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
2005-08-01 20:08:20 C 13 24 11.38 +29 26 41.9 r A30
2005-08-01 20:09:13 C 13 24 11.37 +29 26 40.6 r A30
2005-08-01 20:10:18 C 13 24 11.36 +29 26 39.1 r A30
2005-08-01 21:06:02 C 13 24 11.08 +29 25 14.7 r 084
2005-08-01 21:08:09 C 13 24 11.12 +29 25 11.5 r 084
2005-08-08 20:56:31 C 13 21 40.73 +25 15 00.7 r 084
2005-08-08 20:58:38 C 13 21 40.69 +25 14 57.6 r 084
2005-08-17 19:37:51 C 13 12 44.67 +19 15 56.8 c 113
2005-08-17 19:39:30 C 13 12 44.52 +19 15 53.9 c 113
2005-08-17 19:41:08 C 13 12 44.44 +19 15 51.3 c 113
2006-04-09 11:37:20 C 21 16 52.68 +07 42 03.4 r 703
2006-04-09 11:43:40 C 21 16 53.72 +07 42 07.0 r 703
2006-04-09 11:49:55 C 21 16 54.76 +07 42 10.8 r 703
2006-04-09 11:56:11 C 21 16 55.88 +07 42 15.1 r 703
2007-05-20 19:50:35 C 07 32 59.73 +29 03 11.6 o B38
2007-05-20 20:13:08 C 07 33 05.36 +29 03 21.7 o B38
2007-05-20 20:40:16 C 07 33 12.23 +29 03 32.8 o B38
2007-05-21 20:07:23 C 07 39 04.69 +29 13 29.5 o B38
2007-05-21 21:11:20 C 07 39 20.58 +29 13 55.5 o B38
2007-05-24 03:20:00 C 07 52 40.26 +29 32 55.8 r 703
2007-05-24 03:25:50 C 07 52 41.70 +29 32 57.9 r 703
2007-05-24 03:31:40 C 07 52 43.06 +29 32 59.2 r 703
2007-05-24 03:37:28 C 07 52 44.47 +29 33 00.9 r 703
2007-06-05 03:35:00 C 08 57 49.96 +29 55 30.9 r 703
2007-06-05 03:38:06 C 08 57 50.61 +29 55 30.9 r 703
2007-06-05 03:41:14 C 08 57 51.33 +29 55 30.1 r 703
2007-06-05 03:44:23 C 08 57 51.94 +29 55 29.7 r 703
2007-06-24 03:40:30 C 10 21 47.70 +27 26 57.1 r 703
2007-06-24 03:48:18 C 10 21 48.99 +27 26 53.9 r 703
2007-06-24 03:56:08 C 10 21 50.25 +27 26 49.5 r 703
2007-06-24 04:03:59 C 10 21 51.55 +27 26 46.1 r 703
2007-07-15 02:24:05 C 11 34 18.93 +22 34 44.3 r H45
2007-07-15 02:25:56 C 11 34 19.13 +22 34 43.5 r H45
2007-07-15 02:27:48 C 11 34 19.37 +22 34 42.0 r H45
2007-07-15 02:29:21 C 11 34 19.60 +22 34 41.3 r H45
2007-07-15 02:30:34 C 11 34 19.76 +22 34 40.2 r H45
2008-03-01 04:35:03 C 17 48 47.98 +05 08 46.8 c B37
2008-03-01 04:36:01 C 17 48 48.00 +05 08 49.6 c B37
2008-03-01 04:37:20 C 17 48 48.07 +05 08 51.1 c B37
2008-03-01 04:37:48 C 17 48 48.08 +05 08 53.1 c B37
2008-03-01 04:38:40 C 17 48 48.10 +05 08 55.0 c B37
2008-03-01 04:39:34 C 17 48 48.17 +05 08 56.4 c B37
2008-03-01 04:41:20 C 17 48 48.22 +05 08 59.8 c B37
2008-03-01 04:42:04 C 17 48 48.24 +05 09 02.0 c B37
2008-03-01 04:44:16 C 17 48 48.32 +05 09 06.9 c B37
2008-03-06 03:01:44 C 17 54 06.95 +09 17 28.5 r 084
2008-03-06 03:04:58 C 17 54 07.08 +09 17 35.0 r 084
2008-03-25 01:02:37 C 18 10 57.45 +25 03 41.2 r 084
2008-03-25 01:45:14 C 18 10 58.49 +25 05 09.7 r 084
2008-03-25 01:48:52 C 18 10 58.59 +25 05 17.3 r 084
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)