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
2025-04-19 02:08:04 C 16 12 36.800 +65 15 25.96 W M01
2025-04-19 02:10:34 C 16 12 36.074 +65 15 27.48 W M01
2025-04-19 02:13:04 C 16 12 35.347 +65 15 29.00 W M01
2025-04-19 18:42:27 C 16 08 04.958 +65 25 36.21 W M01
2025-04-19 18:44:18 C 16 08 04.450 +65 25 37.56 W M01
2025-04-19 18:44:57 C 16 08 04.254 +65 25 37.94 W M01
2025-04-19 18:46:48 C 16 08 03.756 +65 25 39.29 W M01
2025-04-19 18:47:27 C 16 08 03.550 +65 25 39.67 W M01
2025-04-19 18:49:18 C 16 08 03.062 +65 25 41.01 W M01
2025-04-19 19:47:15 C 16 07 46.648 +65 26 19.18 W M01
2025-04-19 19:49:45 C 16 07 45.938 +65 26 20.83 W M01
2025-04-19 19:50:17 C 16 07 45.788 +65 26 21.30 W M01
2025-04-19 19:52:15 C 16 07 45.228 +65 26 22.48 W M01
2025-04-19 19:52:47 C 16 07 45.078 +65 26 22.95 W M01
2025-04-19 19:55:17 C 16 07 44.367 +65 26 24.61 W M01
2025-04-19 20:46:23 C 16 07 29.738 +65 26 57.61 W M01
2025-04-19 20:48:53 C 16 07 29.024 +65 26 59.22 W M01
2025-04-19 20:51:23 C 16 07 28.309 +65 27 00.83 W M01
2025-04-19 20:58:29 C 16 07 26.260 +65 27 05.41 W M01
2025-04-19 21:00:59 C 16 07 25.544 +65 27 07.03 W M01
2025-04-19 21:03:29 C 16 07 24.828 +65 27 08.65 W M01
2025-04-19 21:45:54 C 16 07 12.571 +65 27 35.19 W M01
2025-04-19 21:48:24 C 16 07 11.848 +65 27 36.72 W M01
2025-04-19 21:50:54 C 16 07 11.125 +65 27 38.24 W M01
2025-04-19 22:03:34 C 16 07 07.450 +65 27 46.27 W M01
2025-04-19 22:06:04 C 16 07 06.729 +65 27 47.80 W M01
2025-04-19 22:08:34 C 16 07 06.008 +65 27 49.33 W M01
2025-04-19 22:43:44 C 16 06 55.780 +65 28 10.58 W M01
2025-04-19 22:46:14 C 16 06 55.055 +65 28 12.09 W M01
2025-04-19 22:48:45 C 16 06 54.329 +65 28 13.59 W M01
2025-04-19 23:11:15 C 16 06 47.726 +65 28 26.99 W M01
2025-04-19 23:13:45 C 16 06 46.994 +65 28 28.47 W M01
2025-04-19 23:16:15 C 16 06 46.262 +65 28 29.94 W M01
2025-04-19 23:43:14 C 16 06 38.390 +65 28 45.66 W M01
2025-04-19 23:45:44 C 16 06 37.655 +65 28 47.11 W M01
2025-04-19 23:48:14 C 16 06 36.919 +65 28 48.55 W M01
2025-04-20 00:21:09 C 16 06 27.357 +65 29 07.50 W M01
2025-04-20 00:23:39 C 16 06 26.621 +65 29 08.91 W M01
2025-04-20 00:26:09 C 16 06 25.885 +65 29 10.32 W M01
2025-04-20 00:38:43 C 16 06 22.223 +65 29 17.28 W M01
2025-04-20 00:41:13 C 16 06 21.487 +65 29 18.67 W M01
2025-04-20 00:43:43 C 16 06 20.751 +65 29 20.05 W M01
2025-04-20 00:50:05 B 16 06 20.117 +65 29 16.26 V L65
2025-04-20 00:54:15 B 16 06 18.914 +65 29 18.64 V L65
2025-04-20 00:58:27 B 16 06 17.688 +65 29 20.98 V L65
2025-04-20 01:04:36 C 16 06 14.700 +65 29 31.76 W M01
2025-04-20 01:07:06 C 16 06 13.972 +65 29 33.15 W M01
2025-04-20 01:09:36 C 16 06 13.244 +65 29 34.53 W M01
2025-04-20 01:15:53 C 16 06 11.422 +65 29 37.94 W M01
2025-04-20 01:18:23 C 16 06 10.692 +65 29 39.30 W M01
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)