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
2025-06-13 22:25:30 C 13 10 17.65 +50 16 15.1 V D48
2025-06-13 22:26:59 C 13 10 17.32 +50 16 10.4 X D04
2025-06-13 22:31:19 C 13 10 17.33 +50 16 05.8 X D04
2025-06-13 22:35:39 C 13 10 17.30 +50 16 01.0 X D04
2025-06-14 06:39:29 C 13 10 14.171 +50 06 56.20 V 703
2025-06-14 06:42:47 C 13 10 14.131 +50 06 52.34 V 703
2025-06-14 06:46:06 C 13 10 14.113 +50 06 48.46 V 703
2025-06-14 06:49:24 C 13 10 14.070 +50 06 44.64 V 703
2025-06-14 20:25:04 C 13 10 09.81 +49 51 14.9 X D04
2025-06-14 20:29:57 C 13 10 09.78 +49 51 08.9 X D04
2025-06-14 20:34:49 C 13 10 09.71 +49 51 03.5 X D04
2025-06-14 20:39:32 C 13 10 09.73 +49 50 58.3 X C40
2025-06-14 20:39:42 C 13 10 09.75 +49 50 57.8 X D04
2025-06-14 20:41:44 C 13 10 09.71 +49 50 55.7 X C40
2025-06-14 20:43:56 C 13 10 09.68 +49 50 53.1 X C40
2025-06-14 20:44:18 C 13 10 09.66 +49 50 52.1 X D04
2025-06-14 20:46:09 C 13 10 09.67 +49 50 50.4 X C40
2025-06-14 20:48:22 C 13 10 09.65 +49 50 48.0 X C40
2025-06-14 20:48:39 C 13 10 09.70 +49 50 47.1 X D04
2025-06-14 20:50:35 C 13 10 09.64 +49 50 45.4 X C40
2025-06-14 20:52:48 C 13 10 09.63 +49 50 42.8 X C40
2025-06-14 20:52:59 C 13 10 09.62 +49 50 42.2 X D04
2025-06-14 20:55:01 C 13 10 09.61 +49 50 40.2 X C40
2025-06-14 20:57:09 C 13 10 09.59 +49 50 37.7 X C40
2025-06-14 20:57:19 C 13 10 09.54 +49 50 37.5 X D04
2025-06-14 20:59:10 C 13 10 09.56 +49 50 35.3 X C40
2025-06-14 21:01:11 C 13 10 09.56 +49 50 32.9 X C40
2025-06-14 21:01:39 C 13 10 09.49 +49 50 32.6 X D04
2025-06-14 21:03:14 C 13 10 09.56 +49 50 30.6 X C40
2025-06-14 21:05:59 C 13 10 09.49 +49 50 27.1 X D04
2025-06-14 21:10:18 C 13 10 09.51 +49 50 21.9 X D04
2025-06-14 21:14:38 C 13 10 09.45 +49 50 17.3 X D04
2025-06-14 22:07:11 C 13 10 09.24 +49 49 17.3 Z L04
2025-06-14 22:14:53 C 13 10 09.19 +49 49 08.3 Z L04
2025-06-14 22:22:35 C 13 10 09.14 +49 48 59.2 Z L04
2025-06-15 07:40:48 C 13 10 07.001 +49 38 32.46 V T08
2025-06-15 07:45:26 C 13 10 06.950 +49 38 27.17 V T08
2025-06-15 07:54:04 C 13 10 06.881 +49 38 17.12 V T08
2025-06-15 08:08:47 C 13 10 06.744 +49 38 00.10 V T08
2025-06-15 21:52:56 C 13 10 04.106 +49 22 13.04 Z C23
2025-06-15 22:54:18 C 13 10 03.816 +49 21 01.73 Z C23
2025-06-15 23:44:34 C 13 10 03.552 +49 20 03.01 Z C23
2025-06-16 21:16:05 B 13 10 01.781 +48 55 36.48 q J51
2025-06-16 21:23:02 B 13 10 01.738 +48 55 28.49 q J51
2025-06-16 21:29:07 B 13 10 01.692 +48 55 21.32 q J51
2025-06-16 21:46:29 C 13 10 01.438 +48 54 55.01 Z C23
2025-06-16 22:30:52 C 13 10 01.236 +48 54 03.85 Z C23
2025-06-16 23:51:52 C 13 10 01.061 +48 52 28.99 Z C23
2025-06-16 23:54:36 C 13 10 00.962 +48 52 32.20 V R17
2025-06-17 00:28:34 C 13 10 00.833 +48 51 52.27 V R17
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)