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
2019-06-02 05:47:40 C 11 25 15.08 +44 59 27.7 – U I41
2019-06-03 04:46:10 C 11 27 36.99 +44 36 33.0 – U I41
2019-06-03 04:53:02 C 11 27 37.55 +44 36 26.1 – V 703
2019-06-03 05:01:19 C 11 27 38.38 +44 36 17.7 – V 703
2019-06-03 05:09:35 C 11 27 39.19 +44 36 09.3 – V 703
2019-06-03 05:17:51 C 11 27 40.02 +44 36 00.8 – V 703
2019-06-03 05:46:33 C 11 27 42.98 +44 35 31.6 – U I41
2019-06-04 20:31:38 C 11 31 37.78 +43 56 55.4 – q 006
2019-06-07 05:41:17 C 11 37 14.47 +43 00 07.2 – V 703
2019-06-07 05:41:57 C 11 37 14.53 +43 00 06.8 – V 703
2019-06-07 05:49:33 C 11 37 15.23 +42 59 58.8 – V 703
2019-06-07 05:50:12 C 11 37 15.31 +42 59 58.3 – V 703
2019-06-07 05:57:48 C 11 37 16.01 +42 59 50.7 – V 703
2019-06-07 05:58:27 C 11 37 16.08 +42 59 49.8 – V 703
2019-06-07 06:06:04 C 11 37 16.82 +42 59 42.3 – V 703
2019-06-07 06:06:43 C 11 37 16.88 +42 59 41.6 – V 703
2019-06-08 07:58:51 C 11 39 46.22 +42 34 06.4 – V T08
2019-06-08 08:05:02 C 11 39 46.79 +42 34 00.1 – V T08
2019-06-08 08:14:23 C 11 39 47.65 +42 33 50.6 – V T08
2019-06-08 08:30:02 C 11 39 49.12 +42 33 34.6 – V T08
2019-06-11 04:56:17 C 11 46 15.34 +41 25 52.0 – V 703
2019-06-11 05:04:04 C 11 46 16.05 +41 25 44.5 – V 703
2019-06-11 05:11:51 C 11 46 16.76 +41 25 36.7 – V 703
2019-06-11 05:19:38 C 11 46 17.45 +41 25 28.8 – V 703
2019-06-12 06:25:59 C 11 48 36.48 +41 00 46.5 – V T08
2019-06-12 06:29:58 C 11 48 36.84 +41 00 42.4 – V T08
2019-06-12 06:37:19 C 11 48 37.49 +41 00 35.1 – V T08
2019-06-12 06:51:56 C 11 48 38.77 +41 00 20.6 – V T08
2019-06-13 20:27:09 C 11 52 03.77 +40 23 13.6 – q 160
2019-06-13 20:28:18 C 11 52 03.90 +40 23 13.1 – q 160
2019-06-13 20:29:25 C 11 52 04.02 +40 23 12.1 – q 160
2019-06-14 04:49:42 C 11 52 48.95 +40 15 00.4 – V 703
2019-06-14 04:57:26 C 11 52 49.61 +40 14 52.5 – V 703
2019-06-14 05:05:09 C 11 52 50.29 +40 14 45.0 – V 703
2019-06-14 05:12:53 C 11 52 50.97 +40 14 37.2 – V 703
2019-06-14 06:54:35 C 11 53 00.271 +40 13 00.40 – U F51
2019-06-14 07:11:57 C 11 53 01.781 +40 12 43.04 – U F51
2019-06-14 07:28:47 C 11 53 03.245 +40 12 26.20 – U F51
2019-06-16 07:14:43 C 11 57 18.55 +39 25 28.4 – V T08
2019-06-16 07:18:51 C 11 57 18.90 +39 25 24.2 – V T08
2019-06-16 07:29:32 C 11 57 19.80 +39 25 13.5 – V T08
2019-06-16 07:44:14 C 11 57 21.08 +39 24 58.6 – V T08
2019-06-20 05:57:08 C 12 05 32.99 +37 52 31.8 – V T08
2019-06-20 06:01:51 C 12 05 33.37 +37 52 27.2 – V T08
2019-06-20 06:09:22 C 12 05 34.01 +37 52 19.8 – V T08
2019-06-20 06:23:41 C 12 05 35.17 +37 52 05.4 – V T08
2019-06-22 04:27:10 C 12 09 30.47 +37 06 53.2 – V 703
2019-06-22 04:35:30 C 12 09 31.14 +37 06 45.0 – V 703
2019-06-22 04:43:50 C 12 09 31.83 +37 06 36.6 – V 703
2019-06-22 04:52:09 C 12 09 32.52 +37 06 28.4 – 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)