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
1999-04-23 01:27:31 C 09 24 53.39 +66 01 57.7 557
1999-04-23 02:23:54 C 09 25 11.99 +66 00 44.1 557
1999-04-23 04:56:53 C 09 26 02.61 +65 57 50.0 658
1999-04-23 04:59:50 C 09 26 03.64 +65 57 45.8 658
1999-04-23 05:03:46 C 09 26 04.93 +65 57 40.9 658
1999-04-24 01:00:21 C 09 32 19.52 +65 32 12.6 557
1999-04-24 01:13:18 C 09 32 23.50 +65 31 55.5 557
1999-04-24 02:16:41 C 09 32 43.01 +65 30 31.7 557
1999-04-24 02:26:45 C 09 32 46.11 +65 30 18.4 557
1999-04-24 21:15:00 C 09 38 20.89 +65 06 31.4 a 130
1999-04-24 21:24:59 C 09 38 23.75 +65 06 18.4 a 130
1999-04-24 21:35:59 C 09 38 26.74 +65 06 03.8 a 130
1999-04-24 21:47:03 C 09 38 29.93 +65 05 48.7 a 130
1999-04-25 02:34:28 C 09 39 52.40 +64 59 41.3 z 835
1999-04-25 02:45:43 C 09 39 55.57 +64 59 26.6 z 835
1999-04-25 03:00:12 C 09 39 59.53 +64 59 07.2 z 835
1999-04-25 19:22:16 C 09 44 33.62 +64 38 04.2 z 104
1999-04-25 19:24:41 C 09 44 34.24 +64 38 00.6 z 104
1999-04-25 19:27:20 C 09 44 34.93 +64 37 57.1 z 104
1999-04-25 19:30:00 C 09 44 35.61 +64 37 53.4 z 104
1999-04-25 20:35:56 C 09 44 53.05 +64 36 26.4 z 151
1999-04-25 20:40:11 C 09 44 54.14 +64 36 20.8 z 151
1999-04-25 20:44:26 C 09 44 55.24 +64 36 15.3 z 151
1999-04-25 20:49:20 C 09 44 56.56 +64 36 08.8 z 151
1999-04-25 20:52:41 C 09 44 57.43 +64 36 04.5 z 151
1999-04-25 20:54:41 C 09 44 57.95 +64 36 01.7 z 151
1999-04-26 02:30:57 C 09 46 28.88 +64 28 48.5 i 726
1999-04-26 02:35:57 C 09 46 30.21 +64 28 42.2 i 726
1999-04-26 02:40:56 C 09 46 31.51 +64 28 35.3 i 726
1999-04-26 02:45:56 C 09 46 32.77 +64 28 29.1 i 726
1999-04-26 02:48:52 C 09 46 33.55 +64 28 25.2 i 726
1999-04-26 02:53:52 C 09 46 34.85 +64 28 18.5 i 726
1999-04-26 02:59:08 C 09 46 36.20 +64 28 11.4 i 726
1999-04-26 03:03:53 C 09 46 37.38 +64 28 05.3 i 726
1999-04-26 03:08:53 C 09 46 38.66 +64 27 59.1 i 726
1999-04-26 03:13:52 C 09 46 40.01 +64 27 51.5 i 726
1999-04-26 20:21:33 C 09 51 07.27 +64 05 39.1 557
1999-04-26 21:20:36 C 09 51 21.91 +64 04 21.0 557
1999-04-26 22:02:22 C 09 51 32.26 +64 03 25.3 557
1999-04-26 23:30:55 C 09 51 54.31 +64 01 26.9 557
1999-04-27 12:16:09 C 09 55 05.13 +63 45 04.8 z 900
1999-04-27 12:29:25 C 09 55 08.29 +63 44 47.0 z 900
1999-04-28 19:42:23 C 10 02 28.94 +63 04 13.1 z 151
1999-04-28 19:48:38 C 10 02 30.26 +63 04 05.1 z 151
1999-04-28 19:52:41 C 10 02 31.17 +63 03 59.8 z 151
1999-04-28 19:56:35 C 10 02 32.07 +63 03 54.4 z 151
1999-04-28 20:08:09 C 10 02 34.50 +63 03 39.4 z 151
1999-04-28 20:18:02 C 10 02 36.69 +63 03 26.7 z 151
1999-04-28 20:56:06 C 10 02 44.97 +63 02 35.4 d 046
1999-04-28 20:57:27 C 10 02 45.26 +63 02 33.7 d 046
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)