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
2008-05-25 06:17:45 C 16 25 35.49 +63 43 20.1 o H51
2008-05-25 06:18:18 C 16 25 35.36 +63 43 20.4 o H51
2008-05-25 06:18:53 C 16 25 35.24 +63 43 20.6 o H51
2008-05-25 06:19:26 C 16 25 35.09 +63 43 20.8 o H51
2008-05-25 06:20:01 C 16 25 34.99 +63 43 21.0 o H51
2008-05-25 06:20:35 C 16 25 34.87 +63 43 21.5 o H51
2008-05-25 06:21:09 C 16 25 34.74 +63 43 21.6 o H51
2008-05-25 06:21:43 C 16 25 34.59 +63 43 21.9 o H51
2008-05-25 06:22:18 C 16 25 34.48 +63 43 22.2 o H51
2008-05-25 06:22:52 C 16 25 34.36 +63 43 22.4 o H51
2008-05-25 06:23:26 C 16 25 34.24 +63 43 22.8 o H51
2008-05-25 06:24:00 C 16 25 34.12 +63 43 23.0 o H51
2008-05-25 06:24:34 C 16 25 33.97 +63 43 23.4 o H51
2008-05-25 06:25:09 C 16 25 33.85 +63 43 23.4 o H51
2008-05-25 06:25:43 C 16 25 33.73 +63 43 23.8 o H51
2008-05-25 06:26:17 C 16 25 33.62 +63 43 24.1 o H51
2008-05-25 06:26:51 C 16 25 33.50 +63 43 24.3 o H51
2008-05-25 06:30:26 C 16 25 32.70 +63 43 26.1 o H51
2008-05-25 06:31:01 C 16 25 32.57 +63 43 26.2 o H51
2008-05-25 06:31:35 C 16 25 32.45 +63 43 26.5 o H51
2008-05-25 06:32:09 C 16 25 32.32 +63 43 26.7 o H51
2008-05-25 06:32:43 C 16 25 32.20 +63 43 27.0 o H51
2008-05-25 06:33:17 C 16 25 32.10 +63 43 27.3 o H51
2008-05-25 06:33:51 C 16 25 31.95 +63 43 27.5 o H51
2008-05-25 06:34:26 C 16 25 31.84 +63 43 27.6 o H51
2008-05-25 06:35:00 C 16 25 31.69 +63 43 28.0 o H51
2008-05-25 06:35:34 C 16 25 31.58 +63 43 28.3 o H51
2008-05-25 06:36:08 C 16 25 31.47 +63 43 28.6 o H51
2008-05-25 06:36:42 C 16 25 31.34 +63 43 28.9 o H51
2008-05-25 06:37:16 C 16 25 31.21 +63 43 29.0 o H51
2008-05-25 06:37:50 C 16 25 31.08 +63 43 29.3 o H51
2008-05-25 06:38:24 C 16 25 30.96 +63 43 29.5 o H51
2008-05-25 06:38:58 C 16 25 30.80 +63 43 29.8 o H51
2008-05-25 06:39:32 C 16 25 30.70 +63 43 30.2 o H51
2008-05-25 06:40:06 C 16 25 30.58 +63 43 30.4 o H51
2008-05-25 06:40:39 C 16 25 30.47 +63 43 30.6 o H51
2008-05-25 06:41:13 C 16 25 30.35 +63 43 30.9 o H51
2008-05-26 01:32:12 C 16 21 32.04 +63 51 43.7 o H98
2008-05-26 02:03:13 C 16 21 25.39 +63 51 58.0 o H98
2008-05-26 02:20:29 C 16 21 21.31 +63 52 05.5 o H98
2008-05-30 22:42:39 C 15 56 01.57 +64 24 10.9 c B19
2008-05-30 22:45:28 C 15 56 00.95 +64 24 11.4 c B19
2008-05-30 22:48:17 C 15 56 00.24 +64 24 11.9 c B19
2008-06-05 05:59:15 C 15 28 13.54 +64 22 47.1 r H45
2008-06-05 06:02:58 C 15 28 12.74 +64 22 46.5 r H45
2008-06-05 06:04:08 C 15 28 12.42 +64 22 46.3 r H45
2008-06-05 06:06:57 C 15 28 11.84 +64 22 45.8 r H45
2008-06-05 06:08:24 C 15 28 11.46 +64 22 45.7 r H45
2008-06-05 21:10:57 C 15 24 59.58 +64 20 10.0 o A81
2008-06-05 21:12:39 C 15 24 59.17 +64 20 09.6 o A81
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)