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
2025-05-14 20:36:33 B 13 52 48.283 +62 47 42.22 Z K35
2025-05-14 20:37:34 B 13 52 48.134 +62 47 41.42 Z K35
2025-05-14 20:38:36 B 13 52 48.005 +62 47 40.63 Z K35
2025-05-14 20:39:38 B 13 52 47.851 +62 47 39.77 Z K35
2025-05-14 20:39:45 C 13 52 47.981 +62 47 39.19 Z C23
2025-05-14 20:40:39 B 13 52 47.702 +62 47 38.94 Z K35
2025-05-15 08:16:05 C 13 51 12.298 +62 37 55.20 V 703
2025-05-15 08:19:34 C 13 51 11.812 +62 37 52.00 V 703
2025-05-15 08:23:03 C 13 51 11.300 +62 37 49.08 V 703
2025-05-15 08:26:33 C 13 51 10.847 +62 37 45.95 V 703
2025-05-15 21:01:05 B 13 49 33.446 +62 26 58.09 V L65
2025-05-15 21:05:16 B 13 49 32.856 +62 26 54.38 V L65
2025-05-15 21:09:27 B 13 49 32.263 +62 26 50.64 V L65
2025-05-16 01:58:20 B 13 48 53.66 +62 22 36.9 Z M61
2025-05-16 02:19:22 B 13 48 50.89 +62 22 18.0 Z M61
2025-05-16 02:39:50 B 13 48 48.23 +62 21 59.6 Z M61
2025-05-16 10:15:47 C 13 47 50.978 +62 15 35.24 V T05
2025-05-16 10:20:22 C 13 47 50.350 +62 15 31.28 V T05
2025-05-16 10:28:16 C 13 47 49.313 +62 15 24.12 V T05
2025-05-16 10:43:29 C 13 47 47.266 +62 15 10.37 V T05
2025-05-16 20:45:04 B 13 46 34.078 +62 06 15.23 V L65
2025-05-16 20:48:59 B 13 46 33.574 +62 06 11.81 V L65
2025-05-16 20:52:39 B 13 46 33.084 +62 06 08.57 V L65
2025-05-16 22:22:03 B 13 46 22.394 +62 04 55.49 W J51
2025-05-16 22:28:51 B 13 46 21.451 +62 04 49.58 W J51
2025-05-16 22:35:40 B 13 46 20.563 +62 04 43.75 W J51
2025-05-16 23:45:23 C 13 46 11.477 +62 03 42.01 V R17
2025-05-17 00:06:01 C 13 46 08.784 +62 03 23.65 V R17
2025-05-17 00:26:30 C 13 46 06.113 +62 03 05.11 V R17
2025-05-17 00:47:06 C 13 46 03.434 +62 02 46.43 V R17
2025-05-17 07:11:49 C 13 45 17.003 +61 57 02.74 V 703
2025-05-17 07:15:13 C 13 45 16.600 +61 56 59.46 V 703
2025-05-17 07:18:37 C 13 45 16.153 +61 56 56.62 V 703
2025-05-17 07:22:01 C 13 45 15.721 +61 56 53.38 V 703
2025-05-18 11:16:35 C 13 42 01.114 +61 31 37.88 V T08
2025-05-18 11:20:41 C 13 42 00.612 +61 31 34.00 V T08
2025-05-18 11:28:04 C 13 41 59.748 +61 31 26.94 V T08
2025-05-18 11:42:45 C 13 41 58.010 +61 31 12.83 V T08
2025-05-18 21:05:34 B 13 40 57.379 +61 22 31.66 Z K35
2025-05-18 21:06:34 B 13 40 57.295 +61 22 30.72 Z K35
2025-05-18 21:08:39 B 13 40 57.062 +61 22 28.70 Z K35
2025-05-19 07:14:23 C 13 39 50.479 +61 13 09.30 V 703
2025-05-19 07:17:49 C 13 39 50.094 +61 13 05.95 V 703
2025-05-19 07:21:15 C 13 39 49.712 +61 13 02.68 V 703
2025-05-19 07:24:41 C 13 39 49.327 +61 12 59.22 V 703
2025-05-19 20:49:04 B 13 38 25.886 +61 00 21.24 V L65
2025-05-19 20:52:29 B 13 38 25.514 +61 00 18.68 Z K35
2025-05-19 20:53:15 B 13 38 25.435 +61 00 17.32 V L65
2025-05-19 20:53:31 B 13 38 25.416 +61 00 17.82 Z K35
2025-05-19 20:54:33 B 13 38 25.282 +61 00 16.60 Z K35
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)