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
2020-01-20 15:25:44 C 16 24 43.62 -07 31 27.8 V T08
2020-01-24 13:00:20 C 16 36 04.90 -06 51 27.9 V 703
2020-01-24 13:04:16 C 16 36 05.37 -06 51 25.9 V 703
2020-01-24 13:08:11 C 16 36 05.83 -06 51 24.6 V 703
2020-01-24 13:12:07 C 16 36 06.35 -06 51 21.6 V 703
2020-01-28 14:55:49 C 16 47 50.57 -06 07 19.9 V T08
2020-01-28 15:00:29 C 16 47 51.12 -06 07 17.6 V T08
2020-01-28 15:24:15 C 16 47 53.92 -06 07 06.9 V T08
2020-01-30 14:20:31 C 16 53 29.53 -05 45 06.6 V T05
2020-01-30 14:24:31 C 16 53 30.00 -05 45 04.8 V T05
2020-01-30 14:31:55 C 16 53 30.88 -05 45 01.0 V T05
2020-01-30 14:46:29 C 16 53 32.61 -05 44 54.5 V T05
2020-02-03 15:59:14 C 17 05 02.35 -04 57 30.0 V T05
2020-02-03 16:03:14 C 17 05 02.80 -04 57 28.0 V T05
2020-02-03 16:05:12 C 17 05 03.04 -04 57 27.0 V T05
2020-02-03 16:09:09 C 17 05 03.50 -04 57 25.1 V T05
2020-02-05 14:37:32 C 17 10 31.09 -04 33 51.2 V T08
2020-02-05 14:42:51 C 17 10 31.71 -04 33 48.4 V T08
2020-02-05 14:50:48 C 17 10 32.63 -04 33 44.4 V T08
2020-02-05 15:05:32 C 17 10 34.34 -04 33 36.9 V T08
2020-02-08 05:50:52 C 17 17 54.34 -04 00 52.2 q G40
2020-02-08 06:10:54 C 17 17 56.66 -04 00 41.4 q G40
2020-02-08 06:31:07 C 17 17 58.98 -04 00 30.7 q G40
2020-02-09 15:34:58 C 17 21 49.93 -03 42 47.3 V T08
2020-02-09 15:39:00 C 17 21 50.37 -03 42 45.4 V T08
2020-02-09 15:44:38 C 17 21 51.02 -03 42 42.2 V T08
2020-02-23 15:27:28 C 18 00 24.78 -00 24 51.5 V T05
2020-02-23 15:33:27 C 18 00 25.46 -00 24 47.7 V T05
2020-02-23 15:42:05 C 18 00 26.42 -00 24 42.3 V T05
2020-02-23 15:49:30 C 18 00 27.24 -00 24 37.5 V T05
2020-03-19 04:29:08 C 19 07 04.07 +06 43 50.6 V 160
2020-03-19 04:32:01 C 19 07 04.39 +06 43 52.9 V 160
2020-03-19 04:34:55 C 19 07 04.71 +06 43 54.9 V 160
2020-03-20 03:27:15 C 19 09 41.58 +07 02 38.4 V 160
2020-03-20 03:30:12 C 19 09 41.90 +07 02 40.8 V 160
2020-03-20 03:33:09 C 19 09 42.25 +07 02 43.1 V 160
2020-03-24 03:55:16 C 19 20 46.21 +08 23 11.3 V 160
2020-03-24 03:57:53 C 19 20 46.56 +08 23 13.9 V 160
2020-03-24 04:00:23 C 19 20 46.87 +08 23 15.6 V 160
2020-04-04 03:11:04 C 19 51 46.31 +12 15 50.7 V 160
2020-04-04 03:13:43 C 19 51 46.61 +12 15 52.3 V 160
2020-04-04 03:16:22 C 19 51 46.90 +12 15 54.1 V 160
2020-04-04 13:58:07 C 19 53 04.71 +12 25 47.8 V T05
2020-04-04 14:02:49 C 19 53 05.28 +12 25 52.0 V T05
2020-04-04 14:10:50 C 19 53 06.23 +12 25 59.4 V T05
2020-04-04 14:24:47 C 19 53 07.89 +12 26 12.3 V T05
2020-04-09 12:45:08 C 20 07 40.97 +14 16 31.3 V T08
2020-04-09 12:49:49 C 20 07 41.55 +14 16 36.0 V T08
2020-04-09 13:15:44 C 20 07 44.76 +14 17 00.6 V T08
2020-04-11 04:02:13 C 20 12 37.16 +14 53 46.8 V 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)