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
2020-05-11 19:49:08 C 22 04 50.67 +26 58 31.7 – q D29
2020-05-13 10:38:52 C 22 12 27.18 +27 34 43.5 – V 703
2020-05-13 10:46:25 C 22 12 28.67 +27 34 50.6 – V 703
2020-05-13 10:54:00 C 22 12 30.19 +27 34 57.7 – V 703
2020-05-13 11:01:35 C 22 12 31.64 +27 35 04.7 – V 703
2020-05-16 10:00:33 C 22 27 06.02 +28 39 04.2 – V 703
2020-05-16 10:08:09 C 22 27 07.71 +28 39 12.5 – V 703
2020-05-16 10:15:46 C 22 27 09.25 +28 39 18.3 – V 703
2020-05-16 10:23:23 C 22 27 10.83 +28 39 25.1 – V 703
2020-05-20 09:58:26 C 22 48 16.58 +29 59 40.4 – V 703
2020-05-20 10:05:57 C 22 48 18.28 +29 59 46.4 – V 703
2020-05-20 10:13:30 C 22 48 20.01 +29 59 52.5 – V 703
2020-05-20 10:21:03 C 22 48 21.72 +29 59 58.9 – V 703
2020-05-20 13:59:25 C 22 49 12.05 +30 02 55.6 – V T08
2020-05-20 14:06:48 C 22 49 13.74 +30 03 01.7 – V T08
2020-05-20 14:26:09 C 22 49 18.14 +30 03 17.3 – V T08
2020-05-20 14:38:06 C 22 49 20.87 +30 03 27.0 – V T08
2020-05-24 10:22:12 C 23 11 24.86 +31 11 06.4 – V 703
2020-05-24 10:36:13 C 23 11 28.37 +31 11 16.4 – V 703
2020-05-24 10:43:14 C 23 11 30.07 +31 11 21.0 – V 703
2020-05-25 02:52:18 C 23 15 34.29 +31 22 05.7 – V 160
2020-05-25 02:54:36 C 23 15 34.87 +31 22 07.1 – V 160
2020-05-25 02:56:22 C 23 15 35.32 +31 22 09.1 – V 160
2020-05-26 02:44:36 C 23 21 41.58 +31 37 19.5 – V 160
2020-05-26 02:47:36 C 23 21 42.36 +31 37 21.4 – V 160
2020-05-26 02:50:15 C 23 21 43.04 +31 37 23.1 – V 160
2020-05-28 10:45:04 C 23 36 33.08 +32 09 26.4 – V 703
2020-05-28 10:52:41 C 23 36 35.14 +32 09 30.4 – V 703
2020-05-28 11:00:20 C 23 36 37.20 +32 09 34.6 – V 703
2020-05-28 11:07:58 C 23 36 39.25 +32 09 38.7 – V 703
2020-05-28 13:42:00 C 23 37 21.27 +32 11 01.0 – V T08
2020-05-28 13:53:14 C 23 37 24.30 +32 11 07.1 – V T08
2020-05-28 14:15:53 C 23 37 30.41 +32 11 19.4 – V T08
2020-05-28 14:29:52 C 23 37 34.17 +32 11 27.0 – V T08
2020-05-30 14:15:25 C 23 50 49.53 +32 33 54.4 – V T05
2020-05-30 14:30:55 C 23 50 53.88 +32 34 01.4 – V T05
2020-05-30 14:40:14 C 23 50 56.47 +32 34 05.4 – V T05
2020-05-30 14:51:19 C 23 50 59.59 +32 34 10.3 – V T05
2020-05-31 09:38:26 C 23 56 20.95 +32 41 37.0 – V 703
2020-05-31 09:44:13 C 23 56 22.57 +32 41 39.6 – V 703
2020-05-31 09:49:59 C 23 56 24.26 +32 41 41.8 – V 703
2020-06-02 04:05:13 C 00 08 43.33 +32 55 48.3 – o Z22
2020-06-02 05:12:31 C 00 09 03.15 +32 56 08.6 – o Z22
2020-06-04 10:44:14 C 00 25 12.02 +33 07 40.9 – V 703
2020-06-04 10:50:32 C 00 25 13.94 +33 07 41.8 – V 703
2020-06-04 10:56:49 C 00 25 15.86 +33 07 43.2 – V 703
2020-06-04 11:03:08 C 00 25 17.77 +33 07 44.1 – V 703
2020-06-09 10:49:10 C 01 03 19.11 +33 05 35.8 – V 703
2020-06-09 10:54:56 C 01 03 20.98 +33 05 34.8 – V 703
2020-06-09 11:00:42 C 01 03 22.82 +33 05 34.3 – V 703
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)