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
2022-04-14 21:36:20 C 11 37 06.34 +78 05 51.0 q B92
2022-04-14 23:01:58 C 11 37 06.30 +78 02 34.8 q B92
2022-04-15 16:18:08 C 11 37 32.30 +77 23 38.5 Y N42
2022-04-15 16:19:17 C 11 37 32.30 +77 23 36.0 Y N42
2022-04-15 16:20:51 C 11 37 32.30 +77 23 32.4 Y N42
2022-04-15 16:21:38 C 11 37 32.30 +77 23 30.8 Y N42
2022-04-15 16:23:13 C 11 37 32.30 +77 23 27.3 Y N42
2022-04-15 16:24:00 C 11 37 32.30 +77 23 25.6 Y N42
2022-04-15 16:24:47 C 11 37 32.30 +77 23 23.8 Y N42
2022-04-15 16:25:34 C 11 37 32.30 +77 23 22.0 Y N42
2022-04-15 19:57:55 C 11 37 38.61 +77 15 28.3 q A77
2022-04-15 20:35:11 C 11 37 38.63 +77 14 06.9 q A77
2022-04-15 21:08:02 C 11 37 38.61 +77 12 54.5 q A77
2022-04-15 21:41:48 C 11 37 38.63 +77 11 40.1 q A77
2022-04-15 22:04:31 C 11 37 39.89 +77 10 53.0 Z Z04
2022-04-15 23:32:16 C 11 37 39.54 +77 07 38.9 Z Z04
2022-04-15 23:51:21 C 11 37 38.71 +77 06 51.6 q A77
2022-04-16 00:23:22 C 11 37 38.82 +77 05 39.8 q A77
2022-04-16 00:55:22 C 11 37 38.95 +77 04 27.5 q A77
2022-04-16 00:59:55 C 11 37 39.38 +77 04 22.5 Z Z04
2022-04-16 19:40:11 C 11 38 09.81 +76 23 45.5 V C23
2022-04-16 19:45:08 C 11 38 09.91 +76 23 35.2 V C23
2022-04-16 19:50:04 C 11 38 09.92 +76 23 24.7 V C23
2022-04-16 21:00:45 C 11 38 09.727 +76 20 55.25 V K74
2022-04-16 21:03:57 C 11 38 09.737 +76 20 48.66 V K74
2022-04-16 21:07:11 C 11 38 09.713 +76 20 41.68 V K74
2022-04-16 21:10:25 C 11 38 09.751 +76 20 34.69 V K74
2022-04-16 21:13:39 C 11 38 09.782 +76 20 27.85 V K74
2022-04-16 21:16:53 C 11 38 09.746 +76 20 20.80 V K74
2022-04-17 19:46:56 C 11 38 40.47 +75 32 54.4 V C23
2022-04-17 19:52:17 C 11 38 40.49 +75 32 43.5 V C23
2022-04-17 19:57:12 C 11 38 40.53 +75 32 33.2 V C23
2022-04-18 20:28:01 C 11 39 10.62 +74 42 29.6 V L65
2022-04-18 20:59:04 C 11 39 10.82 +74 41 27.3 V L65
2022-04-18 21:27:50 C 11 39 10.99 +74 40 29.6 V L65
2022-04-19 20:10:45 C 11 39 40.68 +73 55 30.1 V L65
2022-04-19 20:48:41 C 11 39 40.95 +73 54 16.4 V L65
2022-04-19 21:28:58 C 11 39 41.23 +73 52 57.9 V L65
2022-04-20 09:52:19 C 11 39 54.995 +73 29 07.58 U F52
2022-04-20 10:02:28 C 11 39 55.009 +73 28 47.15 U F52
2022-04-20 10:12:42 C 11 39 55.086 +73 28 26.94 U F52
2022-04-20 10:22:55 C 11 39 55.101 +73 28 06.87 U F52
2022-04-20 18:49:38 C 11 40 07.714 +73 12 00.14 V M44
2022-04-20 19:10:52 C 11 40 07.639 +73 11 19.32 V M44
2022-04-20 19:33:10 C 11 40 07.704 +73 10 36.70 V M44
2022-04-20 19:43:41 C 11 40 11.03 +73 10 08.6 V C23
2022-04-20 19:48:38 C 11 40 11.08 +73 09 59.2 V C23
2022-04-20 19:53:09 C 11 40 11.11 +73 09 50.5 V C23
2022-04-20 21:02:20 C 11 40 11.38 +73 07 39.5 V L65
2022-04-20 21:35:19 C 11 40 11.60 +73 06 37.4 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)