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
2025-07-31 06:08:01 C 13 32 18.722 +27 30 04.00 V T08
2025-07-31 06:11:19 C 13 32 18.802 +27 29 59.53 V T08
2025-07-31 06:15:23 C 13 32 18.890 +27 29 54.28 V T08
2025-07-31 06:16:03 C 13 32 18.890 +27 29 53.23 V T08
2025-07-31 06:30:46 C 13 32 19.229 +27 29 33.61 V T08
2025-07-31 19:47:32 C 13 32 39.439 +27 11 54.92 W B38
2025-07-31 19:52:39 C 13 32 39.588 +27 11 48.01 W B38
2025-07-31 19:57:25 C 13 32 39.646 +27 11 41.64 W B38
2025-07-31 20:01:46 C 13 32 39.761 +27 11 35.77 W B38
2025-07-31 20:06:02 C 13 32 39.881 +27 11 29.98 W B38
2025-08-01 06:15:29 C 13 32 55.039 +26 58 07.90 V T08
2025-08-01 06:20:48 C 13 32 55.147 +26 58 00.73 V T08
2025-08-01 06:31:35 C 13 32 55.392 +26 57 46.19 V T08
2025-08-01 06:46:16 C 13 32 55.718 +26 57 26.46 V T08
2025-08-02 06:06:21 C 13 33 29.899 +26 26 20.29 V T05
2025-08-02 06:10:57 C 13 33 30.012 +26 26 13.96 V T05
2025-08-02 06:18:48 C 13 33 30.175 +26 26 03.37 V T05
2025-08-02 06:37:30 C 13 33 30.576 +26 25 38.03 V T05
2025-08-03 06:16:35 C 13 34 03.955 +25 53 52.04 V T05
2025-08-03 06:21:10 C 13 34 04.046 +25 53 45.78 V T05
2025-08-03 06:29:10 C 13 34 04.205 +25 53 34.84 V T05
2025-08-03 06:45:01 C 13 34 04.538 +25 53 12.98 V T05
2025-08-03 19:27:50 B 13 34 22.056 +25 35 57.52 V 160
2025-08-03 19:33:59 B 13 34 22.195 +25 35 49.16 V 160
2025-08-04 18:26:30 C 13 34 52.33 +25 04 42.2 X C40
2025-08-04 18:28:55 C 13 34 52.38 +25 04 38.8 X C40
2025-08-04 18:31:20 C 13 34 52.44 +25 04 35.6 X C40
2025-08-04 18:33:44 C 13 34 52.48 +25 04 32.2 X C40
2025-08-04 18:36:07 C 13 34 52.52 +25 04 29.0 X C40
2025-08-04 18:38:32 C 13 34 52.58 +25 04 25.6 X C40
2025-08-04 18:40:56 C 13 34 52.62 +25 04 22.2 X C40
2025-08-04 18:43:19 C 13 34 52.68 +25 04 18.8 X C40
2025-08-04 18:45:38 C 13 34 52.72 +25 04 15.8 X C40
2025-08-04 18:47:51 C 13 34 52.76 +25 04 12.7 X C40
2025-08-04 18:50:03 C 13 34 52.81 +25 04 09.7 X C40
2025-08-04 18:52:16 C 13 34 52.84 +25 04 06.7 X C40
2025-08-05 06:03:05 C 13 35 07.104 +24 48 56.16 V T08
2025-08-05 06:08:26 C 13 35 07.200 +24 48 48.64 V T08
2025-08-05 06:16:29 C 13 35 07.356 +24 48 37.44 V T08
2025-08-05 17:31:47 C 13 35 21.43 +24 33 04.2 X C40
2025-08-05 17:34:11 C 13 35 21.48 +24 33 01.0 X C40
2025-08-05 17:36:36 C 13 35 21.54 +24 32 57.7 X C40
2025-08-05 17:39:01 C 13 35 21.59 +24 32 54.5 X C40
2025-08-05 17:41:26 C 13 35 21.62 +24 32 51.1 X C40
2025-08-05 17:43:50 C 13 35 21.65 +24 32 47.7 X C40
2025-08-05 17:46:14 C 13 35 21.72 +24 32 44.2 X C40
2025-08-05 17:48:39 C 13 35 21.74 +24 32 41.2 X C40
2025-08-05 17:50:58 C 13 35 21.81 +24 32 37.7 X C40
2025-08-05 17:53:11 C 13 35 21.82 +24 32 34.7 X C40
2025-08-05 17:55:22 C 13 35 21.87 +24 32 31.6 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)