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
2020-04-11 04:05:09 C 20 12 37.53 +14 53 49.5 – V 160
2020-04-11 04:07:30 C 20 12 37.80 +14 53 51.2 – V 160
2020-04-12 12:35:59 C 20 16 46.22 +15 24 58.8 – V T05
2020-04-12 12:50:22 C 20 16 48.04 +15 25 12.5 – V T05
2020-04-12 12:55:02 C 20 16 48.63 +15 25 17.1 – V T05
2020-04-12 15:19:49 C 20 17 06.91 +15 27 37.2 – V T05
2020-04-16 02:24:30 C 20 27 55.44 +16 47 59.9 – V 160
2020-04-16 02:27:22 C 20 27 55.77 +16 48 03.1 – V 160
2020-04-16 02:30:16 C 20 27 56.14 +16 48 05.6 – V 160
2020-04-17 02:52:17 C 20 31 10.33 +17 11 56.5 – V 160
2020-04-17 02:55:09 C 20 31 10.70 +17 11 59.3 – V 160
2020-04-17 02:58:02 C 20 31 11.04 +17 12 02.3 – V 160
2020-04-18 13:22:45 C 20 35 48.85 +17 45 54.9 – V T08
2020-04-18 13:23:25 C 20 35 48.91 +17 45 55.5 – V T08
2020-04-18 13:52:23 C 20 35 52.81 +17 46 24.3 – V T08
2020-04-18 13:53:44 C 20 35 52.92 +17 46 25.7 – V T08
2020-04-18 15:10:23 C 20 36 03.20 +17 47 42.0 – V T08
2020-04-18 15:11:02 C 20 36 03.30 +17 47 42.5 – V T08
2020-04-26 10:18:09 C 21 02 35.13 +20 54 02.8 – V 703
2020-04-26 10:26:55 C 21 02 36.42 +20 54 11.7 – V 703
2020-04-26 10:35:41 C 21 02 37.71 +20 54 20.6 – V 703
2020-04-26 10:44:27 C 21 02 39.00 +20 54 29.6 – V 703
2020-04-26 13:58:24 C 21 03 07.92 +20 57 46.6 – V T08
2020-04-26 14:03:04 C 21 03 08.60 +20 57 51.3 – V T08
2020-04-26 14:31:07 C 21 03 12.73 +20 58 19.8 – V T08
2020-04-26 14:46:30 C 21 03 14.98 +20 58 35.4 – V T08
2020-04-28 14:15:47 C 21 10 25.99 +21 46 14.1 – V T05
2020-04-28 14:41:18 C 21 10 29.86 +21 46 39.9 – V T05
2020-04-28 14:55:15 C 21 10 31.96 +21 46 54.1 – V T05
2020-04-28 15:03:42 C 21 10 33.23 +21 47 02.6 – V T05
2020-05-01 10:30:10 C 21 21 07.56 +22 54 35.6 – V G96
2020-05-01 10:36:16 C 21 21 08.51 +22 54 41.5 – V G96
2020-05-01 10:42:23 C 21 21 09.48 +22 54 48.3 – V G96
2020-05-01 10:48:29 C 21 21 10.45 +22 54 54.1 – V G96
2020-05-04 02:44:25 C 21 31 38.14 +23 58 37.5 – V 160
2020-05-04 02:47:20 C 21 31 38.61 +23 58 40.4 – V 160
2020-05-04 02:50:13 C 21 31 39.10 +23 58 43.2 – V 160
2020-05-04 13:50:05 C 21 33 30.09 +24 09 42.6 – V T08
2020-05-04 13:57:31 C 21 33 31.33 +24 09 50.1 – V T08
2020-05-04 14:23:27 C 21 33 35.63 +24 10 16.2 – V T08
2020-05-04 14:40:11 C 21 33 38.41 +24 10 33.0 – V T08
2020-05-06 09:52:17 C 21 41 02.82 +24 53 08.6 – V 703
2020-05-06 10:00:57 C 21 41 04.31 +24 53 17.5 – V 703
2020-05-06 10:09:36 C 21 41 05.79 +24 53 26.1 – V 703
2020-05-06 10:18:15 C 21 41 07.29 +24 53 34.7 – V 703
2020-05-06 13:27:29 C 21 41 40.34 +24 56 43.0 – V T05
2020-05-06 13:32:07 C 21 41 41.13 +24 56 47.6 – V T05
2020-05-06 13:58:39 C 21 41 45.72 +24 57 14.1 – V T05
2020-05-11 19:17:11 C 22 04 44.58 +26 58 01.2 – q D29
2020-05-11 19:33:10 C 22 04 47.62 +26 58 16.4 – q D29
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)