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
2008-05-01 21:21:16 C 17 52 40.78 +53 51 39.9 – o 084
2008-05-01 21:25:30 C 17 52 40.39 +53 51 47.0 – o 084
2008-05-01 21:29:44 C 17 52 40.02 +53 51 52.9 – o 084
2008-05-01 21:33:58 C 17 52 39.59 +53 51 59.8 – o 084
2008-05-01 21:38:12 C 17 52 39.22 +53 52 06.6 – o 084
2008-05-01 21:42:25 C 17 52 38.82 +53 52 13.2 – o 084
2008-05-01 21:46:39 C 17 52 38.43 +53 52 19.6 – o 084
2008-05-01 21:51:49 C 17 52 37.94 +53 52 27.8 – o 084
2008-05-01 21:56:03 C 17 52 37.54 +53 52 34.6 – o 084
2008-05-01 22:00:17 C 17 52 37.14 +53 52 40.7 – o 084
2008-05-01 22:04:30 C 17 52 36.72 +53 52 47.8 – o 084
2008-05-01 22:08:44 C 17 52 36.37 +53 52 54.2 – o 084
2008-05-01 22:12:57 C 17 52 35.93 +53 53 01.2 – o 084
2008-05-01 22:17:11 C 17 52 35.56 +53 53 07.5 – o 084
2008-05-01 22:21:25 C 17 52 35.16 +53 53 14.4 – o 084
2008-05-01 22:42:33 C 17 52 33.16 +53 53 47.3 – o 084
2008-05-01 22:46:46 C 17 52 32.76 +53 53 53.9 – o 084
2008-05-01 22:51:00 C 17 52 32.37 +53 54 00.5 – o 084
2008-05-01 22:55:13 C 17 52 31.95 +53 54 07.3 – o 084
2008-05-01 22:59:27 C 17 52 31.55 +53 54 13.9 – o 084
2008-05-01 23:03:41 C 17 52 31.18 +53 54 20.1 – o 084
2008-05-01 23:07:54 C 17 52 30.75 +53 54 26.8 – o 084
2008-05-01 23:12:08 C 17 52 30.36 +53 54 33.6 – o 084
2008-05-01 23:17:54 C 17 52 29.80 +53 54 42.3 – o 084
2008-05-01 23:22:08 C 17 52 29.40 +53 54 49.1 – o 084
2008-05-01 23:26:21 C 17 52 29.00 +53 54 55.6 – o 084
2008-05-01 23:30:35 C 17 52 28.59 +53 55 02.3 – o 084
2008-05-01 23:34:48 C 17 52 28.21 +53 55 08.6 – o 084
2008-05-01 23:39:02 C 17 52 27.77 +53 55 15.4 – o 084
2008-05-01 23:43:16 C 17 52 27.38 +53 55 21.9 – o 084
2008-05-01 23:47:30 C 17 52 26.99 +53 55 28.3 – o 084
2008-05-01 23:51:44 C 17 52 26.57 +53 55 35.1 – o 084
2008-05-01 23:55:58 C 17 52 26.16 +53 55 41.7 – o 084
2008-05-02 00:00:12 C 17 52 25.75 +53 55 48.2 – o 084
2008-05-02 00:04:26 C 17 52 25.37 +53 55 54.8 – o 084
2008-05-02 00:08:39 C 17 52 24.97 +53 56 01.3 – o 084
2008-05-02 00:12:53 C 17 52 24.56 +53 56 07.8 – o 084
2008-05-02 00:17:07 C 17 52 24.15 +53 56 14.4 – o 084
2008-05-02 00:21:20 C 17 52 23.74 +53 56 20.8 – o 084
2008-05-02 00:25:34 C 17 52 23.30 +53 56 27.7 – o 084
2008-05-02 00:29:48 C 17 52 22.92 +53 56 34.1 – o 084
2008-05-02 00:39:57 C 17 52 21.96 +53 56 50.0 – o 084
2008-05-02 00:44:11 C 17 52 21.55 +53 56 56.4 – o 084
2008-05-02 02:52:53 C 17 52 09.71 +54 00 20.1 – c B19
2008-05-02 02:55:09 C 17 52 09.49 +54 00 23.5 – c B19
2008-05-02 02:57:02 C 17 52 09.27 +54 00 26.6 – c B19
2008-05-02 23:13:42 C 17 50 14.94 +54 31 14.1 – o 084
2008-05-02 23:32:22 C 17 50 13.05 +54 31 42.7 – o 084
2008-05-02 23:49:24 C 17 50 11.35 +54 32 08.5 – o 084
2008-05-03 23:07:13 C 17 47 52.59 +55 06 54.7 – o 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)