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
2017-06-07 00:40:28 C 23 34 14.93 +46 19 18.4 q 089
2017-06-07 00:44:10 C 23 34 16.13 +46 19 21.4 q 089
2017-06-07 00:47:01 C 23 34 17.04 +46 19 23.7 q 089
2017-06-10 07:52:20 C 00 01 13.05 +47 08 54.8 q W33
2017-06-10 08:07:23 C 00 01 18.43 +47 09 02.3 q W33
2019-03-28 05:44:34 C 03 31 19.93 +40 29 34.7 V T08
2019-03-28 05:46:34 C 03 31 20.66 +40 29 44.5 V T08
2019-03-28 05:52:47 C 03 31 22.99 +40 30 14.8 V T08
2019-03-29 12:22:01 C 03 43 14.59 +42 57 04.0 o D54
2019-03-29 12:28:46 C 03 43 17.32 +42 57 35.4 o D54
2019-03-30 05:38:57 C 03 50 14.54 +44 17 30.2 V T05
2019-03-30 05:48:28 C 03 50 18.40 +44 18 13.0 V T05
2019-03-30 06:01:28 C 03 50 23.66 +44 19 11.4 V T05
2019-04-01 20:40:29 C 04 17 28.96 +48 45 38.9 V Z80
2019-04-01 20:41:18 C 04 17 29.37 +48 45 42.5 V Z80
2019-04-01 20:42:13 C 04 17 29.78 +48 45 45.8 V Z80
2019-04-01 20:43:58 C 04 17 30.61 +48 45 53.0 V Z80
2019-04-01 20:44:56 C 04 17 30.99 +48 45 56.1 V Z80
2019-04-01 20:46:59 C 04 17 31.90 +48 46 04.2 V Z80
2019-04-01 20:47:55 C 04 17 32.34 +48 46 08.1 V Z80
2019-04-01 20:48:42 C 04 17 32.67 +48 46 11.2 V Z80
2019-04-01 20:49:32 C 04 17 33.03 +48 46 14.4 V Z80
2019-04-01 20:50:23 C 04 17 33.43 +48 46 17.4 V Z80
2019-04-03 06:14:03 C 04 33 01.62 +50 51 50.6 V T05
2019-04-03 06:30:09 C 04 33 09.15 +50 52 46.7 V T05
2019-04-03 06:45:48 C 04 33 16.49 +50 53 41.3 V T05
2019-04-03 07:01:30 C 04 33 23.87 +50 54 35.9 V T05
2019-04-05 06:18:03 C 04 56 26.43 +53 29 55.7 V T08
2019-04-05 06:33:00 C 04 56 33.80 +53 30 39.5 V T08
2019-04-05 06:34:20 C 04 56 34.45 +53 30 43.4 V T08
2019-04-05 06:48:26 C 04 56 41.43 +53 31 24.7 V T08
2019-04-05 06:49:05 C 04 56 41.77 +53 31 26.6 V T08
2019-04-05 07:01:10 C 04 56 47.73 +53 32 01.9 V T08
2019-04-05 07:14:32 C 04 56 54.36 +53 32 40.9 V T08
2019-04-07 02:53:06 C 05 19 08.37 +55 32 19.7 V 703
2019-04-07 03:00:56 C 05 19 12.32 +55 32 37.6 V 703
2019-04-07 03:08:44 C 05 19 16.35 +55 32 57.5 V 703
2019-04-07 03:16:33 C 05 19 20.34 +55 33 15.4 V 703
2019-04-07 06:45:39 C 05 21 08.24 +55 41 52.6 V T05
2019-04-07 06:46:59 C 05 21 08.79 +55 41 55.4 V T05
2019-04-07 07:00:34 C 05 21 15.86 +55 42 27.9 V T05
2019-04-07 07:16:31 C 05 21 24.06 +55 43 05.5 V T05
2019-04-07 07:17:52 C 05 21 24.66 +55 43 08.3 V T05
2019-04-07 07:31:44 C 05 21 31.87 +55 43 41.2 V T05
2019-04-09 06:41:03 C 05 46 14.80 +57 25 36.9 V T08
2019-04-09 06:53:49 C 05 46 21.45 +57 26 00.2 V T08
2019-04-09 07:07:21 C 05 46 28.50 +57 26 24.8 V T08
2019-04-09 07:20:47 C 05 46 35.52 +57 26 49.0 V T08
2019-04-11 02:58:37 C 06 09 39.53 +58 38 52.4 V 703
2019-04-11 03:06:30 C 06 09 43.65 +58 39 03.2 V 703
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)