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
2025-08-05 17:57:35 C 13 35 21.89 +24 32 28.5 X C40
2025-08-05 19:24:22 C 13 35 23.724 +24 30 29.63 W B38
2025-08-05 19:28:32 C 13 35 23.743 +24 30 24.19 W B38
2025-08-05 19:33:10 C 13 35 23.849 +24 30 16.96 W B38
2025-08-05 19:39:44 C 13 35 23.971 +24 30 08.03 W B38
2025-08-05 19:45:34 C 13 35 24.110 +24 30 00.36 W B38
2025-08-05 20:36:56 C 13 35 25.205 +24 28 47.75 Z C23
2025-08-05 21:43:43 C 13 35 26.503 +24 27 15.05 Z C23
2025-08-06 17:32:58 C 13 35 49.90 +23 59 52.7 X C40
2025-08-06 17:35:23 C 13 35 49.97 +23 59 48.5 X C40
2025-08-06 17:40:12 C 13 35 50.07 +23 59 42.5 X C40
2025-08-06 17:45:03 C 13 35 50.16 +23 59 35.0 X C40
2025-08-06 17:51:58 C 13 35 50.22 +23 59 25.8 X C40
2025-08-06 17:54:10 C 13 35 50.28 +23 59 22.4 X C40
2025-08-06 17:56:23 C 13 35 50.31 +23 59 19.3 X C40
2025-08-06 21:00:58 C 13 35 53.753 +23 55 06.67 V R17
2025-08-06 21:21:32 C 13 35 54.108 +23 54 37.91 V R17
2025-08-06 21:41:55 C 13 35 54.434 +23 54 09.14 V R17
2025-08-06 22:02:18 C 13 35 54.785 +23 53 40.27 V R17
2025-08-07 06:02:48 C 13 36 03.883 +23 42 33.98 V T05
2025-08-07 06:07:25 C 13 36 03.943 +23 42 27.50 V T05
2025-08-07 06:15:18 C 13 36 04.068 +23 42 16.42 V T05
2025-08-07 06:33:22 C 13 36 04.349 +23 41 50.82 V T05
2025-08-08 05:57:14 C 13 36 29.242 +23 09 03.31 V T08
2025-08-08 06:01:57 C 13 36 29.316 +23 08 56.58 V T08
2025-08-08 06:09:18 C 13 36 29.424 +23 08 46.14 V T08
2025-08-08 06:26:47 C 13 36 29.676 +23 08 21.26 V T08
2025-08-08 19:19:33 C 13 36 42.626 +22 50 04.34 W B38
2025-08-08 19:24:14 C 13 36 42.677 +22 49 57.47 W B38
2025-08-08 19:29:47 C 13 36 42.727 +22 49 49.37 W B38
2025-08-08 19:35:30 C 13 36 42.850 +22 49 41.20 W B38
2025-08-08 19:40:45 C 13 36 42.922 +22 49 33.78 W B38
2025-08-09 05:57:11 C 13 36 52.548 +22 35 04.85 V T08
2025-08-09 06:01:48 C 13 36 52.613 +22 34 58.01 V T08
2025-08-09 06:09:11 C 13 36 52.704 +22 34 47.42 V T08
2025-08-09 06:24:35 C 13 36 52.896 +22 34 25.36 V T08
2025-08-09 21:20:06 C 13 37 06.350 +22 12 59.08 Z C23
2025-08-09 21:36:20 C 13 37 06.562 +22 12 35.50 Z C23
2025-08-09 21:53:39 C 13 37 06.782 +22 12 10.01 Z C23
2025-08-10 06:00:58 C 13 37 13.541 +22 00 39.60 V T05
2025-08-10 06:05:33 C 13 37 13.579 +22 00 32.87 V T05
2025-08-10 06:29:20 C 13 37 13.826 +21 59 58.34 V T05
2025-08-10 17:32:07 C 13 37 22.82 +21 43 57.5 X C40
2025-08-10 17:34:31 C 13 37 22.80 +21 43 53.7 X C40
2025-08-10 17:36:55 C 13 37 22.83 +21 43 50.5 X C40
2025-08-10 17:39:21 C 13 37 22.91 +21 43 46.9 X C40
2025-08-10 17:41:45 C 13 37 22.88 +21 43 43.2 X C40
2025-08-10 17:44:09 C 13 37 22.91 +21 43 39.7 X C40
2025-08-10 17:46:33 C 13 37 22.95 +21 43 36.5 X C40
2025-08-10 17:48:58 C 13 37 22.98 +21 43 32.7 X C40
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)