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
2001-05-29 20:22:14 C 07 01 46.49 +22 51 19.0 587
2001-05-29 20:25:15 C 07 01 47.40 +22 51 21.3 587
2001-05-29 20:28:14 C 07 01 48.15 +22 51 21.3 587
2001-05-29 20:31:10 C 07 01 48.95 +22 51 23.1 587
2001-05-29 20:34:29 C 07 01 49.79 +22 51 25.2 587
2001-08-20 19:54:58 C 12 45 23.89 +12 01 21.9 i 587
2001-08-20 20:00:29 C 12 45 24.45 +12 01 18.7 i 587
2001-09-12 18:41:15 C 13 49 29.51 +05 50 31.1 c 104
2001-09-12 18:43:52 C 13 49 29.79 +05 50 29.6 c 104
2001-09-12 18:46:31 C 13 49 30.14 +05 50 28.2 c 104
2001-09-12 18:47:42 C 13 49 30.22 +05 50 27.2 c 104
2001-09-12 18:49:09 C 13 49 30.46 +05 50 26.1 c 104
2001-09-12 18:50:22 C 13 49 30.56 +05 50 25.5 c 104
2001-09-12 18:51:40 C 13 49 30.69 +05 50 25.0 c 104
2001-09-12 18:53:02 C 13 49 30.80 +05 50 23.5 c 104
2001-09-12 18:54:19 C 13 49 30.99 +05 50 23.8 c 104
2002-03-11 12:48:00 C 21 23 04.47 +31 00 05.7 c 926
2002-03-11 12:49:01 C 21 23 04.27 +31 00 13.5 c 926
2002-03-11 12:49:58 C 21 23 04.14 +31 00 19.8 c 926
2002-03-11 12:51:00 C 21 23 03.92 +31 00 28.5 c 926
2002-03-15 02:12:08 C 21 03 38.17 +41 44 32.9 c 084
2002-03-16 02:34:50 C 20 57 28.86 +44 35 39.8 c 084
2002-03-17 02:38:03 C 20 51 05.97 +47 17 20.8 c 084
2002-03-20 22:15:57 C 20 23 28.26 +56 21 15.1 c 587
2002-03-20 22:17:35 C 20 23 27.73 +56 21 24.5 c 587
2002-03-20 22:19:11 C 20 23 27.20 +56 21 32.5 c 587
2002-03-20 22:20:49 C 20 23 26.66 +56 21 41.5 c 587
2002-03-20 22:22:27 C 20 23 26.14 +56 21 49.7 c 587
2002-03-25 01:12:57 C 19 46 06.32 +63 58 25.5 c 084
2002-03-26 22:34:18 C 19 25 42.43 +66 44 00.9 c 198
2002-03-26 22:42:42 C 19 25 38.48 +66 44 30.0 c 198
2002-03-26 22:49:09 C 19 25 35.51 +66 44 52.1 c 198
2002-03-26 22:55:33 C 19 25 32.49 +66 45 14.3 c 198
2002-03-26 23:03:34 C 19 25 28.75 +66 45 41.8 c 198
2002-03-27 12:15:31 C 19 19 04.71 +67 29 38.1 c 926
2002-03-27 12:16:51 C 19 19 04.30 +67 29 43.2 c 926
2002-03-27 12:19:41 C 19 19 02.64 +67 29 51.1 c 926
2002-03-27 23:04:49 C 19 13 42.94 +68 02 52.1 c 945
2002-03-27 23:08:24 C 19 13 41.24 +68 03 03.3 c 945
2002-03-27 23:10:58 C 19 13 39.89 +68 03 11.4 c 945
2002-03-28 00:28:56 C 19 13 01.02 +68 07 22.3 c 198
2002-03-28 00:35:17 C 19 12 57.79 +68 07 42.2 c 198
2002-03-28 00:38:30 C 19 12 56.18 +68 07 52.2 c 198
2002-03-29 20:40:38 C 18 49 31.78 +70 10 10.0 c 195
2002-03-29 20:54:34 C 18 49 24.19 +70 10 46.1 c 195
2002-03-29 21:08:29 C 18 49 16.63 +70 11 22.3 c 195
2002-03-29 23:04:24 C 18 48 12.55 +70 16 20.8 c 628
2002-03-29 23:10:08 C 18 48 09.33 +70 16 34.8 c 628
2002-03-29 23:15:55 C 18 48 06.14 +70 16 49.7 c 628
2002-03-29 23:21:40 C 18 48 02.84 +70 17 05.8 c 628
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)