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
2025-03-30 13:17:50 C 18 01 55.872 +52 58 41.59 V T08
2025-04-01 12:51:13 C 17 53 15.185 +54 54 16.70 V T05
2025-04-01 12:59:39 C 17 53 13.519 +54 54 36.83 V T05
2025-04-01 13:04:20 C 17 53 12.583 +54 54 48.06 V T05
2025-04-01 21:20:38 C 17 51 38.971 +55 13 30.22 X S24
2025-04-01 21:25:41 C 17 51 38.026 +55 13 42.10 X S24
2025-04-01 21:30:14 C 17 51 37.150 +55 13 52.79 X S24
2025-04-01 21:52:10 C 17 51 32.880 +55 14 40.63 Z C23
2025-04-01 21:59:11 C 17 51 31.502 +55 14 57.08 Z C23
2025-04-02 23:27:46 C 17 46 36.000 +56 12 06.05 X M26
2025-04-02 23:29:49 C 17 46 35.580 +56 12 10.62 X M26
2025-04-02 23:31:54 C 17 46 35.167 +56 12 15.26 X M26
2025-04-02 23:33:57 C 17 46 34.752 +56 12 19.94 X M26
2025-04-02 23:36:03 C 17 46 34.339 +56 12 24.70 X M26
2025-04-04 12:39:06 C 17 39 06.444 +57 30 42.30 V T08
2025-04-04 13:10:48 C 17 38 59.570 +57 31 48.11 V T08
2025-04-04 13:30:55 C 17 38 55.190 +57 32 29.83 V T08
2025-04-04 20:51:07 C 17 37 24.511 +57 46 43.90 Z C23
2025-04-04 21:21:55 C 17 37 18.211 +57 47 46.90 Z C23
2025-04-04 21:51:39 C 17 37 12.031 +57 48 47.99 Z C23
2025-04-04 22:23:53 C 17 37 05.450 +57 49 58.44 X S24
2025-04-04 22:27:59 C 17 37 04.594 +57 50 06.79 X S24
2025-04-04 22:32:07 C 17 37 03.703 +57 50 15.29 X S24
2025-04-05 21:27:14 C 17 32 12.667 +58 34 36.62 Z C23
2025-04-05 22:07:45 C 17 32 04.027 +58 35 55.61 Z C23
2025-04-05 22:20:06 C 17 32 01.296 +58 36 20.12 Z C23
2025-04-07 01:40:21 B 17 26 02.275 +59 26 41.42 X K87
2025-04-07 01:42:28 B 17 26 01.778 +59 26 45.06 X K87
2025-04-07 01:44:34 B 17 26 01.294 +59 26 48.95 X K87
2025-04-07 02:13:01 C 17 25 54.876 +59 27 38.92 Z C23
2025-04-07 02:35:08 C 17 25 49.728 +59 28 18.95 Z C23
2025-04-07 11:02:25 C 17 23 56.260 +59 43 19.31 V 703
2025-04-07 11:05:34 C 17 23 55.504 +59 43 24.96 V 703
2025-04-07 11:08:44 C 17 23 54.762 +59 43 30.47 V 703
2025-04-07 11:11:53 C 17 23 54.013 +59 43 35.87 V 703
2025-04-07 17:49:17 C 17 22 26.57 +59 54 55.1 O40
2025-04-07 18:44:12 C 17 22 13.71 +59 56 32.7 O40
2025-04-07 19:37:43 C 17 22 01.06 +59 58 06.5 O40
2025-04-07 20:31:14 C 17 21 48.26 +59 59 39.6 O40
2025-04-07 21:29:53 C 17 21 36.245 +60 00 55.62 Z C23
2025-04-07 21:30:55 C 17 21 33.96 +60 01 22.1 O40
2025-04-07 21:54:40 C 17 21 30.626 +60 01 39.14 Z C23
2025-04-07 22:02:49 C 17 21 28.762 +60 01 53.62 Z C23
2025-04-08 12:33:14 C 17 18 08.899 +60 26 27.56 V T08
2025-04-08 12:37:17 C 17 18 07.918 +60 26 34.40 V T08
2025-04-08 12:46:47 C 17 18 05.599 +60 26 50.28 V T08
2025-04-08 13:03:07 C 17 18 01.620 +60 27 17.64 V T08
2025-04-08 14:57:24 C 17 17 36.89 +60 30 00.8 O40
2025-04-08 15:54:44 C 17 17 23.61 +60 31 38.9 O40
2025-04-08 16:51:18 C 17 17 10.34 +60 33 15.2 O40
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)