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
2025-07-12 19:23:55 C 13 20 02.79 +36 45 30.5 X C40
2025-07-13 06:53:38 C 13 20 21.355 +36 31 44.44 V T05
2025-07-13 06:58:57 C 13 20 21.502 +36 31 37.88 V T05
2025-07-13 07:08:54 C 13 20 21.727 +36 31 25.86 V T05
2025-07-13 07:36:32 C 13 20 22.390 +36 30 51.62 V T05
2025-07-13 19:03:19 C 13 20 41.12 +36 16 55.9 X C40
2025-07-13 19:05:44 C 13 20 41.18 +36 16 52.9 X C40
2025-07-13 19:08:10 C 13 20 41.24 +36 16 50.0 X C40
2025-07-13 19:10:35 C 13 20 41.30 +36 16 46.9 X C40
2025-07-13 19:12:59 C 13 20 41.36 +36 16 44.1 X C40
2025-07-13 19:15:24 C 13 20 41.42 +36 16 41.0 X C40
2025-07-13 19:17:49 C 13 20 41.46 +36 16 38.1 X C40
2025-07-13 19:20:14 C 13 20 41.54 +36 16 35.1 X C40
2025-07-13 19:22:33 C 13 20 41.60 +36 16 32.1 X C40
2025-07-13 19:24:46 C 13 20 41.65 +36 16 29.5 X C40
2025-07-13 19:26:59 C 13 20 41.72 +36 16 26.6 X C40
2025-07-13 19:29:12 C 13 20 41.76 +36 16 24.1 X C40
2025-07-13 21:15:59 C 13 20 44.822 +36 14 14.86 Z C23
2025-07-13 22:27:52 C 13 20 46.666 +36 12 45.76 Z C23
2025-07-14 07:18:50 C 13 21 01.078 +36 02 10.75 V T05
2025-07-14 07:20:09 C 13 21 01.118 +36 02 09.06 V T05
2025-07-14 07:24:11 C 13 21 01.217 +36 02 04.42 V T05
2025-07-14 07:25:30 C 13 21 01.248 +36 02 02.33 V T05
2025-07-14 07:31:37 C 13 21 01.382 +36 01 54.88 V T05
2025-07-14 07:38:16 C 13 21 01.553 +36 01 46.67 V T05
2025-07-14 07:45:40 C 13 21 01.740 +36 01 37.56 V T05
2025-07-14 08:09:33 C 13 21 02.321 +36 01 07.82 V T05
2025-07-14 22:29:16 B 13 21 26.42 +35 43 54.4 X X76
2025-07-14 22:34:17 B 13 21 26.44 +35 43 47.2 X X76
2025-07-14 22:39:58 B 13 21 26.54 +35 43 40.3 X X76
2025-07-16 07:28:34 C 13 22 20.854 +35 03 35.50 V T08
2025-07-16 07:42:45 C 13 22 21.187 +35 03 17.39 V T08
2025-07-16 07:50:54 C 13 22 21.408 +35 03 07.49 V T08
2025-07-16 16:44:37 B 13 22 36.511 +34 52 16.03 W M73
2025-07-16 16:49:30 B 13 22 36.634 +34 52 09.84 W M73
2025-07-16 21:21:03 C 13 22 44.299 +34 46 31.69 Z C23
2025-07-16 22:07:35 C 13 22 45.590 +34 45 33.62 Z C23
2025-07-17 18:47:06 C 13 23 20.39 +34 20 16.5 X C40
2025-07-17 18:49:31 C 13 23 20.45 +34 20 13.3 X C40
2025-07-17 18:51:55 C 13 23 20.52 +34 20 10.4 X C40
2025-07-17 18:54:20 C 13 23 20.57 +34 20 07.3 X C40
2025-07-17 18:56:45 C 13 23 20.66 +34 20 04.6 X C40
2025-07-17 18:59:09 C 13 23 20.71 +34 20 01.4 X C40
2025-07-17 19:01:33 C 13 23 20.77 +34 19 58.5 X C40
2025-07-17 19:03:57 C 13 23 20.84 +34 19 55.3 X C40
2025-07-17 19:06:16 C 13 23 20.90 +34 19 52.7 X C40
2025-07-17 19:08:28 C 13 23 20.97 +34 19 49.9 X C40
2025-07-17 19:10:41 C 13 23 21.01 +34 19 47.0 X C40
2025-07-17 19:12:52 C 13 23 21.06 +34 19 44.1 X C40
2025-07-18 07:10:09 C 13 23 41.256 +34 05 08.56 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)