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
2025-05-26 07:50:31 C 13 25 11.906 +58 26 33.47 V 703
2025-05-26 08:36:52 C 13 25 09.475 +58 25 51.67 V T08
2025-05-26 08:41:29 C 13 25 09.122 +58 25 46.85 V T08
2025-05-26 08:50:09 C 13 25 08.472 +58 25 37.78 V T08
2025-05-26 09:08:46 C 13 25 07.063 +58 25 18.08 V T08
2025-05-28 07:19:06 C 13 22 10.463 +57 36 58.72 V 703
2025-05-28 07:22:33 C 13 22 10.268 +57 36 54.72 V 703
2025-05-28 07:26:00 C 13 22 10.049 +57 36 51.05 V 703
2025-05-28 07:29:26 C 13 22 09.826 +57 36 47.38 V 703
2025-05-28 08:25:31 C 13 22 07.210 +57 35 53.77 V T05
2025-05-28 08:32:52 C 13 22 06.722 +57 35 45.89 V T05
2025-05-28 08:38:09 C 13 22 06.377 +57 35 40.24 V T05
2025-05-28 08:52:41 C 13 22 05.410 +57 35 24.65 V T05
2025-05-28 22:01:18 B 13 21 20.578 +57 21 30.31 q J51
2025-05-28 22:11:28 B 13 21 19.853 +57 21 19.04 q J51
2025-05-28 22:21:36 B 13 21 19.260 +57 21 08.03 q J51
2025-05-28 22:43:21 C 13 21 17.875 +57 20 45.28 V R17
2025-05-28 23:03:44 C 13 21 16.591 +57 20 23.46 V R17
2025-05-28 23:24:06 C 13 21 15.307 +57 20 01.57 V R17
2025-05-28 23:44:28 C 13 21 14.028 +57 19 39.58 V R17
2025-05-29 22:00:26 B 13 20 01.961 +56 55 53.54 q Y84
2025-05-29 22:04:41 B 13 20 01.709 +56 55 48.79 q Y84
2025-05-29 22:08:55 B 13 20 01.488 +56 55 44.40 q Y84
2025-05-30 05:31:19 C 13 19 38.485 +56 47 54.96 V 703
2025-05-30 05:34:43 C 13 19 38.276 +56 47 51.22 V 703
2025-05-30 05:38:08 C 13 19 38.089 +56 47 47.40 V 703
2025-05-30 05:41:33 C 13 19 37.895 +56 47 43.76 V 703
2025-05-30 07:56:57 C 13 19 31.277 +56 45 22.28 V T08
2025-05-30 08:01:00 C 13 19 31.027 +56 45 17.78 V T08
2025-05-30 08:09:07 C 13 19 30.566 +56 45 08.89 V T08
2025-05-30 08:18:30 C 13 19 30.031 +56 44 58.63 V T08
2025-05-30 08:23:09 C 13 19 29.760 +56 44 53.66 V T08
2025-05-30 08:25:48 C 13 19 29.597 +56 44 50.75 V T08
2025-05-30 08:31:55 C 13 19 29.251 +56 44 44.16 V T08
2025-05-30 08:46:28 C 13 19 28.421 +56 44 28.36 V T08
2025-05-30 21:56:46 C 13 18 49.632 +56 30 12.49 Z C23
2025-05-30 22:31:41 C 13 18 47.863 +56 29 34.73 Z C23
2025-05-31 19:58:39 C 13 17 48.20 +56 06 27.1 X C40
2025-05-31 20:01:14 C 13 17 48.07 +56 06 24.3 X C40
2025-05-31 20:03:33 C 13 17 47.95 +56 06 21.8 X C40
2025-05-31 20:05:46 C 13 17 47.84 +56 06 19.4 X C40
2025-05-31 20:06:52 C 13 17 47.79 +56 06 18.1 X C40
2025-05-31 21:38:44 B 13 17 44.364 +56 04 43.61 q J51
2025-05-31 21:48:16 B 13 17 43.853 +56 04 33.49 q J51
2025-05-31 21:57:48 B 13 17 43.361 +56 04 22.94 q J51
2025-06-01 08:29:54 C 13 17 15.377 +55 52 58.66 V T05
2025-06-01 08:36:14 C 13 17 15.065 +55 52 51.64 V T05
2025-06-01 08:45:24 C 13 17 14.611 +55 52 41.48 V T05
2025-06-01 08:59:55 C 13 17 13.908 +55 52 25.50 V T05
2025-06-02 21:51:10 C 13 15 46.255 +55 12 07.60 Z 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)