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
2022-08-21 06:06:28 C 14 02 40.769 +13 18 05.90 V T08
2022-08-21 06:20:56 C 14 02 41.518 +13 17 46.25 V T08
2022-08-21 06:28:49 C 14 02 41.938 +13 17 35.70 V T08
2022-08-23 05:38:31 C 14 05 10.570 +12 14 06.58 V T08
2022-08-23 05:43:07 C 14 05 10.814 +12 14 00.38 V T08
2022-08-23 05:52:58 C 14 05 11.282 +12 13 46.92 V T08
2022-08-23 06:13:56 C 14 05 12.338 +12 13 18.08 V T08
2022-08-23 17:21:07 C 14 05 46.74 +11 58 03.8 V C40
2022-08-23 17:59:28 C 14 05 48.68 +11 57 11.9 V C40
2022-08-23 18:13:51 C 14 05 49.38 +11 56 52.3 V C40
2023-03-07 08:39:55 C 18 50 24.370 +01 41 09.53 V W68
2023-03-07 08:44:28 C 18 50 24.967 +01 41 12.37 V W68
2023-03-07 08:52:18 C 18 50 25.872 +01 41 17.27 V W68
2023-03-07 09:16:45 C 18 50 28.822 +01 41 32.06 V W68
2023-03-23 09:20:03 C 19 37 57.307 +05 56 12.98 V W68
2023-03-23 09:26:01 C 19 37 58.061 +05 56 17.56 V W68
2023-03-23 09:36:42 C 19 37 59.398 +05 56 24.94 V W68
2023-03-27 08:03:41 C 19 50 06.166 +07 04 31.12 V W68
2023-03-27 08:08:19 C 19 50 06.794 +07 04 34.86 V W68
2023-03-27 08:16:24 C 19 50 07.793 +07 04 40.58 V W68
2023-03-28 03:00:12 C 19 52 33.57 +07 18 13.9 V C23
2023-03-28 03:04:31 C 19 52 34.11 +07 18 17.3 V C23
2023-03-28 03:08:50 C 19 52 34.67 +07 18 20.7 V C23
2023-03-31 08:41:06 C 20 02 45.398 +08 16 06.10 V W68
2023-03-31 08:45:49 C 20 02 46.020 +08 16 09.52 V W68
2023-03-31 08:53:45 C 20 02 47.047 +08 16 15.56 V W68
2023-03-31 09:09:51 C 20 02 49.147 +08 16 27.66 V W68
2023-04-05 04:00:56 C 20 18 17.44 +09 43 35.2 V C23
2023-04-05 04:05:14 C 20 18 18.02 +09 43 38.6 V C23
2023-04-05 04:09:33 C 20 18 18.61 +09 43 42.8 V C23
2023-04-05 08:38:58 C 20 18 55.697 +09 47 20.08 V W68
2023-04-05 08:45:44 C 20 18 56.614 +09 47 25.40 V W68
2023-04-05 09:17:36 C 20 19 00.950 +09 47 49.99 V W68
2023-04-05 09:42:18 C 20 19 04.274 +09 48 08.96 V W68
2023-04-08 09:00:54 C 20 28 58.769 +10 43 27.91 V W68
2023-04-08 09:05:33 C 20 28 59.426 +10 43 31.73 V W68
2023-04-08 09:16:27 C 20 29 00.938 +10 43 40.26 V W68
2023-04-08 09:42:41 C 20 29 04.577 +10 44 00.89 V W68
2023-04-11 09:33:48 C 20 39 19.078 +11 40 26.36 V W68
2023-04-11 09:42:27 C 20 39 20.306 +11 40 33.49 V W68
2023-04-11 09:50:47 C 20 39 21.514 +11 40 40.01 V W68
2023-04-11 10:00:43 C 20 39 22.934 +11 40 48.04 V W68
2023-04-14 02:42:04 C 20 48 51.17 +12 31 52.9 V C23
2023-04-14 02:46:22 C 20 48 51.76 +12 31 56.0 V C23
2023-04-14 02:49:37 C 20 48 52.28 +12 31 58.7 V C23
2023-04-16 09:19:04 C 20 57 02.921 +13 15 37.76 V W68
2023-04-16 09:23:00 C 20 57 03.588 +13 15 42.08 V W68
2023-04-16 09:43:42 C 20 57 06.631 +13 15 57.53 V W68
2023-04-16 09:46:20 C 20 57 07.020 +13 15 59.83 V W68
2023-04-16 09:47:00 C 20 57 07.126 +13 16 00.12 V W68
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)