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
2022-03-26 02:59:44 C 23 41 42.11 +72 19 50.1 V C23
2022-03-26 03:04:21 C 23 41 42.20 +72 20 18.5 V C23
2022-03-27 00:18:06 C 23 41 55.28 +74 25 55.0 V L65
2022-03-27 00:21:19 C 23 41 55.36 +74 26 13.5 V L65
2022-03-27 00:22:15 C 23 41 55.36 +74 26 19.0 V L65
2022-04-03 02:48:42 C 00 00 55.99 +87 56 03.4 V C23
2022-04-03 02:54:04 C 00 01 00.05 +87 56 24.5 V C23
2022-04-03 02:58:10 C 00 01 03.26 +87 56 40.7 V C23
2022-04-06 22:19:42 C 11 25 41.57 +86 41 12.0 V A92
2022-04-06 22:50:04 C 11 25 45.76 +86 39 33.8 V A92
2022-04-06 23:19:01 C 11 25 49.57 +86 38 00.1 V A92
2022-04-06 23:34:11 C 11 25 51.32 +86 37 10.5 V A92
2022-04-07 17:24:40 C 11 29 07.00 +85 41 23.1 q 168
2022-04-07 18:03:28 C 11 29 09.58 +85 39 24.6 q 168
2022-04-07 18:54:47 C 11 29 12.77 +85 36 47.0 q 168
2022-04-07 19:40:28 C 11 29 15.64 +85 34 26.5 q 168
2022-04-07 21:09:41 C 11 29 35.542 +85 29 55.79 V Z80
2022-04-07 21:13:30 C 11 29 35.770 +85 29 44.56 V Z80
2022-04-07 21:17:10 C 11 29 35.981 +85 29 33.11 V Z80
2022-04-08 21:06:21 C 11 31 46.954 +84 18 29.23 V Z80
2022-04-08 21:10:08 C 11 31 46.999 +84 18 18.29 V Z80
2022-04-08 21:13:58 C 11 31 46.982 +84 18 07.09 V Z80
2022-04-08 21:17:13 C 11 31 47.126 +84 17 58.24 V Z80
2022-04-10 18:11:03 C 11 34 09.17 +82 12 13.8 q 168
2022-04-10 19:18:05 C 11 34 09.75 +82 09 13.3 q 168
2022-04-10 20:31:06 C 11 34 10.61 +82 05 55.7 q 168
2022-04-10 21:41:08 C 11 34 11.77 +82 02 45.3 q 168
2022-04-10 23:00:10 C 11 34 13.71 +81 59 09.9 q 168
2022-04-11 17:17:07 C 11 35 01.74 +81 11 19.3 q 168
2022-04-11 18:32:20 C 11 35 02.15 +81 08 05.6 q 168
2022-04-11 19:49:47 C 11 35 02.68 +81 04 45.0 q 168
2022-04-11 21:01:25 C 11 35 03.40 +81 01 38.4 q 168
2022-04-11 21:49:36 C 11 35 06.35 +80 59 42.3 V 073
2022-04-11 21:55:36 C 11 35 04.22 +80 59 16.9 q 168
2022-04-11 22:31:30 C 11 35 06.43 +80 57 53.4 V 073
2022-04-11 23:13:24 C 11 35 06.57 +80 56 04.2 V 073
2022-04-11 23:54:46 C 11 35 06.89 +80 54 15.9 V 073
2022-04-13 08:47:21 C 11 36 10.052 +79 32 41.54 U F52
2022-04-13 09:02:54 C 11 36 09.857 +79 32 03.71 U F52
2022-04-13 09:18:33 C 11 36 09.687 +79 31 25.50 U F52
2022-04-13 09:34:15 C 11 36 09.513 +79 30 47.26 U F52
2022-04-13 20:36:40 C 11 36 30.310 +79 04 08.87 V K74
2022-04-13 20:38:08 C 11 36 30.305 +79 04 05.56 V K74
2022-04-13 20:41:05 C 11 36 30.276 +79 03 58.57 V K74
2022-04-13 20:44:03 C 11 36 30.322 +79 03 51.55 V K74
2022-04-13 20:46:59 C 11 36 30.288 +79 03 44.86 V K74
2022-04-13 20:49:55 C 11 36 30.274 +79 03 37.91 V K74
2022-04-14 20:32:08 C 11 37 06.33 +78 08 17.0 q B92
2022-04-14 20:53:32 C 11 37 06.32 +78 07 28.4 q B92
2022-04-14 21:14:55 C 11 37 06.35 +78 06 39.7 q B92
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)