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
2025-04-08 17:47:52 C 17 16 56.87 +60 34 51.0 O40
2025-04-08 18:44:26 C 17 16 43.23 +60 36 25.9 O40
2025-04-09 11:04:36 C 17 12 51.642 +61 02 18.06 V 703
2025-04-09 11:08:04 C 17 12 50.785 +61 02 23.32 V 703
2025-04-09 11:11:31 C 17 12 49.907 +61 02 28.93 V 703
2025-04-09 11:14:58 C 17 12 48.906 +61 02 34.98 V 703
2025-04-10 11:10:30 C 17 07 05.030 +61 38 26.34 V 703
2025-04-10 11:13:55 C 17 07 04.184 +61 38 31.27 V 703
2025-04-10 11:17:21 C 17 07 03.299 +61 38 36.35 V 703
2025-04-10 11:20:47 C 17 07 02.428 +61 38 41.24 V 703
2025-04-10 22:50:20 C 17 04 16.241 +61 54 50.33 Z C23
2025-04-10 23:10:13 C 17 04 11.309 +61 55 19.02 Z C23
2025-04-10 23:24:19 C 17 04 07.855 +61 55 39.50 Z C23
2025-04-11 11:14:27 C 17 01 10.535 +62 12 13.86 V 703
2025-04-11 11:17:54 C 17 01 09.829 +62 12 19.01 V 703
2025-04-11 11:21:22 C 17 01 08.706 +62 12 23.04 V 703
2025-04-11 11:24:49 C 17 01 07.817 +62 12 27.72 V 703
2025-04-11 21:58:30 B 16 58 32.086 +62 26 16.26 Z K35
2025-04-11 21:59:30 B 16 58 31.855 +62 26 17.59 Z K35
2025-04-11 22:00:33 B 16 58 31.606 +62 26 18.92 Z K35
2025-04-11 22:01:35 B 16 58 31.315 +62 26 20.18 Z K35
2025-04-11 22:02:35 B 16 58 31.049 +62 26 21.91 Z K35
2025-04-11 22:03:38 B 16 58 30.746 +62 26 23.32 Z K35
2025-04-11 23:51:58 B 16 58 04.385 +62 28 50.66 W J51
2025-04-12 00:21:31 B 16 57 56.825 +62 29 31.56 W J51
2025-04-12 00:29:31 B 16 57 54.778 +62 29 42.58 W J51
2025-04-12 13:05:23 C 16 54 41.784 +62 46 02.17 V T08
2025-04-12 13:09:23 C 16 54 40.721 +62 46 07.25 V T08
2025-04-12 13:13:22 C 16 54 39.662 +62 46 12.25 V T08
2025-04-12 13:20:52 C 16 54 37.651 +62 46 21.83 V T08
2025-04-12 21:56:07 B 16 52 27.773 +62 56 37.97 V L65
2025-04-12 22:04:22 B 16 52 25.627 +62 56 48.48 V L65
2025-04-12 22:12:37 B 16 52 23.494 +62 56 58.99 V L65
2025-04-13 21:40:30 B 16 46 19.913 +63 24 29.92 Z K35
2025-04-13 21:41:30 B 16 46 19.651 +63 24 31.18 Z K35
2025-04-13 21:43:32 B 16 46 19.106 +63 24 33.55 Z K35
2025-04-14 12:32:00 C 16 42 24.998 +63 41 09.35 V T05
2025-04-14 12:34:49 C 16 42 24.209 +63 41 12.55 V T05
2025-04-14 12:38:57 C 16 42 23.050 +63 41 16.84 V T05
2025-04-14 12:47:41 C 16 42 20.638 +63 41 26.48 V T05
2025-04-14 20:21:27 C 16 40 22.200 +63 49 00.19 Z C23
2025-04-14 20:49:49 C 16 40 14.659 +63 49 31.19 Z C23
2025-04-14 21:24:19 C 16 40 05.544 +63 50 09.02 Z C23
2025-04-16 13:28:49 C 16 29 17.935 +64 28 56.10 V T08
2025-04-16 13:32:52 C 16 29 16.776 +64 28 59.59 V T08
2025-04-16 13:41:01 C 16 29 14.455 +64 29 06.68 V T08
2025-04-16 14:31:44 C 16 28 59.976 +64 29 50.42 V T08
2025-04-16 18:59:02 C 16 27 51.401 +64 33 25.45 W M01
2025-04-16 19:00:20 C 16 27 51.082 +64 33 26.90 W M01
2025-04-16 19:01:32 C 16 27 50.712 +64 33 27.78 W M01
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)