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
2008-05-11 02:25:16 C 17 26 54.75 +58 56 37.6 o A74
2008-05-11 22:31:08 C 17 24 00.28 +59 20 10.7 o 084
2008-05-11 23:30:58 C 17 23 51.07 +59 21 20.7 o 084
2008-05-11 23:48:39 C 17 23 48.38 +59 21 41.2 o 084
2008-05-13 00:45:40 C 17 20 03.33 +59 49 59.5 c J51
2008-05-13 00:50:03 C 17 20 02.61 +59 50 04.5 c J51
2008-05-13 00:54:25 C 17 20 01.86 +59 50 09.1 c J51
2008-05-13 21:51:53 C 17 16 45.18 +60 12 48.1 c B67
2008-05-13 22:12:27 C 17 16 41.78 +60 13 09.9 c B67
2008-05-13 22:32:38 C 17 16 38.53 +60 13 31.9 c B67
2008-05-14 21:45:30 C 17 12 52.43 +60 37 37.7 o 084
2008-05-14 22:03:12 C 17 12 49.43 +60 37 56.1 o 084
2008-05-14 22:23:31 C 17 12 45.92 +60 38 17.2 o 084
2008-05-15 21:38:50 C 17 08 52.46 +61 01 20.0 o 084
2008-05-15 21:57:17 C 17 08 49.26 +61 01 38.0 o 084
2008-05-15 22:14:59 C 17 08 46.16 +61 01 55.3 o 084
2008-05-16 21:30:58 C 17 04 45.00 +61 23 49.9 o 084
2008-05-16 21:59:04 C 17 04 39.91 +61 24 16.1 o 084
2008-05-16 22:18:52 C 17 04 36.29 +61 24 34.5 o 084
2008-05-16 22:54:20 C 17 04 29.91 +61 25 07.0 o 084
2008-05-16 23:11:18 C 17 04 26.83 +61 25 22.8 o 084
2008-05-16 23:37:30 C 17 04 22.09 +61 25 46.7 o 084
2008-05-17 08:53:47 C 17 02 43.07 +61 34 15.6 r H45
2008-05-17 08:56:00 C 17 02 42.66 +61 34 17.5 r H45
2008-05-17 08:58:16 C 17 02 42.23 +61 34 19.5 r H45
2008-05-17 09:01:15 C 17 02 41.68 +61 34 22.1 r H45
2008-05-17 09:04:13 C 17 02 41.13 +61 34 24.7 r H45
2008-05-22 22:53:37 C 16 37 06.49 +63 14 05.9 o J51
2008-05-22 23:03:40 C 16 37 04.38 +63 14 12.3 o J51
2008-05-22 23:13:42 C 16 37 02.29 +63 14 18.7 o J51
2008-05-25 04:49:10 C 16 25 54.94 +63 42 38.7 o H51
2008-05-25 04:49:43 C 16 25 54.87 +63 42 39.0 o H51
2008-05-25 04:50:18 C 16 25 54.66 +63 42 39.0 o H51
2008-05-25 04:50:51 C 16 25 54.53 +63 42 39.2 o H51
2008-05-25 04:51:58 C 16 25 54.27 +63 42 39.8 o H51
2008-05-25 04:52:32 C 16 25 54.14 +63 42 39.9 o H51
2008-05-25 04:53:05 C 16 25 54.02 +63 42 40.1 o H51
2008-05-25 04:53:38 C 16 25 53.90 +63 42 40.4 o H51
2008-05-25 04:54:12 C 16 25 53.77 +63 42 40.6 o H51
2008-05-25 04:54:46 C 16 25 53.66 +63 42 40.9 o H51
2008-05-25 04:55:20 C 16 25 53.54 +63 42 41.3 o H51
2008-05-25 04:55:54 C 16 25 53.40 +63 42 41.4 o H51
2008-05-25 04:56:28 C 16 25 53.29 +63 42 41.6 o H51
2008-05-25 04:57:02 C 16 25 53.16 +63 42 42.0 o H51
2008-05-25 04:57:35 C 16 25 53.04 +63 42 42.3 o H51
2008-05-25 04:58:10 C 16 25 52.92 +63 42 42.6 o H51
2008-05-25 04:58:43 C 16 25 52.79 +63 42 42.8 o H51
2008-05-25 04:59:17 C 16 25 52.66 +63 42 43.1 o H51
2008-05-25 06:16:35 C 16 25 35.74 +63 43 19.5 o H51
2008-05-25 06:17:10 C 16 25 35.62 +63 43 19.8 o H51
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)