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
2011-05-13 08:10:28 C 19 04 26.34 +51 42 13.2 15.6 c 704
2011-05-13 08:24:42 C 19 04 26.15 +51 42 38.3 15.7 c 704
2011-05-13 08:38:36 C 19 04 25.91 +51 43 03.0 15.7 c 704
2011-05-13 08:52:30 C 19 04 25.67 +51 43 27.7 15.6 c 704
2011-05-13 09:06:28 C 19 04 25.42 +51 43 52.4 15.9 c 704
2011-05-14 13:22:24 C 19 04 05.31 +52 33 09.5 o 300
2011-05-14 13:24:01 C 19 04 05.28 +52 33 12.9 o 300
2011-05-14 13:26:24 C 19 04 05.22 +52 33 16.6 o 300
2011-05-14 13:27:13 C 19 04 05.28 +52 33 17.8 o 300
2011-05-16 23:21:12 C 19 03 03.15 +54 14 14.2 c A24
2011-05-16 23:21:54 C 19 03 03.12 +54 14 15.3 c A24
2011-05-23 00:00:12 C 18 58 20.99 +58 24 11.6 c A24
2011-05-23 00:01:14 C 18 58 20.94 +58 24 13.3 c A24
2011-05-23 01:07:42 C 18 58 17.57 +58 26 08.7 c A24
2011-05-23 01:08:44 C 18 58 17.52 +58 26 10.5 c A24
2011-05-23 20:54:16 C 18 57 23.35 +58 59 53.3 c A24
2011-05-23 20:55:20 C 18 57 23.29 +58 59 55.1 c A24
2011-05-30 01:00:45 C 18 47 48.29 +63 10 57.7 c A24
2011-05-30 02:07:09 C 18 47 42.23 +63 12 48.7 c A24
2011-05-30 02:08:12 C 18 47 42.14 +63 12 50.4 c A24
2011-06-06 07:42:04 C 18 28 24.02 +67 58 20.9 r 703
2011-06-06 07:50:21 C 18 28 22.72 +67 58 34.3 r 703
2011-06-06 07:58:42 C 18 28 21.39 +67 58 48.0 r 703
2011-06-13 06:32:24 C 17 56 32.41 +72 19 14.5 15.2 c 704
2011-06-13 06:47:59 C 17 56 28.34 +72 19 38.2 15.3 c 704
2011-06-13 07:03:26 C 17 56 24.24 +72 20 01.9 15.4 c 704
2011-06-13 07:19:13 C 17 56 20.09 +72 20 25.4 15.8 c 704
2011-06-13 07:34:37 C 17 56 16.07 +72 20 48.9 15.4 c 704
2011-06-13 21:23:25 C 17 52 47.15 +72 41 26.5 c A24
2011-06-13 22:32:31 C 17 52 28.28 +72 43 11.0 c A24
2011-06-13 22:32:53 C 17 52 28.18 +72 43 11.7 c A24
2011-06-14 21:31:14 C 17 46 14.42 +73 17 11.7 c A24
2011-06-14 21:31:37 C 17 46 14.25 +73 17 12.6 c A24
2011-06-14 22:40:57 C 17 45 53.75 +73 18 55.7 c A24
2011-06-14 22:41:19 C 17 45 53.64 +73 18 56.6 c A24
2011-06-19 21:48:55 C 17 03 56.28 +76 04 06.2 c A24
2011-06-19 21:49:58 C 17 03 55.85 +76 04 07.4 c A24
2011-06-19 22:56:07 C 17 03 25.88 +76 05 33.4 c A24
2011-06-19 22:57:10 C 17 03 25.51 +76 05 33.9 c A24
2011-06-20 21:30:20 C 16 53 14.59 +76 33 47.2 c A24
2011-06-20 21:31:22 C 16 53 14.17 +76 33 48.1 c A24
2011-06-20 22:38:37 C 16 52 41.09 +76 35 10.9 c A24
2011-06-23 21:18:47 C 16 14 42.79 +77 53 34.8 c A24
2011-06-23 21:19:49 C 16 14 42.23 +77 53 35.6 c A24
2011-06-23 22:17:33 C 16 14 05.81 +77 54 32.1 c A24
2011-06-23 22:18:35 C 16 14 05.15 +77 54 32.9 c A24
2011-06-24 21:53:04 C 15 59 11.41 +78 16 19.0 c A24
2011-06-24 21:54:06 C 15 59 10.87 +78 16 19.6 c A24
2011-06-24 22:56:42 C 15 58 28.22 +78 17 12.8 c A24
2011-06-24 22:57:44 C 15 58 27.71 +78 17 13.3 c A24
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)