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
2022-04-24 20:03:40 C 11 42 15.40 +70 16 18.0 V C40
2022-04-24 20:04:01 C 11 42 15.41 +70 16 17.4 V C40
2022-04-24 20:04:24 C 11 42 15.42 +70 16 16.8 V C40
2022-04-24 20:05:05 C 11 42 15.42 +70 16 15.6 V C40
2022-04-24 20:06:10 C 11 42 15.44 +70 16 13.7 V C40
2022-04-24 20:06:31 C 11 42 15.44 +70 16 13.1 V C40
2022-04-24 20:06:51 C 11 42 15.43 +70 16 12.5 V C40
2022-04-24 20:07:12 C 11 42 15.44 +70 16 12.0 V C40
2022-04-24 20:07:34 C 11 42 15.45 +70 16 11.3 V C40
2022-04-24 20:07:54 C 11 42 15.45 +70 16 10.7 V C40
2022-04-24 20:08:15 C 11 42 15.46 +70 16 10.1 V C40
2022-04-24 20:08:38 C 11 42 15.45 +70 16 09.4 V C40
2022-04-24 20:08:58 C 11 42 15.48 +70 16 08.8 V C40
2022-04-24 20:09:42 C 11 42 15.47 +70 16 07.6 V C40
2022-04-24 20:11:05 C 11 42 15.49 +70 16 05.2 V C40
2022-04-24 20:11:28 C 11 42 15.49 +70 16 04.6 V C40
2022-04-24 20:15:19 C 11 42 15.54 +70 15 57.8 V C40
2022-04-24 20:16:22 C 11 42 15.54 +70 15 56.0 V C40
2022-04-24 20:16:43 C 11 42 15.53 +70 15 55.4 V C40
2022-04-24 20:17:05 C 11 42 15.55 +70 15 54.8 V C40
2022-04-24 20:17:26 C 11 42 15.57 +70 15 54.2 V C40
2022-04-24 20:17:46 C 11 42 15.57 +70 15 53.6 V C40
2022-04-24 20:18:09 C 11 42 15.55 +70 15 52.9 V C40
2022-04-24 20:18:29 C 11 42 15.57 +70 15 52.4 V C40
2022-04-24 20:18:50 C 11 42 15.59 +70 15 51.7 V C40
2022-04-24 20:19:53 C 11 42 15.58 +70 15 49.9 V C40
2022-04-24 20:20:15 C 11 42 15.61 +70 15 49.3 V C40
2022-04-24 20:20:36 C 11 42 15.59 +70 15 48.7 V C40
2022-04-24 20:20:57 C 11 42 15.59 +70 15 48.0 V C40
2022-04-24 20:21:19 C 11 42 15.61 +70 15 47.5 V C40
2022-04-24 20:21:40 C 11 42 15.60 +70 15 46.8 V C40
2022-04-24 20:22:00 C 11 42 15.61 +70 15 46.3 V C40
2022-04-24 20:22:22 C 11 42 15.62 +70 15 45.6 V C40
2022-04-24 20:23:47 C 11 42 15.63 +70 15 43.2 V C40
2022-04-24 20:24:50 C 11 42 15.63 +70 15 41.3 V C40
2022-04-24 20:25:10 C 11 42 15.65 +70 15 40.7 V C40
2022-04-24 20:25:33 C 11 42 15.66 +70 15 40.0 V C40
2022-04-24 20:26:51 C 11 42 15.66 +70 15 37.9 V C40
2022-04-24 20:27:55 C 11 42 15.69 +70 15 35.9 V C40
2022-04-24 20:28:15 C 11 42 15.70 +70 15 35.4 V C40
2022-04-24 20:28:37 C 11 42 15.68 +70 15 34.8 V C40
2022-04-24 20:28:58 C 11 42 15.71 +70 15 34.2 V C40
2022-04-24 20:29:18 C 11 42 15.68 +70 15 33.5 V C40
2022-04-24 20:29:40 C 11 42 15.72 +70 15 32.9 V C40
2022-04-24 20:30:02 C 11 42 15.71 +70 15 32.2 V C40
2022-04-24 20:30:44 C 11 42 15.70 +70 15 31.0 V C40
2022-04-24 20:31:05 C 11 42 15.72 +70 15 30.4 V C40
2022-04-24 20:31:48 C 11 42 15.73 +70 15 29.2 V C40
2022-04-24 20:32:09 C 11 42 15.72 +70 15 28.5 V C40
2022-04-24 20:32:29 C 11 42 15.73 +70 15 27.9 V 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)