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
2025-06-09 21:19:03 C 13 11 23.82 +52 06 01.5 X D04
2025-06-09 21:22:11 C 13 11 23.67 +52 05 57.3 X D04
2025-06-09 21:25:19 C 13 11 23.64 +52 05 54.2 X D04
2025-06-09 21:28:26 C 13 11 23.53 +52 05 50.3 X D04
2025-06-09 21:37:49 C 13 11 23.48 +52 05 40.0 X D04
2025-06-09 21:40:56 C 13 11 23.34 +52 05 36.5 X D04
2025-06-09 21:47:11 C 13 11 23.24 +52 05 29.6 X D04
2025-06-09 22:46:01 C 13 11 22.699 +52 04 30.40 V R17
2025-06-09 23:06:55 C 13 11 22.265 +52 04 06.49 V R17
2025-06-09 23:27:22 C 13 11 21.830 +52 03 43.02 V R17
2025-06-09 23:48:02 C 13 11 21.408 +52 03 19.33 V R17
2025-06-10 18:31:03 B 13 11 04.690 +51 42 16.38 W M73
2025-06-10 18:38:56 B 13 11 04.550 +51 42 07.34 W M73
2025-06-10 18:46:16 B 13 11 04.404 +51 41 58.78 W M73
2025-06-10 19:59:09 C 13 11 03.81 +51 40 32.9 Z L04
2025-06-10 20:04:47 C 13 11 03.71 +51 40 26.2 Z L04
2025-06-10 20:10:14 C 13 11 03.61 +51 40 19.9 Z L04
2025-06-10 20:45:04 B 13 11 03.718 +51 39 46.12 q J51
2025-06-10 20:54:42 B 13 11 02.63 +51 39 27.6 X L76
2025-06-10 20:55:14 B 13 11 03.458 +51 39 34.45 q J51
2025-06-10 21:00:52 B 13 11 02.53 +51 39 20.7 X L76
2025-06-10 21:05:23 B 13 11 03.257 +51 39 23.15 q J51
2025-06-10 21:07:00 B 13 11 02.44 +51 39 13.6 X L76
2025-06-10 21:13:10 B 13 11 02.35 +51 39 06.2 X L76
2025-06-10 21:19:18 B 13 11 02.25 +51 38 59.3 X L76
2025-06-10 21:35:47 C 13 11 02.450 +51 38 43.33 Z C23
2025-06-10 22:14:07 C 13 11 01.781 +51 37 58.33 Z C23
2025-06-11 07:48:00 C 13 10 54.310 +51 27 19.12 V T08
2025-06-11 07:53:57 C 13 10 54.158 +51 27 12.46 V T08
2025-06-11 08:01:57 C 13 10 54.029 +51 27 03.13 V T08
2025-06-11 08:18:50 C 13 10 53.736 +51 26 43.33 V T08
2025-06-11 19:53:51 C 13 10 45.30 +51 13 31.7 X D04
2025-06-11 19:56:58 C 13 10 45.29 +51 13 28.6 X D04
2025-06-11 20:00:05 C 13 10 45.34 +51 13 24.8 X D04
2025-06-11 20:18:50 C 13 10 45.02 +51 13 03.8 X D04
2025-06-11 20:33:42 C 13 10 44.80 +51 12 46.7 X C40
2025-06-11 20:36:28 C 13 10 44.77 +51 12 43.5 X C40
2025-06-11 20:39:14 C 13 10 44.72 +51 12 40.2 X C40
2025-06-11 20:42:00 C 13 10 44.68 +51 12 37.1 X C40
2025-06-11 20:44:46 C 13 10 44.64 +51 12 33.9 X C40
2025-06-11 20:47:32 C 13 10 44.60 +51 12 30.6 X C40
2025-06-11 20:50:18 C 13 10 44.58 +51 12 27.4 X C40
2025-06-11 20:53:04 C 13 10 44.52 +51 12 24.3 X C40
2025-06-11 20:55:50 C 13 10 44.48 +51 12 21.0 X C40
2025-06-11 20:58:37 C 13 10 44.44 +51 12 17.8 X C40
2025-06-11 21:01:23 C 13 10 44.42 +51 12 14.6 X C40
2025-06-11 21:04:09 C 13 10 44.36 +51 12 11.3 X C40
2025-06-11 21:06:40 B 13 10 44.38 +51 12 08.3 X L76
2025-06-11 21:10:20 B 13 10 44.32 +51 12 03.9 X L76
2025-06-11 21:13:28 B 13 10 44.28 +51 12 00.0 X L76
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)