IAA RAS IAA Minor Planet Database

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
1999-06-25 21:15:27 C 12 28 09.84 +37 02 00.5 – d 046
1999-06-28 20:40:38 C 12 33 18.64 +35 48 46.6 – z 151
1999-06-28 20:46:53 C 12 33 19.06 +35 48 38.2 – z 151
1999-06-28 20:51:06 C 12 33 19.39 +35 48 34.0 – z 151
1999-06-28 20:55:14 C 12 33 19.72 +35 48 30.2 – z 151
1999-06-28 21:01:09 C 12 33 20.04 +35 48 23.4 – z 151
1999-06-29 20:37:22 C 12 35 01.89 +35 24 11.9 – c 118
1999-06-29 20:42:57 C 12 35 02.26 +35 24 06.2 – c 118
1999-07-01 20:53:55 C 12 38 29.45 +34 34 40.9 – z 151
1999-07-01 20:59:34 C 12 38 29.86 +34 34 36.1 – z 151
1999-07-01 21:03:46 C 12 38 30.11 +34 34 30.9 – z 151
1999-07-01 21:09:12 C 12 38 30.47 +34 34 25.7 – z 151
1999-07-01 21:12:29 C 12 38 30.74 +34 34 21.8 – z 151
1999-07-01 21:16:03 C 12 38 30.94 +34 34 18.0 – z 151
1999-07-02 20:26:05 C 12 40 10.36 +34 10 31.3 – z 151
1999-07-02 20:36:48 C 12 40 11.04 +34 10 21.3 – z 151
1999-07-02 20:40:35 C 12 40 11.39 +34 10 17.0 – z 151
1999-07-02 20:43:35 C 12 40 11.62 +34 10 13.4 – z 151
1999-07-02 20:47:42 C 12 40 11.79 +34 10 11.0 – z 151
1999-07-11 04:33:29 C 12 54 26.88 +30 44 32.0 – c 846
1999-07-11 04:43:29 C 12 54 27.63 +30 44 21.7 – c 846
1999-07-12 03:31:30 C 12 56 05.20 +30 20 47.8 – c 846
1999-07-12 03:41:30 C 12 56 05.91 +30 20 37.4 – c 846
1999-07-12 03:51:29 C 12 56 06.63 +30 20 27.4 – c 846
1999-07-14 20:43:17 C 13 00 44.51 +29 13 08.4 – z 587
1999-07-14 20:48:58 C 13 00 44.92 +29 13 02.7 – z 587
1999-07-16 20:58:54 C 13 04 11.47 +28 22 53.0 – z 151
1999-07-16 21:02:39 C 13 04 11.72 +28 22 49.1 – z 151
1999-07-16 21:09:04 C 13 04 12.12 +28 22 42.1 – z 151
1999-07-16 21:14:23 C 13 04 12.50 +28 22 36.4 – z 151
1999-07-16 21:16:56 C 13 04 12.67 +28 22 34.1 – z 151
1999-07-18 21:25:10 C 13 07 39.32 +27 32 16.2 – – 595
1999-07-18 21:35:09 C 13 07 40.01 +27 32 05.7 – – 595
1999-07-18 21:46:41 C 13 07 40.84 +27 31 53.7 – – 595
1999-07-24 20:45:01 C 13 17 55.71 +25 01 20.3 – z 151
1999-07-24 20:53:13 C 13 17 56.34 +25 01 10.6 – z 151
1999-07-24 20:55:52 C 13 17 56.54 +25 01 08.3 – z 151
1999-07-24 21:06:38 C 13 17 57.26 +25 00 56.0 – z 151
1999-07-24 21:11:33 C 13 17 57.58 +25 00 50.3 – z 151
1999-07-25 00:01:54 C 13 18 09.82 +24 58 00.2 – z 859
1999-07-25 00:09:48 C 13 18 10.35 +24 57 52.6 – z 859
1999-07-25 00:15:34 C 13 18 10.82 +24 57 45.9 – z 859
1999-07-25 20:31:35 C 13 19 38.24 +24 36 05.3 – c 118
1999-07-25 20:36:27 C 13 19 38.56 +24 36 00.2 – c 118
1999-07-25 20:42:05 C 13 19 39.00 +24 35 54.1 – c 118
1999-07-25 21:10:09 C 13 19 41.03 +24 35 24.8 – z 151
1999-07-25 21:18:25 C 13 19 41.56 +24 35 16.4 – z 151
1999-07-25 21:28:18 C 13 19 42.23 +24 35 05.1 – z 151
1999-07-25 21:35:42 C 13 19 42.75 +24 34 56.6 – z 151
1999-07-26 20:40:34 C 13 21 22.26 +24 10 22.4 – z 151
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)