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
2013-04-29 04:14:00 C 06 50 35.01 +36 31 46.2 u G96
2013-04-29 04:20:48 C 06 50 37.06 +36 31 52.6 u G96
2013-05-01 01:19:27 C 07 03 59.54 +37 12 28.4 q I15
2013-05-01 01:22:48 C 07 04 00.52 +37 12 31.0 q I15
2013-05-01 01:26:09 C 07 04 01.49 +37 12 33.8 q I15
2013-05-04 00:31:20 C 07 24 39.43 +38 03 25.8 q I15
2013-05-04 00:34:38 C 07 24 40.35 +38 03 27.5 q I15
2013-05-04 00:37:57 C 07 24 41.31 +38 03 29.6 q I15
2013-05-06 23:10:24 C 07 44 26.60 +38 38 52.9 u J93
2013-05-06 23:15:31 C 07 44 28.03 +38 38 54.7 u J93
2013-05-06 23:23:13 C 07 44 30.10 +38 38 58.0 u J93
2013-05-10 20:23:51 C 08 09 18.71 +39 05 36.9 w I57
2013-05-10 20:24:30 C 08 09 18.88 +39 05 37.1 w I57
2013-05-10 20:27:48 C 08 09 19.68 +39 05 37.4 w I57
2013-05-13 19:30:25 C 08 27 15.89 +39 12 21.8 r 168
2013-05-13 19:34:05 C 08 27 16.79 +39 12 21.8 r 168
2013-05-13 20:33:55 C 08 27 31.55 +39 12 22.2 r 168
2013-05-13 20:35:55 C 08 27 32.04 +39 12 22.2 r 168
2013-05-17 12:02:42 C 08 48 21.22 +39 07 14.8 q D95
2013-05-17 12:07:21 C 08 48 22.28 +39 07 14.3 q D95
2013-05-17 12:08:54 C 08 48 22.66 +39 07 14.1 q D95
2013-05-19 02:15:50 C 08 57 01.91 +39 00 57.1 q H21
2013-05-19 02:20:25 C 08 57 02.94 +39 00 56.1 q H21
2013-05-19 02:25:27 C 08 57 04.05 +39 00 55.0 q H21
2013-05-19 02:30:53 C 08 57 05.26 +39 00 54.0 q H21
2013-05-19 02:35:55 C 08 57 06.37 +39 00 52.9 q H21
2013-05-20 04:14:50 C 09 02 47.00 +38 55 25.1 u 703
2013-05-20 04:22:05 C 09 02 48.58 +38 55 23.8 u 703
2013-05-20 04:29:21 C 09 02 50.17 +38 55 22.1 u 703
2013-05-20 04:36:39 C 09 02 51.72 +38 55 20.3 u 703
2013-05-25 22:09:46 C 09 31 26.21 +38 11 32.0 u I76
2013-05-25 22:16:31 C 09 31 27.49 +38 11 29.4 u I76
2013-05-25 22:23:00 C 09 31 28.76 +38 11 26.8 u I76
2013-06-04 02:15:06 C 10 11 19.24 +36 23 50.8 u H21
2013-06-04 02:18:28 C 10 11 19.80 +36 23 48.9 u H21
2013-06-04 02:21:37 C 10 11 20.31 +36 23 47.2 u H21
2013-06-04 02:24:57 C 10 11 20.87 +36 23 45.2 u H21
2013-06-04 02:28:17 C 10 11 21.43 +36 23 43.2 u H21
2013-06-04 02:31:49 C 10 11 22.02 +36 23 41.1 u H21
2013-06-06 03:50:56 C 10 19 27.66 +35 54 58.7 u 703
2013-06-06 03:59:36 C 10 19 29.02 +35 54 53.8 u 703
2013-06-06 04:08:29 C 10 19 30.43 +35 54 48.0 u 703
2013-06-06 04:17:17 C 10 19 31.83 +35 54 42.9 u 703
2013-06-11 02:17:12 C 10 37 50.59 +34 40 59.1 q H21
2013-06-11 02:23:05 C 10 37 51.45 +34 40 55.2 q H21
2013-06-11 02:28:57 C 10 37 52.32 +34 40 51.4 q H21
2013-06-11 02:34:50 C 10 37 53.20 +34 40 47.5 q H21
2013-06-11 21:09:59 C 10 40 38.75 +34 28 36.3 i C91
2013-06-11 21:13:00 C 10 40 39.18 +34 28 34.3 i C91
2013-06-11 21:17:59 C 10 40 39.92 +34 28 30.9 i C91
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)