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
2019-06-24 06:11:11 C 12 13 41.74 +36 18 11.3 V T08
2019-06-24 06:16:30 C 12 13 42.16 +36 18 06.0 V T08
2019-06-24 06:26:30 C 12 13 42.98 +36 17 56.1 V T08
2019-06-24 06:41:52 C 12 13 44.23 +36 17 40.8 V T08
2019-06-25 04:32:49 C 12 15 33.56 +35 56 13.0 V 703
2019-06-25 04:40:59 C 12 15 34.21 +35 56 04.9 V 703
2019-06-25 04:49:08 C 12 15 34.88 +35 55 56.7 V 703
2019-06-25 04:57:17 C 12 15 35.54 +35 55 48.6 V 703
2019-06-25 20:12:35 C 12 16 51.76 +35 40 50.4 q 160
2019-06-25 20:15:29 C 12 16 52.02 +35 40 47.5 q 160
2019-06-25 20:18:25 C 12 16 52.27 +35 40 44.6 q 160
2019-06-26 06:03:37 C 12 17 40.87 +35 31 15.0 V T05
2019-06-26 06:08:55 C 12 17 41.30 +35 31 09.9 V T05
2019-06-26 06:16:50 C 12 17 41.92 +35 31 02.1 V T05
2019-06-26 06:31:34 C 12 17 43.10 +35 30 47.1 V T05
2019-07-01 04:20:42 C 12 27 22.44 +33 35 06.6 V 703
2019-07-01 04:28:49 C 12 27 23.08 +33 34 58.5 V 703
2019-07-01 04:36:55 C 12 27 23.74 +33 34 50.5 V 703
2019-07-01 04:45:02 C 12 27 24.39 +33 34 42.5 V 703
2019-07-01 07:27:23 C 12 27 37.54 +33 32 05.0 V T08
2019-07-01 07:32:02 C 12 27 37.90 +33 32 00.3 V T08
2019-07-01 07:40:13 C 12 27 38.55 +33 31 52.1 V T08
2019-07-01 07:54:37 C 12 27 39.70 +33 31 37.6 V T08
2019-07-02 19:48:27 C 12 30 34.40 +32 56 17.8 q 160
2019-07-02 19:51:23 C 12 30 34.50 +32 56 15.3 q 160
2019-07-02 19:55:22 C 12 30 34.85 +32 56 11.1 q 160
2019-07-03 06:45:46 C 12 31 27.32 +32 45 34.4 V T05
2019-07-03 06:50:31 C 12 31 27.69 +32 45 29.5 V T05
2019-07-03 06:59:16 C 12 31 28.38 +32 45 20.8 V T05
2019-07-03 20:45:41 C 12 32 35.09 +32 31 45.0 c J19
2019-07-03 20:51:51 C 12 32 35.57 +32 31 38.5 c J19
2019-07-03 20:58:01 C 12 32 36.06 +32 31 32.8 c J19
2019-07-03 21:04:12 C 12 32 36.57 +32 31 26.3 c J19
2019-07-03 21:10:23 C 12 32 37.07 +32 31 20.2 c J19
2019-07-03 21:16:35 C 12 32 37.53 +32 31 14.2 c J19
2019-07-03 21:22:44 C 12 32 38.03 +32 31 07.9 c J19
2019-07-07 06:17:23 C 12 39 07.36 +31 11 26.5 V T08
2019-07-07 06:31:41 C 12 39 08.48 +31 11 12.2 V T08
2019-07-07 06:38:19 C 12 39 08.98 +31 11 05.6 V T08
2019-07-07 06:45:58 C 12 39 09.58 +31 10 57.7 V T08
2019-07-09 05:24:53 C 12 42 52.62 +30 24 49.8 V 703
2019-07-09 05:30:05 C 12 42 52.95 +30 24 44.6 V 703
2019-07-09 05:35:17 C 12 42 53.34 +30 24 39.7 V 703
2019-07-09 05:40:29 C 12 42 53.78 +30 24 33.9 V 703
2019-07-10 20:04:11 C 12 45 56.86 +29 46 34.0 q 160
2019-07-10 20:07:07 C 12 45 57.10 +29 46 31.1 q 160
2019-07-10 20:10:03 C 12 45 57.35 +29 46 28.3 q 160
2019-07-12 02:55:55 C 12 48 23.49 +29 15 58.1 q W19
2019-07-12 03:01:24 C 12 48 23.93 +29 15 52.5 q W19
2019-07-12 03:07:41 C 12 48 24.41 +29 15 45.9 q W19
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)