216689 (2004 HM1)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5322677910 ± 1.36e-08
Semi-major axis (a)2.7624563117 AU ± 5.91e-09
Inclination (i)4.17040853° ± 1.79e-06
Long. of Asc. Node (Ω)151.80830158° ± 1.47e-05
Arg. of Perihelion (ω)159.66458610° ± 1.53e-05
Mean Anomaly (M)210.61773796° ± 1.88e-06
Mean Motion (n)0.2146689088°/day ± 6.89e-10
Perihelion dist (q)1.29208979 AU ± 3.78e-08
Aphelion dist (Q)4.23282283 AU ± 3.88e-08
Orbital Period4.59137883 yr ± 1.47e-08
Physical Parameters
H (abs. magnitude)17.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual0.201″
Uncertainty0
Orbit TypeAmor
MOID0.277255 AU
Observations Used433
Oppositions23
Arc Total1995-2024
First Observation Used1995-09-20
Last Observation Used2024-01-01
Observations (488)
Date Type RA Dec Mag Band Observatory
2018-08-21 10:38:54 C 21 10 55.23 -14 05 22.3 U T08
2018-08-21 10:53:38 C 21 10 56.12 -14 05 27.5 U T08
2018-08-28 00:29:56 C 21 22 00.82 -14 57 32.4 q Y00
2018-08-28 00:46:02 C 21 22 01.87 -14 57 37.4 q Y00
2018-08-28 00:59:59 C 21 22 02.80 -14 57 41.3 q Y00
2018-09-01 10:50:29 C 21 29 28.47 -15 25 46.8 U T05
2018-09-01 11:20:11 C 21 29 30.37 -15 25 53.2 U T05
2018-09-01 11:35:49 C 21 29 31.37 -15 25 56.6 U T05
2018-09-03 10:40:51 C 21 32 50.11 -15 36 08.0 U T08
2018-09-03 10:56:12 C 21 32 51.08 -15 36 10.9 U T08
2018-09-03 11:10:54 C 21 32 52.01 -15 36 13.6 U T08
2018-09-03 11:26:13 C 21 32 53.01 -15 36 16.6 U T08
2018-09-04 05:02:27 C 21 34 08.44 -15 39 48.5 V 703
2018-09-04 05:09:36 C 21 34 08.91 -15 39 49.9 V 703
2018-09-04 05:16:46 C 21 34 09.36 -15 39 51.3 V 703
2018-09-04 05:23:55 C 21 34 09.82 -15 39 52.5 V 703
2018-09-07 04:24:58 C 21 39 08.59 -15 51 44.8 V 703
2018-09-07 04:33:14 C 21 39 09.12 -15 51 46.1 V 703
2018-09-07 04:41:30 C 21 39 09.65 -15 51 47.3 V 703
2018-09-07 04:49:47 C 21 39 10.19 -15 51 48.8 V 703
2018-09-08 22:01:24 C 21 42 03.19 -15 57 09.9 o Z22
2018-09-08 22:06:47 C 21 42 03.51 -15 57 11.2 o Z22
2018-09-09 10:40:54 C 21 42 54.96 -15 58 33.3 U T05
2018-09-09 10:56:09 C 21 42 55.93 -15 58 34.9 U T05
2018-09-09 11:10:49 C 21 42 56.87 -15 58 36.2 U T05
2018-09-09 11:26:11 C 21 42 57.87 -15 58 37.7 U T05
2018-09-09 13:43:47 C 21 43 08.71 -15 58 57.1 q D29
2018-09-09 14:11:16 C 21 43 10.46 -15 59 00.2 q D29
2018-09-09 14:31:37 C 21 43 11.77 -15 59 02.3 q D29
2018-09-10 04:21:08 C 21 44 10.19 -16 00 26.5 V 703
2018-09-10 04:28:43 C 21 44 10.68 -16 00 27.1 V 703
2018-09-10 04:36:19 C 21 44 11.17 -16 00 27.9 V 703
2018-09-10 04:43:53 C 21 44 11.66 -16 00 28.8 V 703
2018-09-11 10:44:04 C 21 46 16.21 -16 03 00.9 U T08
2018-09-11 10:58:43 C 21 46 17.13 -16 03 02.2 U T08
2018-09-11 11:14:02 C 21 46 18.13 -16 03 03.2 U T08
2018-09-13 03:55:00 C 21 49 09.89 -16 05 43.0 U 703
2018-09-13 04:02:50 C 21 49 10.38 -16 05 43.3 U 703
2018-09-13 04:10:40 C 21 49 10.89 -16 05 43.9 U 703
2018-09-13 04:18:31 C 21 49 11.40 -16 05 44.3 U 703
2018-09-15 09:53:47 C 21 52 54.53 -16 07 26.3 U T08
2018-09-15 10:08:11 C 21 52 55.44 -16 07 26.7 U T08
2018-09-15 10:22:34 C 21 52 56.36 -16 07 26.8 U T08
2018-09-15 10:37:05 C 21 52 57.28 -16 07 27.0 U T08
2018-09-16 05:19:17 C 21 54 16.21 -16 07 41.6 V 703
2018-09-16 05:26:51 C 21 54 16.70 -16 07 41.8 V 703
2018-09-16 05:31:24 C 21 54 17.00 -16 07 41.6 V G96
2018-09-16 05:34:28 C 21 54 17.18 -16 07 41.8 V 703
2018-09-16 05:38:51 C 21 54 17.48 -16 07 41.5 V G96
2018-09-16 05:42:03 C 21 54 17.70 -16 07 41.9 V 703