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
2023-05-21 14:41:44 C 23 42 09.053 +23 07 08.69 V T05
2023-05-21 14:46:32 C 23 42 10.255 +23 07 10.52 V T05
2023-05-29 14:23:26 C 00 33 29.714 +24 01 57.58 V T05
2023-05-29 14:32:11 C 00 33 32.165 +24 01 58.80 V T05
2023-05-29 14:51:02 C 00 33 37.442 +24 02 01.75 V T05
2023-05-31 14:07:07 C 00 47 05.974 +24 06 33.88 V T05
2023-05-31 14:11:26 C 00 47 07.224 +24 06 34.27 V T05
2023-05-31 14:25:51 C 00 47 11.359 +24 06 35.35 V T05
2023-05-31 14:42:08 C 00 47 16.018 +24 06 36.43 V T05
2025-03-08 15:15:47 C 19 17 35.018 +20 01 17.90 V T05
2025-03-08 15:19:51 C 19 17 34.426 +20 01 38.86 V T05
2025-03-08 15:20:31 C 19 17 34.339 +20 01 41.70 V T05
2025-03-08 15:29:26 C 19 17 33.053 +20 02 26.41 V T05
2025-03-09 02:32:28 C 19 16 02.597 +20 56 52.62 Z C23
2025-03-09 03:07:23 C 19 15 57.730 +20 59 46.61 Z C23
2025-03-09 03:31:11 C 19 15 54.396 +21 01 45.30 Z C23
2025-03-09 15:09:51 C 19 14 20.174 +21 59 16.66 V T08
2025-03-09 15:17:49 C 19 14 19.042 +21 59 55.93 V T08
2025-03-09 15:34:16 C 19 14 16.687 +22 01 16.97 V T08
2025-03-09 15:40:54 C 19 14 15.737 +22 01 49.73 V T08
2025-03-14 13:44:05 C 18 58 32.935 +31 07 59.81 V T05
2025-03-14 13:54:11 C 18 58 31.546 +31 08 44.27 V T05
2025-03-14 15:06:57 C 18 58 21.391 +31 14 05.68 V T08
2025-03-14 15:19:28 C 18 58 19.625 +31 15 00.68 V T08
2025-03-16 00:24:35 C 18 53 56.606 +33 35 27.67 Z C23
2025-03-16 00:27:30 C 18 53 56.182 +33 35 39.59 Z C23
2025-03-17 14:08:32 C 18 48 54.648 +36 09 58.64 V T08
2025-03-17 14:12:36 C 18 48 54.065 +36 10 15.20 V T08
2025-03-17 14:38:31 C 18 48 50.383 +36 12 00.11 V T08
2025-03-17 14:45:57 C 18 48 49.313 +36 12 30.13 V T08
2025-03-17 15:08:37 C 18 48 46.073 +36 14 00.92 V T05
2025-03-17 15:14:56 C 18 48 45.170 +36 14 26.38 V T05
2025-03-17 15:22:38 C 18 48 44.064 +36 14 57.44 V T05
2025-03-17 15:34:16 C 18 48 42.386 +36 15 44.35 V T05
2025-03-19 21:56:48 B 18 41 19.59 +39 44 22.2 X L99
2025-03-19 21:59:42 B 18 41 19.15 +39 44 33.5 X L99
2025-03-19 22:02:35 B 18 41 18.76 +39 44 44.2 X L99
2025-03-19 22:05:59 B 18 41 18.30 +39 44 56.1 X L99
2025-03-19 22:07:54 B 18 41 18.02 +39 45 04.5 X L99
2025-03-20 23:42:03 C 18 37 45.17 +41 18 25.2 V M32
2025-03-20 23:44:17 C 18 37 44.86 +41 18 33.4 V M32
2025-03-20 23:46:05 C 18 37 44.59 +41 18 40.0 V M32
2025-03-20 23:47:53 C 18 37 44.36 +41 18 46.5 V M32
2025-03-20 23:49:41 C 18 37 44.08 +41 18 53.0 V M32
2025-03-20 23:51:28 C 18 37 43.84 +41 18 59.6 V M32
2025-03-20 23:53:15 C 18 37 43.58 +41 19 06.1 V M32
2025-03-20 23:55:03 C 18 37 43.34 +41 19 12.6 V M32
2025-03-21 13:28:51 C 18 35 49.195 +42 07 41.74 V T05
2025-03-21 13:30:56 C 18 35 48.890 +42 07 49.19 V T05
2025-03-21 13:33:00 C 18 35 48.576 +42 07 56.57 V T05
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)