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
2025-06-07 21:55:49 C 13 12 17.15 +52 59 08.0 X D04
2025-06-07 22:00:10 C 13 12 17.04 +52 59 03.7 X D04
2025-06-07 22:04:30 C 13 12 16.89 +52 58 58.2 X D04
2025-06-08 06:29:36 C 13 12 06.404 +52 49 38.50 V 703
2025-06-08 06:32:43 C 13 12 06.322 +52 49 35.18 V 703
2025-06-08 06:35:49 C 13 12 06.260 +52 49 31.40 V 703
2025-06-08 06:38:55 C 13 12 06.188 +52 49 27.91 V 703
2025-06-08 19:34:59 C 13 11 51.31 +52 34 57.7 X C40
2025-06-08 19:37:13 C 13 11 51.23 +52 34 55.2 X C40
2025-06-08 19:39:26 C 13 11 51.20 +52 34 52.6 X C40
2025-06-08 19:41:39 C 13 11 51.15 +52 34 49.8 X C40
2025-06-08 19:43:52 C 13 11 51.07 +52 34 47.4 X C40
2025-06-08 19:46:05 C 13 11 51.03 +52 34 45.0 X C40
2025-06-08 19:48:19 C 13 11 50.98 +52 34 42.6 X C40
2025-06-08 19:50:32 C 13 11 50.90 +52 34 40.0 X C40
2025-06-08 19:52:39 C 13 11 50.88 +52 34 37.6 X C40
2025-06-08 19:54:40 C 13 11 50.82 +52 34 35.4 X C40
2025-06-08 19:56:42 C 13 11 50.78 +52 34 33.0 X C40
2025-06-08 19:58:44 C 13 11 50.72 +52 34 30.7 X C40
2025-06-08 20:00:49 C 13 11 50.61 +52 34 28.0 Z S93
2025-06-08 20:03:53 C 13 11 50.54 +52 34 24.6 Z S93
2025-06-08 20:06:57 C 13 11 50.46 +52 34 21.1 Z S93
2025-06-08 20:42:08 C 13 11 49.67 +52 33 40.3 Z S93
2025-06-08 20:44:13 C 13 11 49.62 +52 33 38.1 Z S93
2025-06-08 20:46:16 C 13 11 49.58 +52 33 36.3 Z S93
2025-06-09 07:28:10 C 13 11 38.376 +52 21 44.06 V T05
2025-06-09 07:33:25 C 13 11 38.256 +52 21 38.02 V T05
2025-06-09 07:43:22 C 13 11 38.011 +52 21 26.71 V T05
2025-06-09 07:58:18 C 13 11 37.661 +52 21 09.76 V T05
2025-06-09 19:01:48 B 13 11 25.980 +52 08 42.40 W M73
2025-06-09 19:09:25 B 13 11 25.867 +52 08 33.40 W M73
2025-06-09 19:17:16 B 13 11 25.711 +52 08 24.36 W M73
2025-06-09 19:43:56 C 13 11 25.60 +52 07 50.7 X C40
2025-06-09 19:46:08 C 13 11 25.57 +52 07 48.3 X C40
2025-06-09 19:48:20 C 13 11 25.52 +52 07 45.8 X C40
2025-06-09 19:49:52 B 13 11 25.51 +52 07 43.8 X L76
2025-06-09 19:50:33 C 13 11 25.48 +52 07 43.1 X C40
2025-06-09 19:52:46 C 13 11 25.43 +52 07 40.6 X C40
2025-06-09 19:54:59 C 13 11 25.38 +52 07 38.2 X C40
2025-06-09 19:56:02 B 13 11 25.39 +52 07 36.5 X L76
2025-06-09 19:57:12 C 13 11 25.34 +52 07 35.5 X C40
2025-06-09 19:59:25 C 13 11 25.30 +52 07 33.0 X C40
2025-06-09 20:01:32 C 13 11 25.26 +52 07 30.7 X C40
2025-06-09 20:02:11 B 13 11 25.25 +52 07 29.6 X L76
2025-06-09 20:03:35 C 13 11 25.22 +52 07 28.3 X C40
2025-06-09 20:05:37 C 13 11 25.18 +52 07 26.0 X C40
2025-06-09 20:07:38 C 13 11 25.14 +52 07 23.8 X C40
2025-06-09 20:08:20 B 13 11 25.14 +52 07 22.6 X L76
2025-06-09 20:14:28 B 13 11 25.01 +52 07 15.4 X L76
2025-06-09 21:15:55 C 13 11 23.82 +52 06 05.7 X D04
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)