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
2025-08-10 17:51:17 C 13 37 23.00 +21 43 29.4 X C40
2025-08-10 17:53:29 C 13 37 23.03 +21 43 26.4 X C40
2025-08-10 17:57:54 C 13 37 23.08 +21 43 19.7 X C40
2025-08-11 20:31:42 C 13 37 41.801 +21 04 40.51 Z C23
2025-08-11 21:10:22 C 13 37 42.192 +21 03 43.85 Z C23
2025-08-12 17:48:32 C 13 37 54.15 +20 33 23.0 X D04
2025-08-12 17:51:16 C 13 37 54.12 +20 33 18.9 X D04
2025-08-12 17:56:44 C 13 37 54.15 +20 33 12.0 X D04
2025-08-12 18:10:23 C 13 37 54.30 +20 32 51.4 X D04
2025-08-12 20:37:48 C 13 37 55.639 +20 29 12.73 Z C23
2025-08-12 21:05:18 C 13 37 55.826 +20 28 30.61 Z C23
2025-08-13 18:45:03 C 13 38 05.44 +19 56 15.8 X C40
2025-08-13 18:47:27 C 13 38 05.44 +19 56 12.4 X C40
2025-08-13 18:49:52 C 13 38 05.47 +19 56 08.5 X C40
2025-08-13 18:52:17 C 13 38 05.48 +19 56 05.1 X C40
2025-08-13 18:54:40 C 13 38 05.51 +19 56 01.4 X C40
2025-08-13 18:57:05 C 13 38 05.51 +19 55 57.8 X C40
2025-08-13 18:59:30 C 13 38 05.53 +19 55 54.3 X C40
2025-08-13 19:01:54 C 13 38 05.58 +19 55 50.7 X C40
2025-08-13 19:04:12 C 13 38 05.57 +19 55 46.9 X C40
2025-08-13 19:06:25 C 13 38 05.53 +19 55 43.6 X C40
2025-08-13 19:08:37 C 13 38 05.58 +19 55 40.3 X C40
2025-08-13 19:10:50 C 13 38 05.58 +19 55 36.7 X C40
2025-08-14 17:49:39 C 13 38 12.55 +19 21 28.7 X D04
2025-08-14 18:00:33 C 13 38 12.65 +19 21 13.1 X D04
2025-08-14 18:11:27 C 13 38 12.66 +19 20 58.3 X D04
2025-08-14 18:28:56 C 13 38 12.90 +19 20 30.5 X C40
2025-08-14 18:31:20 C 13 38 12.91 +19 20 27.2 X C40
2025-08-14 18:33:45 C 13 38 12.90 +19 20 23.1 X C40
2025-08-14 18:36:10 C 13 38 12.94 +19 20 19.9 X C40
2025-08-14 18:38:34 C 13 38 12.94 +19 20 15.9 X C40
2025-08-14 18:40:58 C 13 38 12.94 +19 20 11.8 X C40
2025-08-14 18:48:05 C 13 38 12.95 +19 20 01.1 X C40
2025-08-14 18:50:18 C 13 38 12.97 +19 19 57.7 X C40
2025-08-14 18:52:31 C 13 38 12.99 +19 19 54.2 X C40
2025-08-14 18:54:43 C 13 38 12.97 +19 19 51.8 X C40
2025-08-14 20:36:42 C 13 38 13.498 +19 17 15.54 Z C23
2025-08-14 21:23:55 C 13 38 13.678 +19 16 03.07 Z C23
2025-08-15 06:04:49 C 13 38 15.190 +19 02 58.56 V T05
2025-08-15 06:16:45 C 13 38 15.221 +19 02 40.09 V T05
2025-08-15 06:28:41 C 13 38 15.230 +19 02 22.24 V T05
2025-08-15 06:40:36 C 13 38 15.226 +19 02 04.13 V T05
2025-08-15 17:48:55 C 13 38 16.72 +18 44 54.5 X D04
2025-08-15 18:07:52 C 13 38 16.83 +18 44 24.0 X D04
2025-08-17 17:31:00 C 13 38 12.96 +17 30 40.4 X D04
2025-08-17 17:32:22 C 13 38 12.89 +17 30 38.4 X D04
2025-08-17 17:33:44 C 13 38 12.88 +17 30 36.4 X D04
2025-08-17 17:39:12 C 13 38 12.85 +17 30 26.2 X D04
2025-08-17 17:43:17 C 13 38 12.87 +17 30 21.0 X D04
2025-08-18 20:14:09 C 13 38 03.209 +16 48 07.99 Z C23
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)