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
2019-07-12 04:11:57 C 12 48 29.56 +29 14 44.4 U I41
2019-07-12 04:40:22 C 12 48 31.75 +29 14 15.8 U I41
2019-07-13 04:11:32 C 12 50 23.34 +28 50 55.5 U I41
2019-07-13 04:24:03 C 12 50 24.31 +28 50 42.9 U I41
2019-07-13 04:25:20 C 12 50 24.41 +28 50 41.6 U I41
2019-07-13 04:39:58 C 12 50 25.54 +28 50 26.9 U I41
2019-07-13 04:41:17 C 12 50 25.64 +28 50 25.6 U I41
2019-07-13 04:53:06 C 12 50 26.56 +28 50 13.7 U I41
2019-07-15 06:04:10 C 12 54 19.37 +28 01 21.6 V T05
2019-07-15 06:18:39 C 12 54 20.46 +28 01 06.9 V T05
2019-07-15 06:22:51 C 12 54 20.79 +28 01 02.8 V T05
2019-07-15 06:36:24 C 12 54 21.83 +28 00 49.0 V T05
2019-07-16 04:12:57 C 12 56 03.91 +27 39 14.2 U I41
2019-07-16 04:14:14 C 12 56 04.01 +27 39 13.0 U I41
2019-07-16 05:45:42 C 12 56 11.08 +27 37 40.6 U I41
2019-07-16 05:47:00 C 12 56 11.18 +27 37 39.3 U I41
2019-07-17 08:01:44 C 12 58 14.91 +27 11 29.0 V T08
2019-07-17 08:06:26 C 12 58 15.29 +27 11 24.8 V T08
2019-07-17 08:31:04 C 12 58 17.18 +27 10 59.9 V T08
2019-07-17 08:45:58 C 12 58 18.37 +27 10 44.8 V T08
2019-07-19 04:08:57 C 13 01 42.88 +26 27 18.0 U I41
2019-07-19 04:14:55 C 13 01 43.34 +26 27 12.0 U I41
2019-07-21 05:55:43 C 13 05 36.98 +25 37 19.4 V T08
2019-07-21 06:01:44 C 13 05 37.47 +25 37 13.2 V T08
2019-07-21 06:09:12 C 13 05 38.03 +25 37 05.7 V T08
2019-07-21 06:24:13 C 13 05 39.18 +25 36 50.6 V T08
2019-07-22 04:08:50 C 13 07 21.40 +25 14 52.7 U I41
2019-07-22 04:18:42 C 13 07 22.16 +25 14 42.6 U I41
2019-07-25 01:46:24 C 13 12 48.38 +24 04 22.5 V W34
2019-07-25 01:54:33 C 13 12 49.04 +24 04 14.3 V W34
2019-07-25 02:05:00 C 13 12 49.84 +24 04 03.8 V W34
2019-07-25 02:15:12 C 13 12 50.61 +24 03 53.2 V W34
2019-07-25 07:56:20 C 13 13 17.20 +23 58 08.2 V T08
2019-07-25 07:59:40 C 13 13 17.44 +23 58 04.6 V T08
2019-07-25 08:07:29 C 13 13 18.06 +23 57 56.9 V T08
2019-07-25 08:08:49 C 13 13 18.14 +23 57 55.2 V T08
2019-07-25 08:12:52 C 13 13 18.47 +23 57 51.0 V T08
2019-07-25 08:31:26 C 13 13 19.91 +23 57 32.0 V T08
2019-07-27 07:12:48 C 13 16 59.27 +23 09 56.7 V T05
2019-07-27 07:17:31 C 13 16 59.64 +23 09 51.8 V T05
2019-07-27 07:25:28 C 13 17 00.24 +23 09 43.7 V T05
2019-07-27 07:53:26 C 13 17 02.40 +23 09 14.9 V T05
2019-07-29 05:49:14 C 13 20 38.44 +22 22 11.0 V T08
2019-07-29 05:56:46 C 13 20 38.96 +22 22 03.1 V T08
2019-07-29 06:11:17 C 13 20 40.04 +22 21 48.3 V T08
2019-08-08 23:31:07 C 13 40 53.17 +17 52 42.1 o W92
2019-08-08 23:42:23 C 13 40 54.05 +17 52 30.7 o W92
2019-08-09 17:06:31 C 13 42 16.50 +17 33 55.2 o K95
2019-08-09 17:24:38 C 13 42 17.85 +17 33 35.7 o K95
2019-08-12 06:38:25 C 13 47 07.33 +16 27 35.6 V T05
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)