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
2025-05-23 23:00:49 C 13 29 24.98 +59 24 28.5 X C40
2025-05-23 23:03:02 C 13 29 24.78 +59 24 26.2 X C40
2025-05-23 23:05:09 C 13 29 24.62 +59 24 23.9 X C40
2025-05-23 23:07:10 C 13 29 24.45 +59 24 21.8 X C40
2025-05-23 23:09:11 C 13 29 24.28 +59 24 19.6 X C40
2025-05-23 23:11:13 C 13 29 24.11 +59 24 17.6 X C40
2025-05-24 05:43:42 C 13 28 53.774 +59 17 50.46 V G96
2025-05-24 05:51:55 C 13 28 53.072 +59 17 42.07 V G96
2025-05-24 06:00:08 C 13 28 52.374 +59 17 33.58 V G96
2025-05-24 06:08:21 C 13 28 51.665 +59 17 25.15 V G96
2025-05-24 10:51:08 C 13 28 28.807 +59 12 38.95 V T05
2025-05-24 10:55:43 C 13 28 28.423 +59 12 33.98 V T05
2025-05-24 11:10:14 C 13 28 27.230 +59 12 18.86 V T05
2025-05-24 11:23:29 C 13 28 26.124 +59 12 04.90 V T05
2025-05-24 19:43:10 B 13 27 49.42 +59 03 36.1 X G02
2025-05-24 19:46:45 B 13 27 49.12 +59 03 32.6 X G02
2025-05-24 19:50:09 B 13 27 48.86 +59 03 29.1 X G02
2025-05-24 21:13:26 C 13 27 41.63 +59 02 03.5 X C40
2025-05-24 21:15:39 C 13 27 41.45 +59 02 01.2 X C40
2025-05-24 21:17:51 C 13 27 41.27 +59 01 58.9 X C40
2025-05-24 21:20:04 C 13 27 41.10 +59 01 56.6 X C40
2025-05-24 21:22:16 C 13 27 40.92 +59 01 54.3 X C40
2025-05-24 21:24:28 C 13 27 40.75 +59 01 52.0 X C40
2025-05-24 21:26:41 C 13 27 40.56 +59 01 49.7 X C40
2025-05-24 21:28:53 C 13 27 40.39 +59 01 47.4 X C40
2025-05-24 21:31:00 C 13 27 40.22 +59 01 45.2 X C40
2025-05-24 21:33:02 C 13 27 40.06 +59 01 43.0 X C40
2025-05-24 21:35:02 C 13 27 39.89 +59 01 41.0 X C40
2025-05-24 21:37:04 C 13 27 39.74 +59 01 38.8 X C40
2025-05-24 21:38:31 B 13 27 40.183 +59 01 37.88 W G34
2025-05-24 21:40:37 B 13 27 40.020 +59 01 35.66 W G34
2025-05-24 21:45:48 B 13 27 39.592 +59 01 30.38 W G34
2025-05-24 22:22:46 B 13 27 37.262 +59 00 58.82 W J51
2025-05-24 22:30:40 B 13 27 36.610 +59 00 50.76 W J51
2025-05-24 22:32:32 B 13 27 35.37 +59 00 40.2 X L76
2025-05-24 22:37:47 B 13 27 34.94 +59 00 34.8 X L76
2025-05-24 22:38:35 B 13 27 35.923 +59 00 42.73 W J51
2025-05-24 22:43:02 B 13 27 34.54 +59 00 29.1 X L76
2025-05-24 22:48:16 B 13 27 34.13 +59 00 23.5 X L76
2025-05-24 22:53:31 B 13 27 33.73 +59 00 18.1 X L76
2025-05-24 22:58:46 B 13 27 33.31 +59 00 12.5 X L76
2025-05-25 07:19:13 C 13 26 56.81 +58 51 45.2 V U55
2025-05-25 07:30:39 C 13 26 55.90 +58 51 33.4 V U55
2025-05-25 07:42:15 C 13 26 55.00 +58 51 21.4 V U55
2025-05-25 22:51:23 B 13 25 50.234 +58 35 54.46 W J51
2025-05-25 23:01:32 B 13 25 49.428 +58 35 44.05 W J51
2025-05-25 23:11:42 B 13 25 48.660 +58 35 33.25 W J51
2025-05-26 07:39:43 C 13 25 12.698 +58 26 45.02 V 703
2025-05-26 07:43:09 C 13 25 12.436 +58 26 41.53 V 703
2025-05-26 07:47:06 C 13 25 12.130 +58 26 37.25 V 703
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)