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
1999-04-28 20:58:45 C 10 02 45.55 +63 02 32.1 d 046
1999-04-28 21:13:25 C 10 02 48.57 +63 02 12.4 b 118
1999-04-28 21:18:30 C 10 02 49.69 +63 02 05.7 b 118
1999-04-28 21:20:26 C 10 02 50.13 +63 02 03.1 b 118
1999-04-28 21:32:44 C 10 02 53.16 +63 01 46.6 c 636
1999-04-28 21:45:10 C 10 02 55.93 +63 01 29.9 c 636
1999-04-28 21:58:14 C 10 02 58.80 +63 01 12.8 c 636
1999-04-29 05:25:34 C 10 04 38.17 +62 51 39.3 c 699
1999-04-29 05:47:32 C 10 04 42.84 +62 51 10.0 c 699
1999-04-29 06:09:34 C 10 04 47.58 +62 50 40.4 c 699
1999-04-29 06:17:03 C 10 04 49.86 +62 50 27.6 658
1999-04-29 06:21:29 C 10 04 50.94 +62 50 21.8 658
1999-04-29 06:25:31 C 10 04 51.74 +62 50 16.4 658
1999-04-29 20:39:16 C 10 07 56.78 +62 31 52.0 d 046
1999-04-29 20:41:20 C 10 07 57.21 +62 31 49.3 d 046
1999-04-29 20:42:49 C 10 07 57.50 +62 31 47.3 d 046
1999-04-29 20:45:49 C 10 07 58.13 +62 31 43.3 d 046
1999-04-29 20:56:39 C 10 08 00.33 +62 31 28.8 b 118
1999-04-29 21:01:42 C 10 08 01.37 +62 31 22.1 b 118
1999-04-29 21:05:24 C 10 08 02.14 +62 31 17.1 b 118
1999-04-29 23:42:10 C 10 08 35.02 +62 27 49.4 c 636
1999-04-29 23:55:30 C 10 08 37.83 +62 27 32.0 c 636
1999-04-30 00:10:29 C 10 08 40.93 +62 27 11.5 c 636
1999-04-30 00:15:29 C 10 08 42.01 +62 27 04.8 c 636
1999-04-30 02:55:41 C 10 09 16.89 +62 23 46.7 i 726
1999-04-30 03:00:42 C 10 09 17.90 +62 23 40.2 i 726
1999-04-30 03:05:42 C 10 09 18.92 +62 23 33.8 i 726
1999-04-30 03:10:41 C 10 09 19.91 +62 23 27.5 i 726
1999-04-30 03:20:42 C 10 09 21.94 +62 23 13.9 i 726
1999-04-30 11:25:15 C 10 11 02.76 +62 12 51.2 z 402
1999-04-30 11:27:04 C 10 11 03.11 +62 12 48.9 z 402
1999-04-30 11:28:53 C 10 11 03.48 +62 12 46.6 z 402
1999-04-30 19:31:54 C 10 12 42.24 +62 02 20.2 z 151
1999-04-30 19:37:56 C 10 12 43.40 +62 02 12.4 z 151
1999-04-30 19:42:16 C 10 12 44.28 +62 02 06.4 z 151
1999-04-30 19:46:13 C 10 12 45.05 +62 02 01.3 z 151
1999-04-30 19:57:04 C 10 12 47.14 +62 01 47.2 z 151
1999-04-30 19:59:02 C 10 12 47.58 +62 01 44.9 z 151
1999-04-30 21:22:34 C 10 13 03.88 +61 59 55.5 c 636
1999-04-30 21:26:15 C 10 13 04.60 +61 59 50.6 c 636
1999-04-30 21:29:34 C 10 13 05.26 +61 59 46.2 c 636
1999-04-30 21:32:44 C 10 13 05.89 +61 59 42.0 c 636
1999-05-01 03:41:40 C 10 14 19.77 +61 51 48.0 i 726
1999-05-01 03:46:40 C 10 14 20.74 +61 51 40.7 i 726
1999-05-01 03:51:40 C 10 14 21.69 +61 51 35.2 i 726
1999-05-01 03:56:39 C 10 14 22.63 +61 51 27.8 i 726
1999-05-01 04:01:39 C 10 14 23.59 +61 51 21.1 i 726
1999-05-01 04:06:40 C 10 14 24.58 +61 51 15.0 i 726
1999-05-01 12:49:39 C 10 16 07.20 +61 40 05.5 z 900
1999-05-01 13:02:58 C 10 16 09.70 +61 39 48.1 z 900
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)