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
2016-08-03 02:15:24 C 13 19 26.19 +18 49 33.6 q H45
2016-08-03 02:16:51 C 13 19 26.32 +18 49 32.5 q H45
2016-08-03 02:18:28 C 13 19 26.47 +18 49 30.6 q H45
2016-08-03 02:20:04 C 13 19 26.60 +18 49 29.5 q H45
2016-08-03 02:22:05 C 13 19 26.78 +18 49 27.6 q H45
2016-08-03 02:23:26 C 13 19 26.90 +18 49 26.0 q H45
2017-01-27 05:13:22 C 16 35 27.72 -07 21 36.7 q K74
2017-01-27 05:46:07 C 16 35 31.46 -07 21 16.0 q K74
2017-02-15 05:23:17 C 17 26 44.45 -02 12 53.9 q 160
2017-02-15 05:25:30 C 17 26 44.71 -02 12 52.6 q 160
2017-02-15 05:27:57 C 17 26 45.03 -02 12 51.1 q 160
2017-03-02 10:50:35 C 18 05 51.57 +02 35 24.1 R G45
2017-03-02 10:57:17 C 18 05 52.26 +02 35 29.6 R G45
2017-03-02 10:57:46 C 18 05 52.31 +02 35 30.0 R G45
2017-03-02 11:04:17 C 18 05 53.07 +02 35 35.3 R G45
2017-03-02 11:04:40 C 18 05 53.09 +02 35 35.6 R G45
2017-03-02 11:11:11 C 18 05 53.70 +02 35 41.4 R G45
2017-03-02 11:25:06 C 18 05 55.14 +02 35 53.1 R G45
2017-03-02 11:25:17 C 18 05 55.15 +02 35 53.4 R G45
2017-03-09 02:47:31 C 18 22 30.47 +04 54 47.4 q 160
2017-03-09 02:49:29 C 18 22 30.66 +04 54 49.2 q 160
2017-03-09 02:51:26 C 18 22 30.85 +04 54 50.9 q 160
2017-03-11 03:10:22 C 18 27 30.09 +05 38 35.0 q 160
2017-03-11 03:11:30 C 18 27 30.08 +05 38 36.0 q 160
2017-03-11 03:12:41 C 18 27 30.17 +05 38 37.2 q 160
2017-03-15 09:38:01 C 18 38 01.67 +07 13 53.3 u H21
2017-03-15 09:39:59 C 18 38 01.85 +07 13 55.2 u H21
2017-03-15 09:41:57 C 18 38 02.05 +07 13 57.0 u H21
2017-03-15 09:43:54 C 18 38 02.26 +07 13 59.1 u H21
2017-03-15 09:45:52 C 18 38 02.46 +07 14 00.9 u H21
2017-03-15 09:47:49 C 18 38 02.65 +07 14 02.8 u H21
2017-03-15 09:49:47 C 18 38 02.84 +07 14 04.7 u H21
2017-03-15 09:51:45 C 18 38 03.09 +07 14 06.5 u H21
2017-03-15 09:53:42 C 18 38 03.28 +07 14 08.3 u H21
2017-03-15 09:55:40 C 18 38 03.49 +07 14 10.0 u H21
2017-03-15 09:57:38 C 18 38 03.69 +07 14 12.1 u H21
2017-03-15 09:59:35 C 18 38 03.87 +07 14 14.0 u H21
2017-03-15 10:01:21 C 18 38 04.05 +07 14 15.4 u H21
2017-03-17 10:55:42 C 18 43 04.49 +08 00 59.0 q H15
2017-03-17 11:09:36 C 18 43 05.95 +08 01 12.8 q H15
2017-03-17 11:23:40 C 18 43 07.32 +08 01 25.7 q H15
2017-03-28 02:36:42 C 19 09 09.85 +12 18 16.2 q 160
2017-03-28 02:38:39 C 19 09 10.06 +12 18 18.4 q 160
2017-03-28 02:40:37 C 19 09 10.26 +12 18 20.5 q 160
2017-04-04 02:20:25 C 19 26 20.95 +15 18 48.1 q 160
2017-04-04 02:22:22 C 19 26 21.17 +15 18 50.3 q 160
2017-04-04 02:24:18 C 19 26 21.34 +15 18 52.4 q 160
2017-04-08 02:00:29 C 19 36 15.79 +17 05 45.3 q 160
2017-04-08 02:02:27 C 19 36 16.02 +17 05 47.6 q 160
2017-04-08 02:04:24 C 19 36 16.23 +17 05 49.9 q 160
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)