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
2022-05-11 21:28:01 C 11 54 02.66 +60 09 26.7 V C40
2022-05-11 21:28:11 C 11 54 02.67 +60 09 26.4 V C40
2022-05-11 21:28:56 C 11 54 02.70 +60 09 25.4 V C40
2022-05-11 21:29:42 C 11 54 02.73 +60 09 24.3 V C40
2022-05-11 21:30:15 C 11 54 02.74 +60 09 23.6 V C40
2022-05-11 21:30:25 C 11 54 02.73 +60 09 23.4 V C40
2022-05-11 21:30:48 C 11 54 02.76 +60 09 22.9 V C40
2022-05-11 21:31:00 C 11 54 02.75 +60 09 22.7 V C40
2022-05-11 21:31:11 C 11 54 02.77 +60 09 22.4 V C40
2022-05-11 21:31:33 C 11 54 02.77 +60 09 21.9 V C40
2022-05-11 21:31:56 C 11 54 02.79 +60 09 21.3 V C40
2022-05-11 21:33:14 C 11 54 02.84 +60 09 19.5 V C40
2022-05-11 21:33:25 C 11 54 02.84 +60 09 19.4 V C40
2022-05-11 21:33:35 C 11 54 02.85 +60 09 19.0 V C40
2022-05-11 21:33:59 C 11 54 02.86 +60 09 18.5 V C40
2022-05-11 21:34:31 C 11 54 02.88 +60 09 17.8 V C40
2022-05-11 21:34:54 C 11 54 02.88 +60 09 17.3 V C40
2022-05-11 21:35:05 C 11 54 02.90 +60 09 17.0 V C40
2022-05-11 21:35:28 C 11 54 02.90 +60 09 16.6 V C40
2022-05-11 21:35:39 C 11 54 02.91 +60 09 16.4 V C40
2022-05-11 21:38:19 C 11 54 02.99 +60 09 12.8 V C40
2022-05-11 21:38:31 C 11 54 03.00 +60 09 12.5 V C40
2022-05-11 21:42:03 C 11 54 03.10 +60 09 07.7 V C40
2022-05-11 21:44:40 C 11 54 03.18 +60 09 04.2 V C40
2022-05-11 21:45:25 C 11 54 03.20 +60 09 03.2 V C40
2022-05-11 21:45:48 C 11 54 03.22 +60 09 02.6 V C40
2022-05-11 21:46:31 C 11 54 03.23 +60 09 01.6 V C40
2022-05-11 21:46:54 C 11 54 03.25 +60 09 01.2 V C40
2022-05-11 21:48:56 C 11 54 03.31 +60 08 58.4 V C40
2022-05-11 21:56:07 C 11 54 03.53 +60 08 48.7 V C40
2022-05-11 21:56:30 C 11 54 03.55 +60 08 48.1 V C40
2022-05-11 21:57:36 C 11 54 03.60 +60 08 46.7 V C40
2022-05-11 21:58:00 C 11 54 03.59 +60 08 46.1 V C40
2022-05-11 22:00:47 C 11 54 03.69 +60 08 42.5 V C40
2022-05-11 22:01:11 C 11 54 03.71 +60 08 41.9 V C40
2022-05-11 22:01:22 C 11 54 03.70 +60 08 41.7 V C40
2022-05-11 22:02:07 C 11 54 03.74 +60 08 40.6 V C40
2022-05-11 22:02:28 C 11 54 03.75 +60 08 40.1 V C40
2022-05-11 22:03:01 C 11 54 03.76 +60 08 39.4 V C40
2022-05-11 22:06:34 C 11 54 03.86 +60 08 34.6 V C40
2022-05-11 22:06:44 C 11 54 03.88 +60 08 34.3 V C40
2022-05-12 21:15:24 C 11 54 53.44 +59 38 23.9 V 130
2022-05-12 21:16:59 C 11 54 53.49 +59 38 22.5 q M16
2022-05-12 21:18:16 C 11 54 53.51 +59 38 20.1 V 130
2022-05-12 21:21:08 C 11 54 53.61 +59 38 16.3 V 130
2022-05-12 21:24:42 C 11 54 53.71 +59 38 11.7 V 130
2022-05-12 21:39:13 C 11 54 54.12 +59 37 53.1 q M16
2022-05-12 22:01:27 C 11 54 54.80 +59 37 23.7 q M16
2022-05-12 22:52:41 C 11 54 56.54 +59 36 14.6 V C23
2022-05-12 22:58:04 C 11 54 56.71 +59 36 07.5 V C23
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)