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
2025-07-27 18:06:35 C 13 30 05.37 +29 19 32.4 X C40
2025-07-27 18:09:00 C 13 30 05.42 +29 19 29.3 X C40
2025-07-27 18:11:24 C 13 30 05.49 +29 19 25.8 X C40
2025-07-27 18:13:49 C 13 30 05.55 +29 19 22.9 X C40
2025-07-27 18:16:13 C 13 30 05.58 +29 19 19.5 X C40
2025-07-27 18:18:38 C 13 30 05.67 +29 19 16.5 X C40
2025-07-27 18:21:02 C 13 30 05.77 +29 19 13.3 X C40
2025-07-27 18:23:27 C 13 30 05.77 +29 19 10.2 X C40
2025-07-27 18:25:45 C 13 30 05.85 +29 19 07.0 X C40
2025-07-27 18:27:58 C 13 30 05.90 +29 19 04.2 X C40
2025-07-27 18:30:10 C 13 30 05.96 +29 19 01.3 X C40
2025-07-27 18:32:23 C 13 30 06.02 +29 18 58.4 X C40
2025-07-28 18:18:50 C 13 30 44.69 +28 48 13.1 X C40
2025-07-28 18:21:15 C 13 30 44.80 +28 48 09.8 X C40
2025-07-28 18:23:40 C 13 30 44.81 +28 48 06.7 X C40
2025-07-28 18:26:05 C 13 30 44.89 +28 48 03.5 X C40
2025-07-28 18:28:30 C 13 30 44.97 +28 48 00.6 X C40
2025-07-28 18:30:55 C 13 30 45.01 +28 47 57.1 X C40
2025-07-28 18:33:20 C 13 30 45.07 +28 47 53.8 X C40
2025-07-28 18:35:45 C 13 30 45.13 +28 47 50.7 X C40
2025-07-28 18:38:02 C 13 30 45.21 +28 47 47.7 X C40
2025-07-28 18:40:15 C 13 30 45.26 +28 47 44.8 X C40
2025-07-28 18:42:27 C 13 30 45.32 +28 47 42.0 X C40
2025-07-28 18:44:40 C 13 30 45.35 +28 47 38.9 X C40
2025-07-28 20:40:06 C 13 30 48.559 +28 45 09.58 Z C23
2025-07-28 21:38:19 C 13 30 50.059 +28 43 52.93 Z C23
2025-07-29 18:59:26 C 13 31 24.06 +28 16 05.1 X C40
2025-07-29 19:04:16 C 13 31 24.15 +28 15 57.7 X C40
2025-07-29 19:06:40 C 13 31 24.24 +28 15 55.4 X C40
2025-07-29 19:08:57 C 13 31 24.27 +28 15 52.2 X C40
2025-07-29 19:11:09 C 13 31 24.37 +28 15 49.1 X C40
2025-07-29 19:13:34 C 13 31 24.39 +28 15 45.5 X C40
2025-07-29 19:18:16 C 13 31 24.50 +28 15 39.4 X C40
2025-07-29 19:20:35 C 13 31 24.54 +28 15 36.7 X C40
2025-07-29 19:22:48 C 13 31 24.65 +28 15 34.1 X C40
2025-07-30 18:03:01 C 13 32 00.21 +27 45 52.4 X C40
2025-07-30 18:05:26 C 13 32 00.25 +27 45 49.5 X C40
2025-07-30 18:07:51 C 13 32 00.28 +27 45 46.4 X C40
2025-07-30 18:10:16 C 13 32 00.35 +27 45 42.4 X C40
2025-07-30 18:12:40 C 13 32 00.42 +27 45 39.6 X C40
2025-07-30 18:19:36 C 13 32 00.55 +27 45 30.4 X C40
2025-07-30 18:26:26 C 13 32 00.74 +27 45 21.2 X C40
2025-07-30 21:05:33 C 13 32 04.867 +27 41 56.44 V R17
2025-07-30 21:25:46 C 13 32 05.323 +27 41 29.47 V R17
2025-07-30 21:32:29 C 13 32 05.611 +27 41 15.29 Z C23
2025-07-30 21:46:11 C 13 32 05.798 +27 41 02.26 V R17
2025-07-30 21:55:22 C 13 32 06.132 +27 40 45.01 Z C23
2025-07-30 22:06:31 C 13 32 06.283 +27 40 35.15 V R17
2025-07-31 06:02:40 C 13 32 18.593 +27 30 11.02 V T08
2025-07-31 06:03:59 C 13 32 18.634 +27 30 09.40 V T08
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)