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
2019-08-12 06:43:49 C 13 47 07.74 +16 27 29.8 V T05
2019-08-12 06:53:11 C 13 47 08.49 +16 27 19.7 V T05
2019-08-12 07:20:57 C 13 47 10.67 +16 26 49.2 V T05
2019-08-16 21:08:02 C 13 55 50.72 +14 26 44.1 o Z22
2019-08-16 21:53:03 C 13 55 54.19 +14 25 53.3 o Z22
2019-08-17 21:08:52 C 13 57 44.51 +14 00 04.3 o Z22
2019-08-17 21:11:00 C 13 57 44.70 +14 00 02.1 o Z22
2019-08-17 21:13:13 C 13 57 44.88 +13 59 59.6 o Z22
2019-08-17 21:54:51 C 13 57 48.08 +13 59 13.5 o Z22
2019-08-17 21:59:47 C 13 57 48.48 +13 59 07.7 o Z22
2019-08-17 22:02:02 C 13 57 48.64 +13 59 05.3 o Z22
2019-08-18 05:54:20 C 13 58 26.03 +13 50 21.1 V T08
2019-08-18 06:00:18 C 13 58 26.49 +13 50 14.6 V T08
2019-08-18 06:08:17 C 13 58 27.12 +13 50 05.5 V T08
2019-08-18 06:24:56 C 13 58 28.41 +13 49 46.8 V T08
2019-08-26 06:16:02 C 14 13 36.87 +10 10 34.9 V T08
2019-08-26 06:22:40 C 14 13 37.40 +10 10 27.0 V T08
2019-08-26 06:30:09 C 14 13 37.95 +10 10 18.3 V T08
2019-09-04 05:45:36 C 14 30 26.61 +05 48 33.8 V T05
2019-09-04 05:56:20 C 14 30 27.42 +05 48 20.1 V T05
2019-09-04 06:00:57 C 14 30 27.78 +05 48 14.4 V T05
2019-09-04 06:18:31 C 14 30 29.12 +05 47 51.9 V T05
2019-09-18 05:07:18 C 14 54 45.02 -01 49 24.8 V T08
2019-09-18 05:13:23 C 14 54 45.42 -01 49 33.7 V T08
2019-09-18 05:24:47 C 14 54 46.14 -01 49 50.6 V T08
2019-12-27 15:07:55 C 15 12 04.54 -11 05 13.1 V T08
2019-12-27 15:13:57 C 15 12 05.31 -11 05 11.0 V T08
2019-12-27 15:23:26 C 15 12 06.53 -11 05 07.7 V T08
2019-12-27 15:39:29 C 15 12 08.60 -11 05 02.1 V T08
2019-12-29 15:36:25 C 15 18 22.38 -10 48 28.2 V T05
2019-12-29 15:40:46 C 15 18 22.95 -10 48 26.4 V T05
2019-12-29 15:48:54 C 15 18 23.95 -10 48 23.5 V T05
2019-12-29 15:52:59 C 15 18 24.50 -10 48 22.2 V T05
2019-12-31 05:38:38 C 15 23 17.29 -10 35 19.6 q K74
2019-12-31 05:42:56 C 15 23 17.82 -10 35 17.9 q K74
2019-12-31 05:46:30 C 15 23 18.28 -10 35 16.8 q K74
2020-01-07 13:02:01 C 15 45 41.26 -09 33 14.4 V 703
2020-01-07 13:09:19 C 15 45 42.21 -09 33 12.1 V 703
2020-01-07 13:16:33 C 15 45 43.11 -09 33 09.6 V 703
2020-01-07 13:23:50 C 15 45 44.05 -09 33 07.0 V 703
2020-01-18 04:33:31 C 16 17 31.36 -07 55 39.4 o Z22
2020-01-18 04:46:25 C 16 17 32.94 -07 55 34.1 o Z22
2020-01-19 06:44:28 C 16 20 43.81 -07 45 00.2 o Z22
2020-01-19 06:57:19 C 16 20 45.38 -07 44 54.9 o Z22
2020-01-19 12:31:54 C 16 21 26.41 -07 42 37.6 o 691
2020-01-19 12:38:23 C 16 21 27.19 -07 42 34.9 o 691
2020-01-19 12:44:50 C 16 21 27.97 -07 42 32.2 o 691
2020-01-20 14:57:54 C 16 24 40.25 -07 31 39.3 V T08
2020-01-20 15:02:44 C 16 24 40.84 -07 31 37.2 V T08
2020-01-20 15:17:08 C 16 24 42.57 -07 31 31.5 V T08
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)