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
2016-05-23 02:56:03 C 10 06 27.41 +43 28 41.8 q H45
2016-05-23 02:57:08 C 10 06 27.59 +43 28 41.2 q H45
2016-05-23 02:58:25 C 10 06 27.81 +43 28 40.1 q H45
2016-05-23 21:52:24 C 10 09 43.29 +43 15 35.0 q 006
2016-05-23 21:57:04 C 10 09 44.18 +43 15 32.0 q 006
2016-05-27 05:58:10 C 10 22 56.33 +42 18 23.0 L T05
2016-05-27 05:59:34 C 10 22 56.55 +42 18 21.0 L T05
2016-05-27 06:03:03 C 10 22 57.07 +42 18 19.1 L T05
2016-05-27 06:22:58 C 10 23 00.21 +42 18 03.7 L T05
2016-05-27 21:52:31 C 10 25 27.00 +42 06 32.8 q 006
2016-05-27 21:57:28 C 10 25 27.71 +42 06 29.2 q 006
2016-05-27 22:03:08 C 10 25 28.65 +42 06 24.9 q 006
2016-05-27 22:10:29 C 10 25 29.80 +42 06 18.8 q 006
2016-05-27 22:17:30 C 10 25 30.83 +42 06 13.3 q 006
2016-05-29 02:12:05 C 10 29 51.06 +41 45 28.0 q H45
2016-05-29 02:13:38 C 10 29 51.28 +41 45 27.0 q H45
2016-05-29 02:14:51 C 10 29 51.47 +41 45 25.9 q H45
2016-05-29 02:16:06 C 10 29 51.65 +41 45 24.9 q H45
2016-05-29 02:17:30 C 10 29 51.87 +41 45 23.9 q H45
2016-05-29 02:18:38 C 10 29 52.04 +41 45 23.1 q H45
2016-05-29 21:57:30 C 10 32 51.26 +41 30 30.3 q 006
2016-05-29 22:02:45 C 10 32 52.02 +41 30 25.9 q 006
2016-05-29 22:07:32 C 10 32 52.76 +41 30 22.2 q 006
2016-05-29 22:12:04 C 10 32 53.37 +41 30 18.8 q 006
2016-05-29 22:17:05 C 10 32 54.15 +41 30 14.8 q 006
2016-05-31 04:56:47 C 10 37 28.39 +41 06 52.3 q 703
2016-05-31 05:05:15 C 10 37 29.73 +41 06 44.8 q 703
2016-05-31 05:22:13 C 10 37 32.11 +41 06 32.2 q 703
2016-06-06 03:17:26 C 10 57 22.32 +39 14 36.5 q H45
2016-06-06 03:18:35 C 10 57 22.48 +39 14 35.6 q H45
2016-06-06 03:21:50 C 10 57 22.91 +39 14 33.0 q H45
2016-06-06 03:23:09 C 10 57 23.08 +39 14 31.9 q H45
2016-06-06 03:24:33 C 10 57 23.26 +39 14 30.7 q H45
2016-06-06 03:25:55 C 10 57 23.44 +39 14 29.6 q H45
2016-06-06 20:34:07 C 10 59 39.30 +39 00 36.6 L04
2016-06-06 20:39:33 C 10 59 40.00 +39 00 32.1 L04
2016-06-06 20:44:07 C 10 59 40.59 +39 00 28.3 L04
2016-06-07 21:41:04 C 11 02 55.70 +38 40 14.0 q 006
2016-06-07 21:47:03 C 11 02 56.48 +38 40 09.7 q 006
2016-06-07 21:53:24 C 11 02 57.24 +38 40 04.6 q 006
2016-06-07 21:59:44 C 11 02 58.10 +38 39 59.1 q 006
2016-06-09 02:41:09 C 11 06 38.72 +38 16 35.1 q H45
2016-06-09 02:42:12 C 11 06 38.84 +38 16 34.3 q H45
2016-06-09 02:43:47 C 11 06 39.05 +38 16 33.0 q H45
2016-06-09 02:45:08 C 11 06 39.21 +38 16 31.9 q H45
2016-06-09 02:46:35 C 11 06 39.39 +38 16 30.6 q H45
2016-06-09 02:47:56 C 11 06 39.57 +38 16 29.6 q H45
2016-06-09 05:08:19 C 11 06 57.22 +38 14 33.9 q 703
2016-06-09 05:16:58 C 11 06 58.31 +38 14 26.7 q 703
2016-06-09 05:25:37 C 11 06 59.39 +38 14 19.7 q 703
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)