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
2002-03-30 01:15:34 C 18 46 56.98 +70 22 02.1 – c 084
2002-03-30 19:52:08 C 18 36 18.05 +71 05 32.3 – c 195
2002-03-30 20:05:04 C 18 36 10.79 +71 06 02.1 – c 195
2002-03-30 20:20:11 C 18 36 02.20 +71 06 37.1 – c 195
2002-03-31 00:44:27 C 18 33 26.61 +71 16 49.9 – c 084
2002-04-01 10:07:55 C 18 13 14.40 +72 24 14.3 15.2 c 704
2002-04-01 10:25:16 C 18 13 03.21 +72 24 46.8 15.2 c 704
2002-04-01 10:42:33 C 18 12 52.11 +72 25 19.0 15.2 c 704
2002-04-01 10:59:51 C 18 12 40.72 +72 25 50.9 15.2 c 704
2002-04-01 11:17:08 C 18 12 29.75 +72 26 22.9 15.2 c 704
2002-04-01 14:56:10 C 18 10 16.49 +72 32 36.1 – c 355
2002-04-01 14:58:01 C 18 10 15.31 +72 32 39.6 – c 355
2002-04-01 15:01:45 C 18 10 12.94 +72 32 46.7 – c 355
2002-04-01 15:05:53 C 18 10 10.36 +72 32 54.4 – c 355
2002-04-01 19:30:29 C 18 07 21.56 +72 40 15.3 – d 557
2002-04-01 20:31:04 C 18 06 44.08 +72 42 03.7 – d 557
2002-04-01 21:31:28 C 18 06 06.36 +72 43 51.8 – d 557
2002-04-01 22:30:12 C 18 05 29.31 +72 45 36.5 – d 557
2002-04-01 23:30:46 C 18 04 50.79 +72 47 23.9 – d 557
2002-04-02 00:31:12 C 18 04 11.93 +72 49 10.0 – d 557
2002-04-02 01:30:44 C 18 03 33.29 +72 50 53.1 – d 557
2002-04-02 02:31:09 C 18 02 53.85 +72 52 36.0 – d 557
2002-04-02 03:31:41 C 18 02 14.11 +72 54 17.2 – d 557
2002-04-02 19:04:48 C 17 52 15.92 +73 17 52.5 – d 557
2002-04-02 19:34:45 C 17 51 56.92 +73 18 38.3 – d 557
2002-04-02 20:04:43 C 17 51 37.81 +73 19 24.2 – d 557
2002-04-02 20:36:26 C 17 51 17.45 +73 20 12.9 – d 557
2002-04-02 21:10:41 C 17 50 55.40 +73 21 05.4 – d 557
2002-04-02 21:39:14 C 17 50 36.93 +73 21 49.0 – d 557
2002-04-02 22:10:41 C 17 50 16.48 +73 22 37.0 – d 557
2002-04-02 22:32:03 C 17 50 02.54 +73 23 09.5 – d 557
2002-04-02 23:13:41 C 17 49 35.21 +73 24 12.5 – d 557
2002-04-02 23:38:19 C 17 49 18.98 +73 24 49.5 – d 557
2002-04-03 00:06:50 C 17 49 00.11 +73 25 32.2 – d 557
2002-04-03 00:36:46 C 17 48 40.24 +73 26 16.7 – d 557
2002-04-03 01:06:43 C 17 48 20.23 +73 27 00.7 – d 557
2002-04-03 01:11:03 C 17 48 17.76 +73 27 06.0 – c 198
2002-04-03 01:14:45 C 17 48 15.34 +73 27 11.6 – c 198
2002-04-03 01:17:30 C 17 48 13.51 +73 27 15.7 – c 198
2002-04-03 01:19:19 C 17 48 12.24 +73 27 18.4 – c 198
2002-04-03 01:34:57 C 17 48 01.33 +73 27 42.0 – d 557
2002-04-03 01:55:46 C 17 47 45.88 +73 28 10.3 – c 084
2002-04-03 02:04:55 C 17 47 41.23 +73 28 25.3 – d 557
2002-04-03 02:33:25 C 17 47 22.07 +73 29 05.9 – d 557
2002-04-03 18:57:40 C 17 36 35.04 +73 49 59.3 – d 557
2002-04-03 19:47:30 C 17 36 02.56 +73 51 03.3 – d 557
2002-04-03 20:30:01 C 17 35 34.73 +73 51 57.9 – d 557
2002-04-03 21:14:17 C 17 35 05.52 +73 52 54.8 – d 557
2002-04-03 21:57:17 C 17 34 36.96 +73 53 49.7 – d 557
2002-04-03 22:49:24 C 17 34 02.10 +73 54 56.0 – d 557
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)