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
2025-05-19 20:55:34 B 13 38 25.176 +61 00 15.66 Z K35
2025-05-19 20:56:36 B 13 38 25.061 +61 00 14.76 Z K35
2025-05-19 20:57:26 B 13 38 24.979 +61 00 13.39 V L65
2025-05-19 20:57:39 B 13 38 24.960 +61 00 14.11 Z K35
2025-05-19 22:42:50 C 13 38 13.572 +60 58 33.71 Z C23
2025-05-19 22:42:52 C 13 38 14.105 +60 58 40.15 V R17
2025-05-19 22:54:13 C 13 38 12.398 +60 58 23.09 Z C23
2025-05-19 23:03:22 C 13 38 11.825 +60 58 20.82 V R17
2025-05-19 23:23:53 C 13 38 09.542 +60 58 01.38 V R17
2025-05-19 23:44:25 C 13 38 07.267 +60 57 41.76 V R17
2025-05-20 13:20:13 C 13 36 43.330 +60 44 38.69 V T05
2025-05-20 13:25:32 C 13 36 42.794 +60 44 33.18 V T05
2025-05-20 13:36:46 C 13 36 41.681 +60 44 21.91 V T05
2025-05-20 13:52:09 C 13 36 40.128 +60 44 06.25 V T05
2025-05-21 07:14:47 C 13 34 59.970 +60 27 31.43 V 703
2025-05-21 07:18:15 C 13 34 59.628 +60 27 27.90 V 703
2025-05-21 07:21:42 C 13 34 59.264 +60 27 24.55 V 703
2025-05-21 07:25:09 C 13 34 58.926 +60 27 21.10 V 703
2025-05-22 09:08:33 C 13 32 37.639 +60 02 19.86 V T08
2025-05-22 09:13:12 C 13 32 37.186 +60 02 15.18 V T08
2025-05-22 09:22:30 C 13 32 36.288 +60 02 05.89 V T08
2025-05-22 09:41:45 C 13 32 34.421 +60 01 46.49 V T08
2025-05-22 21:06:27 B 13 31 35.417 +59 50 24.07 Z K35
2025-05-22 21:07:30 B 13 31 35.323 +59 50 23.10 Z K35
2025-05-22 21:08:30 B 13 31 35.225 +59 50 22.09 Z K35
2025-05-22 21:09:32 B 13 31 35.124 +59 50 21.08 Z K35
2025-05-22 21:10:35 B 13 31 35.042 +59 50 20.04 Z K35
2025-05-22 22:11:47 C 13 31 29.522 +59 49 19.02 Z C23
2025-05-22 22:22:12 C 13 31 28.584 +59 49 08.33 Z C23
2025-05-22 22:42:30 C 13 31 27.182 +59 48 54.40 V R17
2025-05-22 22:53:11 C 13 31 25.771 +59 48 37.55 Z C23
2025-05-22 23:03:00 C 13 31 25.272 +59 48 34.06 V R17
2025-05-22 23:23:34 C 13 31 23.354 +59 48 13.46 V R17
2025-05-22 23:44:06 C 13 31 21.444 +59 47 52.84 V R17
2025-05-23 20:44:00 B 13 29 37.301 +59 26 49.45 Z K35
2025-05-23 20:45:34 B 13 29 37.174 +59 26 47.98 Z K35
2025-05-23 20:47:06 B 13 29 37.044 +59 26 46.43 Z K35
2025-05-23 20:47:37 B 13 29 37.010 +59 26 46.00 Z K35
2025-05-23 22:25:11 B 13 29 27.98 +59 25 05.2 X L76
2025-05-23 22:30:25 B 13 29 27.55 +59 24 59.8 X L76
2025-05-23 22:35:40 B 13 29 27.11 +59 24 54.2 X L76
2025-05-23 22:40:54 B 13 29 26.67 +59 24 48.7 X L76
2025-05-23 22:46:08 B 13 29 26.24 +59 24 43.5 X L76
2025-05-23 22:47:34 C 13 29 26.08 +59 24 42.3 X C40
2025-05-23 22:49:47 C 13 29 25.88 +59 24 40.0 X C40
2025-05-23 22:51:22 B 13 29 25.77 +59 24 37.9 X L76
2025-05-23 22:52:00 C 13 29 25.71 +59 24 37.7 X C40
2025-05-23 22:54:13 C 13 29 25.52 +59 24 35.3 X C40
2025-05-23 22:56:25 C 13 29 25.35 +59 24 33.0 X C40
2025-05-23 22:58:37 C 13 29 25.17 +59 24 30.8 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)