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
2022-05-14 22:15:37 C 11 56 38.97 +58 35 16.4 V G34
2022-05-14 22:18:14 C 11 56 39.08 +58 35 13.3 V G34
2022-05-14 22:20:40 C 11 56 39.12 +58 35 10.3 V G34
2022-05-14 23:01:14 C 11 56 40.36 +58 34 19.3 V L63
2022-05-14 23:15:52 C 11 56 40.85 +58 33 59.8 V L63
2022-05-14 23:29:59 C 11 56 41.30 +58 33 41.4 V L63
2022-05-16 22:06:29 C 11 58 25.79 +57 34 50.4 V C23
2022-05-16 22:10:49 C 11 58 25.94 +57 34 44.9 V C23
2022-05-16 22:16:12 C 11 58 26.11 +57 34 38.1 V C23
2022-05-18 02:52:51 C 11 59 31.66 +56 59 03.9 Z W33
2022-05-18 03:14:23 C 11 59 32.37 +56 58 36.7 Z W33
2022-05-18 03:36:32 C 11 59 33.10 +56 58 08.8 Z W33
2022-05-18 05:28:14 C 11 59 37.504 +56 55 52.72 V 703
2022-05-18 05:36:35 C 11 59 37.777 +56 55 42.10 V 703
2022-05-18 05:44:55 C 11 59 38.047 +56 55 31.66 V 703
2022-05-18 05:53:16 C 11 59 38.317 +56 55 21.11 V 703
2022-05-18 06:00:30 C 11 59 38.252 +56 55 11.60 V 703
2022-05-18 06:08:49 C 11 59 38.558 +56 55 00.88 V 703
2022-05-18 06:17:07 C 11 59 38.832 +56 54 50.36 V 703
2022-05-18 06:25:26 C 11 59 39.116 +56 54 39.96 V 703
2022-05-19 04:22:20 C 12 00 30.913 +56 27 35.39 V G96
2022-05-19 04:30:38 C 12 00 31.169 +56 27 25.16 V G96
2022-05-19 04:38:55 C 12 00 31.439 +56 27 14.83 V G96
2022-05-19 04:47:12 C 12 00 31.698 +56 27 04.64 V G96
2022-05-24 05:42:16 C 12 05 23.478 +54 00 50.51 V 703
2022-05-24 05:50:03 C 12 05 23.788 +54 00 40.93 V 703
2022-05-24 05:57:49 C 12 05 24.061 +54 00 31.61 V 703
2022-05-24 06:05:36 C 12 05 24.346 +54 00 22.10 V 703
2022-05-24 21:11:38 C 12 06 02.11 +53 42 21.2 V C40
2022-05-24 21:12:21 C 12 06 02.13 +53 42 20.3 V C40
2022-05-24 21:13:25 C 12 06 02.17 +53 42 19.0 V C40
2022-05-24 21:13:45 C 12 06 02.18 +53 42 18.6 V C40
2022-05-24 21:14:07 C 12 06 02.20 +53 42 18.2 V C40
2022-05-24 21:14:49 C 12 06 02.23 +53 42 17.3 V C40
2022-05-24 21:15:52 C 12 06 02.26 +53 42 16.0 V C40
2022-05-24 21:16:13 C 12 06 02.28 +53 42 15.6 V C40
2022-05-24 21:17:17 C 12 06 02.33 +53 42 14.4 V C40
2022-05-24 21:17:39 C 12 06 02.34 +53 42 14.0 V C40
2022-05-24 21:20:07 C 12 06 02.43 +53 42 10.9 V C40
2022-05-24 21:20:28 C 12 06 02.44 +53 42 10.4 V C40
2022-05-24 21:21:10 C 12 06 02.48 +53 42 09.7 V C40
2022-05-24 21:23:18 C 12 06 02.56 +53 42 07.0 V C40
2022-05-24 21:23:40 C 12 06 02.57 +53 42 06.5 V C40
2022-05-24 21:24:01 C 12 06 02.58 +53 42 06.2 V C40
2022-05-24 21:25:24 C 12 06 02.64 +53 42 04.5 V C40
2022-05-24 21:25:47 C 12 06 02.66 +53 42 04.1 V C40
2022-05-24 21:26:28 C 12 06 02.69 +53 42 03.2 V C40
2022-05-24 21:26:49 C 12 06 02.71 +53 42 02.7 V C40
2022-05-24 21:28:58 C 12 06 02.79 +53 42 00.1 V C40
2022-05-24 21:29:19 C 12 06 02.79 +53 41 59.7 V C40
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)