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
2025-04-26 10:32:51 C 15 23 56.114 +66 16 17.44 V T05
2025-04-26 10:40:09 C 15 23 54.053 +66 16 17.90 V T05
2025-04-26 22:21:00 C 15 20 47.537 +66 16 30.32 Z C23
2025-04-26 22:48:01 C 15 20 40.157 +66 16 30.97 Z C23
2025-04-26 23:27:56 C 15 20 29.222 +66 16 32.45 Z C23
2025-04-27 09:23:36 C 15 17 50.208 +66 16 36.12 V 703
2025-04-27 09:27:01 C 15 17 49.250 +66 16 35.69 V 703
2025-04-27 09:30:27 C 15 17 48.314 +66 16 35.62 V 703
2025-04-27 09:33:54 C 15 17 47.360 +66 16 35.44 V 703
2025-04-27 22:12:10 C 15 14 30.55 +66 15 59.9 Z C23
2025-04-27 22:26:12 C 15 14 26.85 +66 15 59.1 Z C23
2025-04-27 22:34:58 C 15 14 24.16 +66 15 58.0 Z C23
2025-04-27 23:44:05 B 15 14 05.654 +66 15 55.33 V L65
2025-04-27 23:48:15 B 15 14 04.519 +66 15 55.08 V L65
2025-04-27 23:52:26 B 15 14 03.377 +66 15 54.90 V L65
2025-04-28 02:58:16 B 15 13 13.762 +66 15 42.23 q Y84
2025-04-28 03:03:46 B 15 13 12.281 +66 15 41.76 q Y84
2025-04-28 03:09:16 B 15 13 10.814 +66 15 41.18 q Y84
2025-04-28 11:58:59 C 15 10 54.127 +66 15 06.52 V T08
2025-04-28 12:04:24 C 15 10 52.654 +66 15 05.90 V T08
2025-04-28 12:47:20 C 15 10 41.052 +66 15 00.65 V T08
2025-04-28 12:56:03 C 15 10 38.698 +66 14 59.42 V T08
2025-04-28 19:10:51 B 15 09 05.60 +66 14 05.6 X G02
2025-04-28 19:15:19 B 15 09 04.45 +66 14 05.2 X G02
2025-04-28 19:19:37 B 15 09 03.35 +66 14 04.9 X G02
2025-04-29 00:17:24 B 15 07 45.151 +66 13 33.71 X K87
2025-04-29 00:20:33 B 15 07 44.362 +66 13 33.35 X K87
2025-04-29 00:23:04 B 15 07 43.766 +66 13 31.91 V L65
2025-04-29 00:23:43 B 15 07 43.567 +66 13 33.06 X K87
2025-04-29 00:27:15 B 15 07 42.679 +66 13 31.30 V L65
2025-04-29 00:31:26 B 15 07 41.580 +66 13 30.83 V L65
2025-04-29 01:29:05 C 15 07 27.300 +66 13 30.54 V R17
2025-04-29 01:39:44 C 15 07 23.755 +66 13 22.51 q C18
2025-04-29 01:52:15 C 15 07 21.120 +66 13 27.41 V R17
2025-04-29 02:13:20 C 15 07 15.490 +66 13 24.49 V R17
2025-04-29 02:34:28 C 15 07 09.840 +66 13 21.36 V R17
2025-04-29 02:59:11 C 15 07 03.012 +66 13 09.48 q C18
2025-04-29 09:22:14 C 15 05 26.066 +66 12 19.30 V 703
2025-04-29 09:25:41 C 15 05 25.152 +66 12 18.54 V 703
2025-04-29 09:29:09 C 15 05 24.238 +66 12 17.96 V 703
2025-04-29 09:32:37 C 15 05 23.330 +66 12 17.42 V 703
2025-04-29 17:46:53 C 15 03 21.11 +66 10 45.0 q 168
2025-04-29 18:14:07 C 15 03 14.10 +66 10 40.8 q 168
2025-04-29 18:44:15 C 15 03 06.35 +66 10 36.0 q 168
2025-04-29 19:15:03 C 15 02 58.43 +66 10 30.9 q 168
2025-04-29 19:51:09 C 15 02 49.13 +66 10 24.5 q 168
2025-04-29 21:51:38 C 15 02 19.862 +66 10 01.96 Z C23
2025-04-29 22:47:09 C 15 02 05.520 +66 09 51.52 Z C23
2025-04-29 22:55:04 B 15 02 03.379 +66 09 50.65 V L65
2025-04-29 22:59:15 B 15 02 02.306 +66 09 49.86 V L65
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)