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
2013-06-11 21:22:00 C 10 40 40.56 +34 28 28.4 i C91
2013-06-11 21:27:00 C 10 40 41.24 +34 28 24.9 i C91
2013-06-15 20:20:36 C 10 54 18.25 +33 24 22.7 q B38
2013-06-15 20:28:53 C 10 54 19.37 +33 24 16.9 q B38
2013-06-15 20:33:43 C 10 54 20.03 +33 24 13.3 q B38
2013-06-16 20:16:35 C 10 57 37.29 +33 07 46.7 a 233
2013-06-16 20:20:44 C 10 57 37.81 +33 07 43.6 a 233
2013-06-16 20:25:18 C 10 57 38.44 +33 07 40.6 a 233
2013-06-16 20:30:02 C 10 57 39.08 +33 07 37.3 a 233
2013-06-28 02:27:02 C 11 32 21.52 +29 50 23.2 u H21
2013-06-28 02:30:30 C 11 32 21.93 +29 50 20.6 u H21
2013-06-28 02:34:03 C 11 32 22.37 +29 50 17.7 u H21
2013-06-28 02:37:14 C 11 32 22.74 +29 50 15.1 u H21
2013-06-28 02:40:12 C 11 32 23.09 +29 50 13.0 u H21
2013-06-28 02:43:10 C 11 32 23.44 +29 50 10.7 u H21
2013-06-30 21:10:56 C 11 40 17.99 +28 59 20.2 v B38
2013-06-30 21:26:17 C 11 40 19.91 +28 59 08.5 v B38
2013-07-02 20:50:02 C 11 45 50.94 +28 22 27.4 q B38
2013-07-02 21:00:11 C 11 45 52.10 +28 22 19.9 q B38
2013-07-02 21:07:41 C 11 45 52.96 +28 22 13.5 q B38
2013-07-05 21:48:04 C 11 54 09.96 +27 25 18.2 q K20
2013-07-05 21:51:48 C 11 54 10.41 +27 25 16.3 q K20
2013-07-30 19:50:12 C 12 56 48.81 +19 14 32.1 o B38
2013-07-30 19:54:56 C 12 56 49.30 +19 14 28.8 o B38
2013-07-30 20:00:23 C 12 56 49.81 +19 14 23.5 o B38
2013-07-30 20:05:47 C 12 56 50.34 +19 14 19.1 o B38
2013-08-04 19:32:07 C 13 08 40.05 +17 32 08.5 o B38
2013-08-04 19:40:15 C 13 08 40.82 +17 32 01.2 o B38
2013-08-04 19:48:13 C 13 08 41.62 +17 31 55.1 o B38
2013-08-04 19:56:15 C 13 08 42.40 +17 31 47.7 o B38
2013-08-04 20:03:40 C 13 08 43.13 +17 31 41.0 o B38
2013-08-13 19:50:10 C 13 29 54.33 +14 23 40.1 q B38
2013-08-13 19:56:29 C 13 29 54.97 +14 23 34.3 o B38
2013-08-13 20:01:10 C 13 29 55.42 +14 23 30.3 o B38
2014-01-16 03:04:16 C 16 01 19.95 -13 55 43.9 o C41
2014-01-16 03:07:20 C 16 01 20.25 -13 55 40.5 o C41
2014-03-05 14:55:48 C 17 59 53.831 +04 52 50.58 L F51
2014-03-05 15:11:45 C 17 59 55.285 +04 53 08.01 L F51
2014-04-04 21:08:05 C 19 03 28.88 +19 36 45.8 o C94
2014-04-04 21:13:03 C 19 03 29.17 +19 36 51.4 o C94
2014-04-06 03:24:12 C 19 05 57.95 +20 17 48.5 q Z81
2014-04-06 03:50:48 C 19 06 00.08 +20 18 24.9 q Z81
2014-04-06 04:19:25 C 19 06 02.35 +20 19 04.1 q Z81
2014-04-08 04:16:26 C 19 09 57.05 +21 24 46.0 q G40
2014-04-08 04:32:01 C 19 09 58.27 +21 25 07.6 q G40
2014-04-08 04:56:49 C 19 10 00.22 +21 25 42.0 q G40
2014-04-09 10:23:01 C 19 12 23.40 +22 06 24.8 q H45
2014-04-09 10:25:30 C 19 12 23.60 +22 06 28.5 q H45
2014-04-09 10:26:34 C 19 12 23.68 +22 06 30.0 q H45
2014-04-09 10:27:53 C 19 12 23.79 +22 06 31.8 q H45
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)