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
2020-06-09 11:06:28 C 01 03 24.72 +33 05 33.0 V 703
2020-06-12 10:40:39 C 01 27 06.11 +32 44 04.2 V 703
2020-06-12 10:49:16 C 01 27 09.00 +32 44 01.4 V 703
2020-06-12 10:57:52 C 01 27 11.86 +32 43 57.8 V 703
2020-06-12 11:06:29 C 01 27 14.72 +32 43 54.3 V 703
2021-06-21 04:05:26 C 08 50 01.50 +23 28 31.4 U I41
2021-06-21 04:08:51 C 08 50 02.22 +23 28 30.9 U I41
2021-06-21 04:12:19 C 08 50 02.95 +23 28 30.6 U I41
2021-06-21 04:15:44 C 08 50 03.66 +23 28 30.2 U I41
2021-06-21 04:19:11 C 08 50 04.40 +23 28 30.0 U I41
2021-06-27 04:06:10 C 09 19 24.98 +23 06 28.3 U I41
2021-06-27 04:09:40 C 09 19 25.67 +23 06 27.5 U I41
2021-06-27 04:16:39 C 09 19 27.04 +23 06 26.0 U I41
2021-06-27 04:20:08 C 09 19 27.71 +23 06 25.1 U I41
2021-07-30 05:51:53 C 11 30 11.38 +17 22 58.1 V T08
2021-07-30 06:23:06 C 11 30 15.74 +17 22 39.4 V T08
2021-07-30 06:25:45 C 11 30 16.13 +17 22 38.1 V T08
2022-03-18 18:48:21 C 23 41 03.18 +50 46 23.7 V C23
2022-03-18 18:54:31 C 23 41 03.18 +50 47 15.5 V C23
2022-03-18 18:58:37 C 23 41 03.17 +50 47 50.3 V C23
2022-03-19 18:42:28 C 23 41 01.94 +54 06 33.0 V C23
2022-03-19 18:47:00 C 23 41 01.95 +54 07 09.7 V C23
2022-03-19 18:52:45 C 23 41 02.00 +54 07 56.3 V C23
2022-03-21 01:06:22 C 23 41 06.76 +58 10 52.7 V L65
2022-03-21 01:21:42 C 23 41 06.94 +58 12 52.8 V L65
2022-03-21 01:59:12 C 23 41 07.44 +58 17 48.9 V L65
2022-03-22 01:03:24 C 23 41 08.30 +61 14 46.7 V L65
2022-03-22 01:20:14 C 23 41 08.54 +61 16 54.0 V L65
2022-03-22 01:28:42 C 23 41 08.72 +61 17 57.5 V L65
2022-03-23 01:03:01 C 23 41 11.66 +64 10 45.3 V L65
2022-03-23 01:16:10 C 23 41 11.92 +64 12 20.3 V L65
2022-03-23 01:29:39 C 23 41 12.13 +64 13 57.4 V L65
2022-03-24 01:03:58 C 23 41 17.38 +66 58 24.2 V L65
2022-03-24 01:14:52 C 23 41 17.64 +66 59 38.7 V L65
2022-03-24 01:29:47 C 23 41 17.93 +67 01 21.0 V L65
2022-03-24 16:13:40 C 23 41 16.80 +68 39 55.5 q 168
2022-03-24 16:29:31 C 23 41 17.12 +68 41 38.4 q 168
2022-03-24 17:17:30 C 23 41 18.08 +68 46 50.9 q 168
2022-03-24 18:17:29 C 23 41 19.44 +68 53 21.5 q 168
2022-03-24 18:29:31 C 23 41 19.73 +68 54 39.2 q 168
2022-03-25 00:02:26 C 23 41 24.52 +69 30 43.7 V L65
2022-03-25 00:20:00 C 23 41 25.02 +69 32 37.6 V L65
2022-03-25 00:29:41 C 23 41 25.31 +69 33 40.5 V L65
2022-03-25 16:51:55 C 23 41 28.26 +71 17 30.1 q 168
2022-03-25 17:52:12 C 23 41 29.84 +71 23 41.4 q 168
2022-03-25 18:53:12 C 23 41 31.60 +71 29 57.7 q 168
2022-03-26 00:02:09 C 23 41 36.99 +72 01 38.0 V L65
2022-03-26 00:17:18 C 23 41 37.46 +72 03 11.0 V L65
2022-03-26 00:29:35 C 23 41 37.87 +72 04 26.5 V L65
2022-03-26 02:54:31 C 23 41 41.96 +72 19 17.9 V C23
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)