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
2025-06-05 20:18:56 C 13 13 30.09 +53 54 26.5 X C40
2025-06-05 20:21:09 C 13 13 30.01 +53 54 24.1 X C40
2025-06-05 20:23:21 C 13 13 29.95 +53 54 21.5 X C40
2025-06-05 20:25:34 C 13 13 29.88 +53 54 19.1 X C40
2025-06-05 20:25:41 B 13 13 29.89 +53 54 18.5 X L76
2025-06-05 20:27:42 C 13 13 29.84 +53 54 16.7 X C40
2025-06-05 20:29:44 C 13 13 29.75 +53 54 14.3 X C40
2025-06-05 20:31:46 C 13 13 29.64 +53 54 12.6 X C40
2025-06-05 20:33:48 C 13 13 29.64 +53 54 09.8 X C40
2025-06-05 20:35:56 B 13 13 29.56 +53 54 07.0 X L76
2025-06-05 20:46:12 B 13 13 29.25 +53 53 55.4 X L76
2025-06-06 08:09:01 C 13 13 10.592 +53 41 16.87 V 703
2025-06-06 08:12:01 C 13 13 10.477 +53 41 13.20 V 703
2025-06-06 08:15:01 C 13 13 10.430 +53 41 09.96 V 703
2025-06-06 08:18:02 C 13 13 10.333 +53 41 06.32 V 703
2025-06-06 19:21:16 C 13 12 54.30 +53 28 51.1 X C40
2025-06-06 19:23:28 C 13 12 54.25 +53 28 48.7 X C40
2025-06-06 19:25:41 C 13 12 54.18 +53 28 46.2 X C40
2025-06-06 19:27:54 C 13 12 54.12 +53 28 43.7 X C40
2025-06-06 19:30:07 C 13 12 54.05 +53 28 41.2 X C40
2025-06-06 19:32:20 C 13 12 53.99 +53 28 38.7 X C40
2025-06-06 19:34:33 C 13 12 53.94 +53 28 36.2 X C40
2025-06-06 19:36:46 C 13 12 53.86 +53 28 33.6 X C40
2025-06-06 19:38:54 C 13 12 53.81 +53 28 31.2 X C40
2025-06-06 19:40:56 C 13 12 53.74 +53 28 28.9 X C40
2025-06-06 19:42:58 C 13 12 53.68 +53 28 26.7 X C40
2025-06-06 19:45:00 C 13 12 53.62 +53 28 24.3 X C40
2025-06-06 22:41:35 C 13 12 49.421 +53 25 12.14 V R17
2025-06-06 22:43:50 C 13 12 49.358 +53 25 09.52 V R17
2025-06-06 23:01:21 C 13 12 48.840 +53 24 49.75 V R17
2025-06-06 23:03:56 C 13 12 48.754 +53 24 46.76 V R17
2025-06-06 23:21:05 C 13 12 48.259 +53 24 27.32 V R17
2025-06-06 23:24:15 C 13 12 48.149 +53 24 23.69 V R17
2025-06-06 23:41:02 C 13 12 47.671 +53 24 04.75 V R17
2025-06-06 23:44:23 C 13 12 47.563 +53 24 00.72 V R17
2025-06-07 07:58:07 C 13 12 36.223 +53 14 53.45 V T08
2025-06-07 08:02:45 C 13 12 36.086 +53 14 48.26 V T08
2025-06-07 08:11:29 C 13 12 35.827 +53 14 38.29 V T08
2025-06-07 08:28:07 C 13 12 35.359 +53 14 19.39 V T08
2025-06-07 19:36:50 C 13 12 20.47 +53 01 47.2 Z S93
2025-06-07 19:39:54 C 13 12 20.39 +53 01 43.8 Z S93
2025-06-07 19:42:57 C 13 12 20.31 +53 01 40.3 Z S93
2025-06-07 20:30:44 C 13 12 19.10 +53 00 45.8 Z S93
2025-06-07 20:33:48 C 13 12 19.02 +53 00 42.3 Z S93
2025-06-07 20:36:50 C 13 12 18.94 +53 00 38.7 Z S93
2025-06-07 21:29:34 C 13 12 17.77 +52 59 38.5 X D04
2025-06-07 21:38:30 C 13 12 17.56 +52 59 28.1 X D04
2025-06-07 21:42:50 C 13 12 17.49 +52 59 23.6 X D04
2025-06-07 21:47:10 C 13 12 17.34 +52 59 18.0 X D04
2025-06-07 21:51:30 C 13 12 17.28 +52 59 12.7 X D04
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)