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
2025-07-10 19:55:55 C 13 18 47.53 +37 42 35.9 X C40
2025-07-10 19:58:08 C 13 18 47.62 +37 42 33.5 X C40
2025-07-10 20:00:21 C 13 18 47.66 +37 42 30.9 X C40
2025-07-10 20:05:17 C 13 18 47.72 +37 42 24.4 X D04
2025-07-10 20:19:55 C 13 18 48.18 +37 42 06.7 X D04
2025-07-10 20:33:11 C 13 18 48.43 +37 41 50.4 X D04
2025-07-10 20:41:51 C 13 18 48.72 +37 41 39.5 X D04
2025-07-10 20:46:11 C 13 18 48.78 +37 41 34.7 X D04
2025-07-10 20:50:31 C 13 18 48.86 +37 41 29.5 X D04
2025-07-10 20:54:51 C 13 18 48.99 +37 41 23.9 X D04
2025-07-10 21:22:39 C 13 18 49.922 +37 40 52.21 Z C23
2025-07-10 22:22:37 C 13 18 51.418 +37 39 38.84 Z C23
2025-07-10 22:40:02 C 13 18 51.77 +37 39 20.3 X Z03
2025-07-10 23:24:21 C 13 18 52.87 +37 38 26.0 X Z03
2025-07-11 00:08:51 C 13 18 54.01 +37 37 31.9 X Z03
2025-07-11 19:15:22 C 13 19 24.24 +37 14 35.9 X C40
2025-07-11 19:17:48 C 13 19 24.30 +37 14 32.9 X C40
2025-07-11 19:20:13 C 13 19 24.36 +37 14 29.9 X C40
2025-07-11 19:22:37 C 13 19 24.42 +37 14 27.0 X C40
2025-07-11 19:25:02 C 13 19 24.47 +37 14 24.1 X C40
2025-07-11 19:27:27 C 13 19 24.55 +37 14 21.2 X C40
2025-07-11 19:29:51 C 13 19 24.61 +37 14 18.1 X C40
2025-07-11 19:32:15 C 13 19 24.65 +37 14 15.3 X C40
2025-07-11 19:34:33 C 13 19 24.71 +37 14 12.4 X C40
2025-07-11 19:35:17 C 13 19 24.74 +37 14 11.9 X D04
2025-07-11 19:36:46 C 13 19 24.79 +37 14 09.7 X C40
2025-07-11 19:38:00 C 13 19 24.76 +37 14 08.0 X D04
2025-07-11 19:38:59 C 13 19 24.83 +37 14 06.9 X C40
2025-07-11 19:40:41 C 13 19 24.93 +37 14 05.1 X D04
2025-07-11 19:41:12 C 13 19 24.88 +37 14 04.2 X C40
2025-07-11 19:43:25 C 13 19 24.89 +37 14 01.2 X D04
2025-07-11 19:46:06 C 13 19 25.01 +37 13 58.3 X D04
2025-07-11 19:48:50 C 13 19 25.09 +37 13 55.4 X D04
2025-07-11 19:51:31 C 13 19 25.12 +37 13 52.1 X D04
2025-07-11 19:54:14 C 13 19 25.22 +37 13 48.9 X D04
2025-07-11 19:59:39 C 13 19 25.35 +37 13 41.2 X D04
2025-07-11 20:05:04 C 13 19 25.45 +37 13 35.2 X D04
2025-07-11 21:26:53 C 13 19 27.871 +37 11 56.72 Z C23
2025-07-11 22:49:05 C 13 19 29.863 +37 10 15.64 Z C23
2025-07-12 18:58:02 C 13 20 02.14 +36 46 02.4 X C40
2025-07-12 19:00:27 C 13 20 02.20 +36 45 59.2 X C40
2025-07-12 19:02:53 C 13 20 02.27 +36 45 56.5 X C40
2025-07-12 19:05:18 C 13 20 02.35 +36 45 53.3 X C40
2025-07-12 19:07:43 C 13 20 02.39 +36 45 50.5 X C40
2025-07-12 19:10:08 C 13 20 02.45 +36 45 47.6 X C40
2025-07-12 19:12:33 C 13 20 02.49 +36 45 44.3 X C40
2025-07-12 19:14:58 C 13 20 02.56 +36 45 41.4 X C40
2025-07-12 19:17:17 C 13 20 02.62 +36 45 38.7 X C40
2025-07-12 19:19:30 C 13 20 02.69 +36 45 36.1 X C40
2025-07-12 19:21:42 C 13 20 02.73 +36 45 33.1 X 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)