z80
2017-05-25 01:40:01 C 22 11 20.96 +40 49 47.5 q Z80
2017-05-25 01:41:45 C 22 11 21.31 +40 49 49.7 q Z80
2017-05-29 10:23:35 C 22 35 32.77 +42 56 33.7 q 703
2017-05-29 10:31:45 C 22 35 34.75 +42 56 43.6 q 703
2017-05-29 10:39:54 C 22 35 36.79 +42 56 53.4 q 703
2017-05-29 10:48:03 C 22 35 38.75 +42 57 02.7 q 703
2017-06-02 00:24:41 C 22 58 05.15 +44 30 53.3 q 089
2017-06-02 00:27:32 C 22 58 05.93 +44 30 56.2 q 089
2017-06-02 00:30:23 C 22 58 06.72 +44 30 59.2 q 089
2017-06-02 00:33:14 C 22 58 07.52 +44 31 02.4 q 089
2017-06-04 23:22:23 C 23 18 44.44 +45 38 52.2 q Z45
2017-06-04 23:29:40 C 23 18 46.57 +45 38 55.1 q Z45
2017-06-07 00:20:31 C 23 34 08.49 +46 19 03.0 q 089
2017-06-07 00:23:22 C 23 34 09.44 +46 19 05.3 q 089
2017-06-07 00:26:12 C 23 34 10.34 +46 19 07.4 q 089
2017-06-07 00:31:55 C 23 34 12.17 +46 19 11.8 q 089
2017-06-07 00:34:46 C 23 34 13.10 +46 19 14.1 q 089
2017-06-07 00:37:37 C 23 34 14.02 +46 19 16.1 q 089
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)