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
2023-04-16 09:53:49 C 20 57 08.090 +13 16 06.13 V W68
2023-04-16 10:05:24 C 20 57 10.039 +13 16 16.25 V W68
2023-04-16 10:06:43 C 20 57 10.056 +13 16 15.89 V W68
2023-04-22 08:41:45 C 21 19 34.246 +15 10 20.60 V W68
2023-04-22 08:46:29 C 21 19 34.966 +15 10 24.53 V W68
2023-04-22 08:50:26 C 21 19 35.597 +15 10 27.66 V W68
2023-04-22 09:07:11 C 21 19 38.304 +15 10 41.16 V W68
2023-04-23 14:34:53 C 21 24 28.202 +15 34 03.61 V T05
2023-04-23 14:40:48 C 21 24 29.160 +15 34 08.40 V T05
2023-04-23 14:52:01 C 21 24 30.989 +15 34 17.15 V T05
2023-04-23 14:59:40 C 21 24 32.249 +15 34 23.59 V T05
2023-04-25 14:29:06 C 21 32 29.273 +16 12 06.52 V T05
2023-04-25 14:35:05 C 21 32 30.283 +16 12 11.09 V T05
2023-04-25 14:58:58 C 21 32 34.291 +16 12 30.13 V T05
2023-04-25 15:08:28 C 21 32 35.890 +16 12 37.73 V T05
2023-04-28 08:52:12 C 21 43 57.518 +17 04 27.77 V W68
2023-04-28 08:56:47 C 21 43 58.322 +17 04 31.51 V W68
2023-04-28 09:06:39 C 21 44 00.034 +17 04 39.07 V W68
2023-04-28 09:24:00 C 21 44 03.046 +17 04 52.61 V W68
2023-05-03 14:21:34 C 22 06 55.234 +18 40 24.49 V T05
2023-05-03 14:48:01 C 22 07 00.218 +18 40 44.51 V T05
2023-05-03 14:55:23 C 22 07 01.608 +18 40 50.09 V T05
2023-05-03 15:01:40 C 22 07 02.782 +18 40 54.88 V T05
2023-05-04 09:02:42 C 22 10 29.674 +18 54 26.68 V W68
2023-05-04 09:09:34 C 22 10 30.977 +18 54 31.61 V W68
2023-05-04 09:27:26 C 22 10 34.382 +18 54 45.11 V W68
2023-05-04 09:32:05 C 22 10 35.285 +18 54 48.85 V W68
2023-05-05 14:24:21 C 22 16 12.091 +19 15 52.56 V T05
2023-05-05 14:30:14 C 22 16 13.248 +19 15 56.81 V T05
2023-05-05 14:45:56 C 22 16 16.303 +19 16 08.47 V T05
2023-05-07 14:20:59 C 22 25 45.461 +19 50 17.81 V T05
2023-05-07 14:26:51 C 22 25 46.637 +19 50 21.88 V T05
2023-05-07 14:46:52 C 22 25 50.662 +19 50 36.35 V T05
2023-05-07 14:57:37 C 22 25 52.831 +19 50 43.80 V T05
2023-05-10 09:28:24 C 22 39 39.410 +20 36 39.96 V W68
2023-05-10 09:31:01 C 22 39 39.970 +20 36 41.62 V W68
2023-05-10 09:52:06 C 22 39 44.390 +20 36 56.23 V W68
2023-05-10 10:07:04 C 22 39 47.539 +20 37 06.17 V W68
2023-05-13 14:21:20 C 22 56 22.469 +21 25 59.48 V T05
2023-05-13 14:21:59 C 22 56 22.613 +21 25 59.88 V T05
2023-05-13 14:27:19 C 22 56 23.796 +21 26 03.26 V T05
2023-05-13 14:27:58 C 22 56 23.935 +21 26 03.66 V T05
2023-05-13 14:35:53 C 22 56 25.690 +21 26 08.56 V T05
2023-05-13 14:55:18 C 22 56 29.971 +21 26 20.69 V T05
2023-05-13 14:55:57 C 22 56 30.144 +21 26 21.34 V T05
2023-05-17 01:20:59 C 23 15 25.01 +22 14 04.0 V C23
2023-05-17 01:26:23 C 23 15 26.22 +22 14 07.0 V C23
2023-05-17 01:31:47 C 23 15 27.53 +22 14 09.6 V C23
2023-05-21 14:10:16 C 23 42 01.152 +23 06 54.83 V T05
2023-05-21 14:26:22 C 23 42 05.203 +23 07 01.92 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)