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
2025-04-21 18:09:54 C 15 54 51.042 +65 49 45.26 W M01
2025-04-22 01:54:45 C 15 52 36.787 +65 53 07.14 W M01
2025-04-22 01:57:15 C 15 52 36.069 +65 53 08.06 W M01
2025-04-22 01:59:45 C 15 52 35.352 +65 53 08.98 W M01
2025-04-22 11:44:20 C 15 49 54.766 +65 56 56.65 V T05
2025-04-22 11:46:57 C 15 49 53.993 +65 56 57.70 V T05
2025-04-22 11:51:32 C 15 49 52.654 +65 56 59.32 V T05
2025-04-22 11:59:24 C 15 49 50.352 +65 57 02.27 V T05
2025-04-23 10:26:22 C 15 43 35.198 +66 04 13.87 V 703
2025-04-23 10:29:54 C 15 43 34.172 +66 04 14.88 V 703
2025-04-23 10:33:26 C 15 43 33.154 +66 04 15.67 V 703
2025-04-23 10:36:58 C 15 43 32.135 +66 04 16.57 V 703
2025-04-23 20:32:07 C 15 40 49.27 +66 06 49.0 q 168
2025-04-23 21:00:35 C 15 40 41.17 +66 06 56.3 q 168
2025-04-23 21:28:38 C 15 40 33.20 +66 07 03.5 q 168
2025-04-23 21:56:34 C 15 40 25.29 +66 07 10.2 q 168
2025-04-23 22:26:38 C 15 40 16.75 +66 07 17.5 q 168
2025-04-23 22:56:42 C 15 40 08.23 +66 07 24.4 q 168
2025-04-24 01:00:13 C 15 39 36.046 +66 08 02.58 V R17
2025-04-24 01:20:45 C 15 39 30.134 +66 08 07.98 V R17
2025-04-24 01:41:18 C 15 39 24.211 +66 08 13.20 V R17
2025-04-24 02:01:49 C 15 39 18.295 +66 08 18.28 V R17
2025-04-24 21:22:15 B 15 34 00.425 +66 12 12.02 q S86
2025-04-24 21:40:53 B 15 33 55.066 +66 12 15.59 q S86
2025-04-24 21:59:31 B 15 33 49.670 +66 12 19.26 q S86
2025-04-24 22:18:08 B 15 33 44.297 +66 12 22.54 q S86
2025-04-25 09:18:36 C 15 30 43.621 +66 13 57.94 V 703
2025-04-25 09:22:02 C 15 30 42.674 +66 13 58.37 V 703
2025-04-25 09:25:27 C 15 30 41.681 +66 13 58.66 V 703
2025-04-25 09:28:53 C 15 30 40.698 +66 13 59.05 V 703
2025-04-25 20:50:46 C 15 27 37.45 +66 15 04.3 V M31
2025-04-25 20:51:50 C 15 27 37.20 +66 15 04.4 V M31
2025-04-25 20:52:54 C 15 27 36.90 +66 15 04.5 V M31
2025-04-25 20:53:57 C 15 27 36.59 +66 15 04.6 V M31
2025-04-25 20:55:01 C 15 27 36.29 +66 15 04.6 V M31
2025-04-25 20:56:05 C 15 27 36.01 +66 15 04.9 V M31
2025-04-25 20:57:09 C 15 27 35.72 +66 15 04.9 V M31
2025-04-25 20:58:13 C 15 27 35.43 +66 15 05.1 V M31
2025-04-25 20:59:17 C 15 27 35.15 +66 15 05.2 V M31
2025-04-25 21:00:20 C 15 27 34.84 +66 15 05.3 V M31
2025-04-25 21:01:26 C 15 27 34.56 +66 15 05.4 V M31
2025-04-25 22:38:09 C 15 27 08.592 +66 15 17.42 Z C23
2025-04-25 22:59:52 C 15 27 02.657 +66 15 20.48 Z C23
2025-04-25 23:14:15 C 15 26 58.428 +66 15 21.35 Z C23
2025-04-26 01:01:41 C 15 26 29.717 +66 15 37.58 V R17
2025-04-26 01:22:12 C 15 26 23.938 +66 15 39.64 V R17
2025-04-26 01:42:45 C 15 26 18.146 +66 15 41.58 V R17
2025-04-26 02:03:17 C 15 26 12.358 +66 15 43.34 V R17
2025-04-26 10:25:38 C 15 23 58.135 +66 16 16.86 V T05
2025-04-26 10:28:54 C 15 23 57.226 +66 16 17.22 V T05
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)