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
2025-03-21 14:02:29 C 18 35 44.191 +42 09 42.23 V T05
2025-03-21 14:04:33 C 18 35 43.874 +42 09 49.68 V T05
2025-03-21 14:24:15 C 18 35 40.910 +42 11 00.10 V T05
2025-03-23 14:30:18 C 18 28 44.767 +44 54 29.88 V T08
2025-03-23 14:44:36 C 18 28 42.516 +44 55 17.51 V T08
2025-03-23 14:49:27 C 18 28 41.748 +44 55 33.56 V T08
2025-03-23 15:04:59 C 18 28 39.295 +44 56 25.30 V T08
2025-03-24 23:08:38 C 18 23 51.93 +46 38 51.4 q 168
2025-03-24 23:35:35 C 18 23 47.70 +46 40 16.8 q 168
2025-03-24 23:55:38 C 18 23 44.55 +46 41 20.2 q 168
2025-03-25 14:40:59 C 18 21 29.532 +47 27 18.36 V T05
2025-03-25 14:48:56 C 18 21 28.224 +47 27 43.09 V T05
2025-03-25 14:54:51 C 18 21 27.245 +47 28 01.38 V T05
2025-03-25 15:12:07 C 18 21 24.379 +47 28 54.77 V T05
2025-03-25 15:28:10 C 18 21 21.713 +47 29 44.41 V T05
2025-03-26 13:54:11 C 18 17 52.553 +48 37 06.10 V T05
2025-03-26 14:02:49 C 18 17 51.096 +48 37 32.05 V T05
2025-03-26 14:05:27 C 18 17 50.642 +48 37 40.69 V T08
2025-03-26 14:13:28 C 18 17 49.289 +48 38 04.74 V T08
2025-03-26 23:47:28 C 18 16 18.439 +49 05 41.03 Z C23
2025-03-26 23:54:57 C 18 16 17.227 +49 06 03.60 Z C23
2025-03-27 00:02:37 C 18 16 15.996 +49 06 26.03 Z C23
2025-03-27 12:55:02 C 18 14 11.998 +49 43 51.28 V T08
2025-03-27 13:16:14 C 18 14 08.354 +49 44 53.34 V T08
2025-03-27 13:20:21 C 18 14 07.656 +49 45 05.36 V T08
2025-03-27 13:33:22 C 18 14 05.414 +49 45 43.24 V T08
2025-03-27 23:11:16 C 18 12 31.099 +50 12 30.46 Z C23
2025-03-27 23:14:43 C 18 12 30.562 +50 12 41.22 Z C23
2025-03-27 23:26:11 C 18 12 28.680 +50 13 13.69 Z C23
2025-03-27 23:27:19 C 18 12 28.507 +50 13 16.86 Z C23
2025-03-29 11:08:41 C 18 06 30.178 +51 50 46.72 V T05
2025-03-29 11:29:26 C 18 06 26.532 +51 51 43.52 V T05
2025-03-29 13:51:47 C 18 06 00.953 +51 58 09.44 V T05
2025-03-29 17:58:35 C 18 05 17.60 +52 08 20.9 V M31
2025-03-29 17:59:39 C 18 05 17.42 +52 08 23.6 V M31
2025-03-29 18:00:42 C 18 05 17.25 +52 08 26.7 V M31
2025-03-29 18:01:46 C 18 05 17.09 +52 08 29.6 V M31
2025-03-29 18:02:50 C 18 05 16.90 +52 08 32.1 V M31
2025-03-29 18:03:54 C 18 05 16.74 +52 08 34.8 V M31
2025-03-29 18:04:58 C 18 05 16.53 +52 08 37.6 V M31
2025-03-29 18:06:02 C 18 05 16.34 +52 08 40.6 V M31
2025-03-29 18:07:06 C 18 05 16.18 +52 08 43.6 V M31
2025-03-29 18:08:10 C 18 05 15.99 +52 08 46.3 V M31
2025-03-29 18:09:14 C 18 05 15.83 +52 08 49.2 V M31
2025-03-29 22:04:50 C 18 04 36.024 +52 19 09.98 Z C23
2025-03-29 22:15:42 C 18 04 34.152 +52 19 39.00 Z C23
2025-03-29 22:26:25 C 18 04 32.386 +52 20 07.33 Z C23
2025-03-30 12:48:30 C 18 02 01.358 +52 57 24.84 V T05
2025-03-30 12:56:55 C 18 01 59.784 +52 57 46.73 V T05
2025-03-30 13:09:25 C 18 01 57.442 +52 58 19.78 V T08
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)