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
2008-04-27 20:30:45 C 18 00 29.03 +51 16 08.8 – d 557
2008-04-27 20:30:57 C 18 00 28.74 +51 16 09.4 – o 084
2008-04-27 20:35:50 C 18 00 28.36 +51 16 18.1 – o 084
2008-04-27 20:40:04 C 18 00 28.09 +51 16 24.8 – o 084
2008-04-27 20:44:17 C 18 00 27.78 +51 16 32.3 – o 084
2008-04-27 20:48:31 C 18 00 27.52 +51 16 39.1 – o 084
2008-04-27 20:52:45 C 18 00 27.20 +51 16 46.4 – o 084
2008-04-27 20:56:58 C 18 00 26.89 +51 16 53.5 – o 084
2008-04-27 21:01:02 C 18 00 26.88 +51 17 00.3 – d 557
2008-04-27 21:01:31 C 18 00 26.56 +51 17 01.3 – o 084
2008-04-27 21:05:45 C 18 00 26.24 +51 17 08.5 – o 084
2008-04-27 21:09:59 C 18 00 25.92 +51 17 15.8 – o 084
2008-04-27 21:14:12 C 18 00 25.64 +51 17 22.7 – o 084
2008-04-27 21:31:19 C 18 00 24.71 +51 17 51.9 – d 557
2008-04-27 21:34:20 C 18 00 24.18 +51 17 57.0 – o 084
2008-04-27 21:38:34 C 18 00 23.88 +51 18 03.6 – o 084
2008-04-27 21:42:47 C 18 00 23.58 +51 18 10.9 – o 084
2008-04-27 21:47:00 C 18 00 23.24 +51 18 18.1 – o 084
2008-04-27 21:51:14 C 18 00 22.92 +51 18 25.5 – o 084
2008-04-27 21:55:32 C 18 00 22.62 +51 18 32.4 – o 084
2008-04-27 22:06:41 C 18 00 22.18 +51 18 51.7 – d 557
2008-04-27 22:12:26 C 18 00 21.38 +51 19 01.3 – o 084
2008-04-27 22:20:55 C 18 00 20.75 +51 19 15.4 – o 084
2008-04-27 22:25:08 C 18 00 20.43 +51 19 22.5 – o 084
2008-04-27 22:29:21 C 18 00 20.11 +51 19 29.8 – o 084
2008-04-27 22:33:35 C 18 00 19.85 +51 19 36.3 – o 084
2008-04-27 22:37:49 C 18 00 19.52 +51 19 44.0 – o 084
2008-04-27 22:42:02 C 18 00 19.21 +51 19 50.6 – o 084
2008-04-27 22:46:20 C 18 00 18.89 +51 19 57.8 – o 084
2008-04-27 22:50:33 C 18 00 18.55 +51 20 05.4 – o 084
2008-04-27 23:02:09 C 18 00 18.10 +51 20 25.3 – d 557
2008-04-27 23:11:22 C 18 00 17.01 +51 20 40.2 – o 084
2008-04-27 23:15:36 C 18 00 16.66 +51 20 46.6 – o 084
2008-04-27 23:29:40 C 18 00 16.06 +51 21 11.8 – d 557
2008-04-28 00:04:39 C 18 00 13.42 +51 22 11.2 – d 557
2008-04-28 00:32:10 C 18 00 11.33 +51 22 57.6 – d 557
2008-04-28 00:59:42 C 18 00 09.25 +51 23 43.6 – d 557
2008-04-28 02:00:16 C 18 00 04.61 +51 25 24.5 – d 557
2008-04-28 23:41:58 C 17 58 28.72 +52 01 00.5 – o 084
2008-04-28 23:46:12 C 17 58 28.38 +52 01 07.5 – o 084
2008-04-28 23:51:27 C 17 58 27.96 +52 01 15.8 – o 084
2008-04-28 23:55:41 C 17 58 27.64 +52 01 23.2 – o 084
2008-04-28 23:59:54 C 17 58 27.28 +52 01 29.8 – o 084
2008-04-29 00:04:08 C 17 58 26.92 +52 01 37.0 – o 084
2008-04-29 00:08:22 C 17 58 26.63 +52 01 43.8 – o 084
2008-04-29 00:25:18 C 17 58 25.25 +52 02 12.2 – o 084
2008-04-29 00:29:32 C 17 58 24.90 +52 02 19.1 – o 084
2008-04-29 00:34:11 C 17 58 24.52 +52 02 26.6 – o 084
2008-04-29 00:38:26 C 17 58 24.21 +52 02 33.5 – o 084
2008-04-29 00:42:41 C 17 58 23.88 +52 02 40.1 – 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)