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
1999-05-01 19:29:28 C 10 17 25.33 +61 31 30.2 z 151
1999-05-01 19:39:17 C 10 17 27.19 +61 31 17.3 z 151
1999-05-01 19:43:52 C 10 17 27.97 +61 31 11.1 z 151
1999-05-01 19:47:28 C 10 17 28.64 +61 31 06.8 z 151
1999-05-01 19:49:47 C 10 17 29.08 +61 31 03.7 z 151
1999-05-01 19:53:02 C 10 17 29.63 +61 30 59.4 z 151
1999-05-02 02:58:19 C 10 18 50.38 +61 21 54.0 i 726
1999-05-02 03:03:19 C 10 18 51.36 +61 21 47.4 i 726
1999-05-02 03:08:20 C 10 18 52.12 +61 21 42.0 i 726
1999-05-02 03:13:20 C 10 18 53.12 +61 21 34.8 i 726
1999-05-02 03:18:19 C 10 18 54.04 +61 21 28.3 i 726
1999-05-02 03:23:19 C 10 18 54.95 +61 21 20.5 i 726
1999-05-02 19:26:10 C 10 21 53.89 +61 00 50.7 z 108
1999-05-02 19:28:39 C 10 21 54.35 +61 00 46.5 z 108
1999-05-02 19:31:20 C 10 21 54.58 +61 00 43.5 z 108
1999-05-02 19:34:50 C 10 21 55.60 +61 00 39.2 z 108
1999-05-02 19:40:34 C 10 21 56.44 +61 00 33.0 z 151
1999-05-02 19:45:53 C 10 21 57.37 +61 00 25.1 z 151
1999-05-02 19:50:57 C 10 21 58.25 +61 00 18.5 z 151
1999-05-02 19:55:36 C 10 21 59.06 +61 00 12.8 z 151
1999-05-02 20:00:09 C 10 21 59.86 +61 00 06.7 z 151
1999-05-02 20:03:40 C 10 22 00.49 +61 00 02.2 z 151
1999-05-02 22:06:44 C 10 22 22.33 +60 57 21.7 c 636
1999-05-02 22:09:54 C 10 22 22.91 +60 57 17.4 c 636
1999-05-02 22:55:19 C 10 22 30.95 +60 56 18.1 c 636
1999-05-02 22:59:30 C 10 22 31.70 +60 56 12.7 c 636
1999-05-03 21:24:47 C 10 26 29.78 +60 27 43.7 557
1999-05-03 22:27:09 C 10 26 40.45 +60 26 23.2 c 636
1999-05-03 22:31:09 C 10 26 40.96 +60 26 17.5 557
1999-05-03 22:33:44 C 10 26 41.54 +60 26 14.7 c 636
1999-05-03 22:37:44 C 10 26 42.23 +60 26 09.7 c 636
1999-05-03 22:41:00 C 10 26 42.77 +60 26 05.4 c 636
1999-05-03 23:40:31 C 10 26 52.73 +60 24 46.8 557
1999-05-04 00:43:44 C 10 27 03.56 +60 23 24.1 557
1999-05-04 19:36:31 C 10 30 15.96 +59 59 41.8 z 151
1999-05-04 19:42:48 C 10 30 16.91 +59 59 34.1 z 151
1999-05-04 19:46:23 C 10 30 17.51 +59 59 29.8 z 151
1999-05-04 19:48:46 C 10 30 17.85 +59 59 26.5 z 151
1999-05-04 19:53:49 C 10 30 18.60 +59 59 20.1 z 151
1999-05-04 19:56:17 C 10 30 19.07 +59 59 17.0 z 151
1999-05-05 19:47:21 C 10 34 10.66 +59 29 17.6 557
1999-05-05 20:57:21 C 10 34 21.36 +59 27 48.5 557
1999-05-05 22:01:37 C 10 34 31.21 +59 26 26.5 557
1999-05-05 23:11:38 C 10 34 42.03 +59 24 56.1 557
1999-05-06 00:24:51 C 10 34 53.43 +59 23 22.0 557
1999-05-06 19:37:10 C 10 37 52.50 +58 59 33.5 z 151
1999-05-06 19:42:19 C 10 37 53.23 +58 59 27.5 z 151
1999-05-06 19:45:58 C 10 37 53.82 +58 59 22.8 z 151
1999-05-06 19:48:05 C 10 37 54.15 +58 59 19.9 z 151
1999-05-06 19:52:30 C 10 37 54.79 +58 59 13.6 z 151
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)