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
2008-05-03 23:48:26 C 17 47 48.18 +55 07 56.3 o 084
2008-05-04 00:24:27 C 17 47 44.38 +55 08 49.4 o 084
2008-05-04 20:33:50 C 17 45 38.32 +55 38 13.7 r 168
2008-05-04 20:34:49 C 17 45 38.20 +55 38 15.4 r 168
2008-05-04 20:35:50 C 17 45 38.11 +55 38 17.1 r 168
2008-05-04 20:36:50 C 17 45 37.95 +55 38 18.4 r 168
2008-05-04 20:38:29 C 17 45 37.74 +55 38 21.0 r 168
2008-05-04 20:39:29 C 17 45 37.68 +55 38 22.2 r 168
2008-05-04 21:03:10 C 17 45 35.01 +55 38 56.4 r 168
2008-05-04 21:04:10 C 17 45 34.84 +55 38 57.7 r 168
2008-05-04 21:04:20 C 17 45 34.76 +55 38 58.8 r 168
2008-05-04 21:06:00 C 17 45 34.67 +55 39 00.2 r 168
2008-05-04 21:08:59 C 17 45 34.38 +55 39 04.7 r 168
2008-05-04 21:10:00 C 17 45 34.30 +55 39 06.1 r 168
2008-05-04 21:11:00 C 17 45 34.16 +55 39 08.3 r 168
2008-05-04 21:13:00 C 17 45 33.95 +55 39 11.2 r 168
2008-05-04 21:40:10 C 17 45 30.90 +55 39 50.8 r 168
2008-05-04 21:42:10 C 17 45 30.69 +55 39 53.7 r 168
2008-05-04 21:43:11 C 17 45 30.57 +55 39 55.2 r 168
2008-05-04 21:44:09 C 17 45 30.46 +55 39 56.7 r 168
2008-05-04 21:45:10 C 17 45 30.34 +55 39 58.1 r 168
2008-05-04 21:46:09 C 17 45 30.22 +55 39 59.4 r 168
2008-05-04 21:47:15 C 17 45 30.11 +55 40 01.1 r 168
2008-05-04 21:48:15 C 17 45 30.00 +55 40 02.6 r 168
2008-05-04 21:49:10 C 17 45 29.90 +55 40 03.9 r 168
2008-05-04 21:50:10 C 17 45 29.78 +55 40 05.4 r 168
2008-05-05 07:50:21 C 17 44 24.91 +55 54 33.2 r H45
2008-05-05 07:52:03 C 17 44 24.71 +55 54 35.5 r H45
2008-05-05 07:54:16 C 17 44 24.46 +55 54 38.8 r H45
2008-05-05 07:56:57 C 17 44 24.13 +55 54 42.6 r H45
2008-05-05 07:58:45 C 17 44 23.93 +55 54 45.1 r H45
2008-05-08 05:17:00 C 17 36 14.38 +57 29 47.8 o H51
2008-05-08 05:17:49 C 17 36 14.28 +57 29 48.8 o H51
2008-05-08 05:18:36 C 17 36 14.17 +57 29 49.9 o H51
2008-05-08 05:19:26 C 17 36 14.06 +57 29 50.8 o H51
2008-05-08 05:20:15 C 17 36 13.98 +57 29 52.1 o H51
2008-05-08 05:21:02 C 17 36 13.87 +57 29 53.2 o H51
2008-05-08 05:21:52 C 17 36 13.75 +57 29 54.3 o H51
2008-05-08 05:22:39 C 17 36 13.67 +57 29 55.1 o H51
2008-05-08 05:23:28 C 17 36 13.56 +57 29 56.5 o H51
2008-05-08 05:24:17 C 17 36 13.45 +57 29 57.5 o H51
2008-05-10 22:50:06 C 17 27 26.67 +58 52 17.8 o A74
2008-05-10 23:12:58 C 17 27 23.31 +58 52 45.9 o A74
2008-05-10 23:35:51 C 17 27 19.93 +58 53 13.8 o A74
2008-05-11 00:00:47 C 17 27 16.24 +58 53 44.2 o A74
2008-05-11 00:27:49 C 17 27 12.24 +58 54 16.9 o A74
2008-05-11 00:53:47 C 17 27 08.36 +58 54 48.3 o A74
2008-05-11 01:19:47 C 17 27 04.51 +58 55 19.5 o A74
2008-05-11 01:43:42 C 17 27 00.95 +58 55 48.0 o A74
2008-05-11 02:09:41 C 17 26 57.07 +58 56 19.1 o A74
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)