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
2025-07-23 18:14:00 C 13 27 24.82 +31 21 49.3 X C40
2025-07-23 18:16:26 C 13 27 24.91 +31 21 46.3 X C40
2025-07-23 18:18:51 C 13 27 24.98 +31 21 43.0 X C40
2025-07-23 18:21:15 C 13 27 25.03 +31 21 40.3 X C40
2025-07-23 18:23:34 C 13 27 25.09 +31 21 37.1 X C40
2025-07-23 18:25:45 C 13 27 25.13 +31 21 34.3 X C40
2025-07-23 18:27:58 C 13 27 25.22 +31 21 31.6 X C40
2025-07-23 18:30:11 C 13 27 25.26 +31 21 28.8 X C40
2025-07-24 18:25:04 C 13 28 05.81 +30 51 13.5 X C40
2025-07-24 18:27:28 C 13 28 05.88 +30 51 10.4 X C40
2025-07-24 18:29:54 C 13 28 05.95 +30 51 07.4 X C40
2025-07-24 18:32:19 C 13 28 05.99 +30 51 04.1 X C40
2025-07-24 18:34:44 C 13 28 06.08 +30 51 01.0 X C40
2025-07-24 18:37:09 C 13 28 06.13 +30 50 57.9 X C40
2025-07-24 18:39:34 C 13 28 06.18 +30 50 54.9 X C40
2025-07-24 18:41:59 C 13 28 06.27 +30 50 51.7 X C40
2025-07-24 18:44:17 C 13 28 06.33 +30 50 48.8 X C40
2025-07-24 18:46:30 C 13 28 06.38 +30 50 45.9 X C40
2025-07-24 18:48:43 C 13 28 06.43 +30 50 43.1 X C40
2025-07-24 18:50:56 C 13 28 06.50 +30 50 40.1 X C40
2025-07-24 21:16:53 C 13 28 10.639 +30 47 39.52 V R17
2025-07-24 21:37:16 C 13 28 11.158 +30 47 13.31 V R17
2025-07-24 21:57:38 C 13 28 11.681 +30 46 47.17 V R17
2025-07-24 22:18:00 C 13 28 12.211 +30 46 20.82 V R17
2025-07-25 18:11:12 C 13 28 45.87 +30 21 00.0 X C40
2025-07-25 18:13:36 C 13 28 45.92 +30 20 56.8 X C40
2025-07-25 18:16:01 C 13 28 45.99 +30 20 53.8 X C40
2025-07-25 18:18:25 C 13 28 46.05 +30 20 50.6 X C40
2025-07-25 18:20:50 C 13 28 46.13 +30 20 47.5 X C40
2025-07-25 18:23:15 C 13 28 46.19 +30 20 44.3 X C40
2025-07-25 18:25:39 C 13 28 46.24 +30 20 41.2 X C40
2025-07-25 18:28:04 C 13 28 46.30 +30 20 38.2 X C40
2025-07-25 18:30:23 C 13 28 46.38 +30 20 35.0 X C40
2025-07-25 18:32:36 C 13 28 46.42 +30 20 32.3 X C40
2025-07-25 18:34:49 C 13 28 46.49 +30 20 29.5 X C40
2025-07-25 18:37:02 C 13 28 46.54 +30 20 26.5 X C40
2025-07-25 20:57:21 C 13 28 50.561 +30 17 26.70 Z C23
2025-07-25 22:39:45 C 13 28 53.292 +30 15 14.08 Z C23
2025-07-26 18:00:29 C 13 29 25.63 +29 50 31.8 X C40
2025-07-26 18:02:53 C 13 29 25.69 +29 50 28.9 X C40
2025-07-26 18:05:18 C 13 29 25.76 +29 50 25.8 X C40
2025-07-26 18:07:43 C 13 29 25.82 +29 50 22.5 X C40
2025-07-26 18:10:08 C 13 29 25.88 +29 50 19.6 X C40
2025-07-26 18:12:32 C 13 29 25.94 +29 50 16.4 X C40
2025-07-26 18:14:56 C 13 29 26.00 +29 50 13.3 X C40
2025-07-26 18:17:21 C 13 29 26.08 +29 50 10.1 X C40
2025-07-26 18:19:39 C 13 29 26.13 +29 50 07.3 X C40
2025-07-26 18:21:52 C 13 29 26.22 +29 50 04.5 X C40
2025-07-26 18:24:04 C 13 29 26.24 +29 50 01.4 X C40
2025-07-26 18:26:16 C 13 29 26.32 +29 49 58.6 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)