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
2009-04-26 07:53:04 C 14 04 54.69 -01 18 36.2 18.5 c 704
2009-04-26 08:10:32 C 14 04 56.23 -01 19 09.4 18.5 c 704
2009-04-27 07:54:51 C 14 07 23.19 -02 02 16.0 r 703
2009-04-27 08:06:24 C 14 07 24.13 -02 02 35.3 r 703
2009-04-27 08:18:00 C 14 07 24.99 -02 02 55.5 r 703
2009-04-27 08:29:35 C 14 07 25.89 -02 03 16.1 r 703
2009-04-29 03:21:39 C 14 11 20.34 -03 11 25.7 o 691
2009-04-29 03:47:03 C 14 11 22.16 -03 12 03.5 o 691
2009-04-29 04:12:25 C 14 11 23.89 -03 12 40.7 o 691
2009-04-29 23:20:07 C 14 12 51.46 -03 39 49.6 r J75
2009-04-29 23:38:41 C 14 12 52.59 -03 40 14.6 r J75
2009-04-29 23:57:12 C 14 12 53.64 -03 40 39.4 r J75
2009-04-30 06:02:46 C 14 13 21.81 -03 48 48.6 18.8 c 704
2009-04-30 06:17:15 C 14 13 22.65 -03 49 07.7 19.0 c 704
2009-04-30 06:31:42 C 14 13 23.56 -03 49 26.8 19.2 c 704
2009-04-30 06:46:10 C 14 13 24.28 -03 49 45.3 19.1 c 704
2009-04-30 07:00:38 C 14 13 25.10 -03 50 06.2 19.0 c 704
2009-05-11 08:07:33 C 14 26 52.18 -07 55 13.8 r 448
2009-05-11 08:37:50 C 14 26 52.98 -07 55 35.1 r 448
2009-05-11 09:07:39 C 14 26 53.81 -07 55 53.5 r 448
2009-05-16 06:37:17 C 14 30 53.35 -09 05 06.5 r G96
2009-05-16 06:59:12 C 14 30 53.83 -09 05 18.2 r G96
2009-05-16 07:10:11 C 14 30 54.09 -09 05 24.0 r G96
2009-05-30 04:29:15 C 14 41 00.15 -11 31 24.3 o 291
2009-05-30 04:37:06 C 14 41 00.34 -11 31 27.7 o 291
2009-05-30 06:09:52 C 14 41 02.66 -11 32 02.9 o 291
2009-05-31 06:10:16 C 14 41 48.23 -11 40 59.3 o 291
2009-05-31 06:29:52 C 14 41 48.68 -11 41 07.6 o 291
2024-05-03 05:31:26 C 11 12 33.984 +11 58 38.10 V G96
2024-05-03 05:38:51 C 11 12 36.529 +11 58 19.63 V G96
2024-05-03 05:46:16 C 11 12 39.118 +11 58 01.38 V G96
2024-05-03 05:53:41 C 11 12 41.641 +11 57 42.98 V G96
2024-05-07 22:29:35 C 11 48 37.961 +07 37 57.68 V J95
2024-05-07 22:43:23 C 11 48 41.803 +07 37 29.39 V J95
2024-05-08 05:52:11 C 11 50 42.518 +07 22 31.30 V I52
2024-05-08 05:53:18 C 11 50 42.810 +07 22 28.67 V I52
2024-05-08 05:57:26 C 11 50 43.930 +07 22 19.92 V I52
2024-05-08 05:58:33 C 11 50 44.221 +07 22 17.76 V I52