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
2025-07-07 23:12:05 C 13 17 03.46 +39 04 45.7 X Z03
2025-07-08 18:21:42 C 13 17 32.05 +38 41 56.9 X C40
2025-07-08 18:24:07 C 13 17 32.12 +38 41 53.8 X C40
2025-07-08 18:26:30 C 13 17 32.15 +38 41 50.7 X C40
2025-07-08 18:28:55 C 13 17 32.20 +38 41 48.0 X C40
2025-07-08 18:31:20 C 13 17 32.26 +38 41 45.2 X C40
2025-07-08 18:33:45 C 13 17 32.31 +38 41 41.9 X C40
2025-07-08 18:36:10 C 13 17 32.39 +38 41 39.1 X C40
2025-07-08 18:38:34 C 13 17 32.44 +38 41 36.1 X C40
2025-07-08 18:40:53 C 13 17 32.48 +38 41 33.2 X C40
2025-07-08 18:43:05 C 13 17 32.54 +38 41 30.5 X C40
2025-07-08 18:45:19 C 13 17 32.59 +38 41 28.1 X C40
2025-07-08 18:47:32 C 13 17 32.63 +38 41 25.5 X C40
2025-07-08 21:10:24 C 13 17 36.278 +38 38 34.22 Z C23
2025-07-08 22:05:45 C 13 17 37.579 +38 37 26.90 Z C23
2025-07-08 22:15:37 C 13 17 37.71 +38 37 16.9 X Z03
2025-07-08 22:45:34 C 13 17 38.41 +38 36 40.5 X Z03
2025-07-08 23:14:34 C 13 17 39.10 +38 36 05.2 X Z03
2025-07-09 06:31:55 C 13 17 50.330 +38 27 30.67 V T08
2025-07-09 06:38:38 C 13 17 50.482 +38 27 22.43 V T08
2025-07-09 06:47:24 C 13 17 50.666 +38 27 11.81 V T08
2025-07-09 07:06:05 C 13 17 51.074 +38 26 49.24 V T08
2025-07-09 07:45:57 C 13 17 51.958 +38 26 00.60 V T05
2025-07-09 07:50:32 C 13 17 52.058 +38 25 54.80 V T05
2025-07-09 08:08:27 C 13 17 52.466 +38 25 32.99 V T05
2025-07-09 08:17:47 C 13 17 52.690 +38 25 21.65 V T05
2025-07-09 19:12:26 C 13 18 09.45 +38 12 14.7 X D04
2025-07-09 19:21:26 C 13 18 09.72 +38 12 02.9 X D04
2025-07-09 19:34:56 C 13 18 09.96 +38 11 46.6 X D04
2025-07-09 19:43:44 C 13 18 10.22 +38 11 36.5 X D04
2025-07-09 19:56:07 C 13 18 10.49 +38 11 20.8 X D04
2025-07-09 21:19:12 C 13 18 12.56 +38 09 40.6 X C40
2025-07-09 21:21:37 C 13 18 12.63 +38 09 36.3 X C40
2025-07-09 21:28:53 C 13 18 12.83 +38 09 28.0 X C40
2025-07-09 21:31:18 C 13 18 12.86 +38 09 24.5 X C40
2025-07-09 21:33:42 C 13 18 12.90 +38 09 22.0 X C40
2025-07-09 21:36:08 C 13 18 12.96 +38 09 19.2 X C40
2025-07-09 21:38:26 C 13 18 12.99 +38 09 17.1 X C40
2025-07-09 23:03:26 B 13 18 15.57 +38 07 50.5 X X76
2025-07-09 23:09:06 B 13 18 15.68 +38 07 43.7 X X76
2025-07-09 23:14:06 B 13 18 15.72 +38 07 37.1 X X76
2025-07-10 19:34:32 C 13 18 47.00 +37 43 02.4 X C40
2025-07-10 19:36:57 C 13 18 47.06 +37 42 59.1 X C40
2025-07-10 19:39:22 C 13 18 47.14 +37 42 56.3 X C40
2025-07-10 19:41:46 C 13 18 47.18 +37 42 53.4 X C40
2025-07-10 19:44:11 C 13 18 47.24 +37 42 50.4 X C40
2025-07-10 19:46:35 C 13 18 47.31 +37 42 47.4 X C40
2025-07-10 19:48:59 C 13 18 47.38 +37 42 44.3 X C40
2025-07-10 19:51:23 C 13 18 47.44 +37 42 41.7 X C40
2025-07-10 19:53:43 C 13 18 47.49 +37 42 38.7 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)