2009 HL21

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4447332174 ± 6.32e-07
Semi-major axis (a)1.6637403526 AU ± 6.48e-09
Inclination (i)1.00992764° ± 4.84e-06
Long. of Asc. Node (Ω)144.32727115° ± 9.27e-04
Arg. of Perihelion (ω)9.46009792° ± 1.03e-03
Mean Anomaly (M)284.40259320° ± 3.15e-05
Mean Motion (n)0.4592867863°/day ± 2.68e-09
Perihelion dist (q)0.92381975 AU ± 1.05e-06
Aphelion dist (Q)2.40366095 AU ± 1.05e-06
Orbital Period2.14599312 yr ± 1.25e-08
Physical Parameters
H (abs. magnitude)22.55
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual0.318″
Uncertainty0
Orbit TypeApollo
MOID0.007908 AU
Observations Used137
Oppositions8
Arc Total2009-2024
First Observation Used2009-04-20
Last Observation Used2024-05-08
Observations (138)
Date Type RA Dec Mag Band Observatory
2009-04-20 22:08:34 C 13 45 03.98 +04 21 49.2 r 621
2009-04-20 22:16:26 C 13 45 05.54 +04 21 19.7 r 621
2009-04-20 22:20:24 C 13 45 06.29 +04 21 05.8 r 621
2009-04-20 22:24:21 C 13 45 07.07 +04 20 51.0 r 621
2009-04-20 22:28:18 C 13 45 07.79 +04 20 38.0 r 621
2009-04-20 22:32:15 C 13 45 08.60 +04 20 22.9 r 621
2009-04-20 22:36:11 C 13 45 09.38 +04 20 08.2 r 621
2009-04-20 22:40:09 C 13 45 10.09 +04 19 54.8 r 621
2009-04-21 20:41:42 C 13 49 38.17 +03 05 25.1 r 113
2009-04-21 20:43:48 C 13 49 38.51 +03 05 18.3 r 113
2009-04-21 20:45:54 C 13 49 38.87 +03 05 11.5 r 113
2009-04-21 20:48:00 C 13 49 39.22 +03 05 05.0 r 113
2009-04-21 20:54:39 C 13 49 40.76 +03 04 45.4 r A17
2009-04-21 20:57:28 C 13 49 41.25 +03 04 36.5 r A17
2009-04-21 21:03:36 C 13 49 42.28 +03 04 16.8 r A17
2009-04-21 21:09:49 C 13 49 43.33 +03 03 57.4 r A17
2009-04-21 21:16:06 C 13 49 44.39 +03 03 37.5 r A17
2009-04-21 21:16:33 C 13 49 41.59 +03 03 45.4 17.7 r 114
2009-04-21 21:17:52 C 13 49 41.85 +03 03 41.3 17.9 r 114
2009-04-21 21:22:17 C 13 49 44.83 +03 03 20.2 v B03
2009-04-21 21:24:51 C 13 49 46.47 +03 03 07.1 r J95
2009-04-21 21:27:25 C 13 49 46.90 +03 02 58.7 r J95
2009-04-21 21:27:55 C 13 49 45.78 +03 03 02.7 v B03
2009-04-21 21:29:58 C 13 49 47.33 +03 02 51.2 r J95
2009-04-21 21:33:33 C 13 49 46.73 +03 02 44.5 v B03
2009-04-21 21:34:01 C 13 49 47.03 +03 02 43.1 o B36
2009-04-21 21:38:25 C 13 49 47.76 +03 02 28.9 o B36
2009-04-21 21:39:12 C 13 49 47.65 +03 02 26.9 v B03
2009-04-21 21:42:48 C 13 49 48.47 +03 02 15.3 o B36
2009-04-21 21:50:01 C 13 49 50.96 +03 01 44.6 o J41
2009-04-21 21:50:09 C 13 49 50.06 +03 01 49.8 o 611
2009-04-21 21:52:29 C 13 49 50.46 +03 01 42.8 o 611
2009-04-21 21:54:49 C 13 49 50.84 +03 01 35.3 o 611
2009-04-21 21:55:44 C 13 49 51.90 +03 01 26.9 o J41
2009-04-21 22:06:48 C 13 49 53.82 +03 00 51.9 o J41
2009-04-21 22:11:12 C 13 49 53.59 +03 00 41.7 o 510
2009-04-21 22:35:51 C 13 49 57.67 +02 59 24.1 o 510
2009-04-21 23:00:10 C 13 50 01.64 +02 58 07.8 o 510
2009-04-21 23:32:15 C 13 50 06.97 +02 56 26.6 r 621
2009-04-21 23:35:06 C 13 50 07.46 +02 56 18.0 r 621
2009-04-21 23:37:57 C 13 50 07.91 +02 56 09.7 r 621
2009-04-22 00:00:36 C 13 50 11.63 +02 54 58.3 r 621
2009-04-22 00:03:27 C 13 50 12.09 +02 54 49.0 r 621
2009-04-22 00:47:23 C 13 50 19.00 +02 52 39.0 v 204
2009-04-22 00:49:20 C 13 50 19.32 +02 52 32.9 v 204
2009-04-22 00:53:41 C 13 50 20.05 +02 52 19.3 v 204
2009-04-22 00:59:19 C 13 50 20.94 +02 52 01.6 v 204
2009-04-22 06:46:54 C 13 51 24.53 +02 34 27.1 o H55
2009-04-22 06:49:51 C 13 51 24.99 +02 34 18.3 o H55
2009-04-22 06:52:49 C 13 51 25.44 +02 34 09.3 o H55