211871 (2004 HO)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5114667127 ± 2.53e-08
Semi-major axis (a)1.8469469255 AU ± 1.89e-09
Inclination (i)7.88165729° ± 7.10e-06
Long. of Asc. Node (Ω)146.05128755° ± 6.43e-05
Arg. of Perihelion (ω)163.87539517° ± 6.30e-05
Mean Anomaly (M)171.85638162° ± 5.77e-06
Mean Motion (n)0.3926726495°/day ± 6.03e-10
Perihelion dist (q)0.90229505 AU ± 4.67e-08
Aphelion dist (Q)2.79159880 AU ± 4.68e-08
Orbital Period2.51004567 yr ± 3.85e-09
Physical Parameters
H (abs. magnitude)18.85
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual0.433″
Uncertainty0
Orbit TypeApollo
MOID0.062018 AU
Observations Used274
Oppositions16
Arc Total1999-2025
First Observation Used1999-03-20
Last Observation Used2025-01-31
Observations (296)
Date Type RA Dec Mag Band Observatory
2004-04-24 07:10:53 C 12 54 48.98 +12 41 18.9 d 703
2004-04-27 21:32:20 C 12 48 50.92 +13 39 24.4 r 176
2004-04-27 21:34:40 C 12 48 50.77 +13 39 25.8 r 176
2004-04-27 21:37:00 C 12 48 50.61 +13 39 27.2 r 176
2004-04-27 21:39:20 C 12 48 50.45 +13 39 28.6 r 176
2004-04-27 21:41:40 C 12 48 50.30 +13 39 30.0 r 176
2004-05-04 04:51:47 C 12 38 55.21 +15 06 51.7 r 448
2004-05-04 05:02:18 C 12 38 54.59 +15 06 58.5 r 448
2004-05-04 05:20:17 C 12 38 53.33 +15 07 06.0 r 448
2004-05-08 21:54:16 C 12 32 14.43 +15 58 44.1 r 941
2004-05-08 21:55:55 C 12 32 14.36 +15 58 44.9 r 941
2004-05-08 21:59:13 C 12 32 14.16 +15 58 46.4 r 941
2004-05-08 22:02:32 C 12 32 13.96 +15 58 47.3 r 941
2004-05-12 04:58:14 C 12 28 03.83 +16 27 50.5 19.3 c 704
2004-05-12 05:12:06 C 12 28 03.16 +16 27 55.6 19.9 c 704
2004-05-12 05:27:00 C 12 28 02.28 +16 28 02.0 20.0 c 704
2004-05-12 05:41:17 C 12 28 01.56 +16 28 05.9 20.0 c 704
2004-05-12 05:55:06 C 12 28 00.84 +16 28 10.9 19.5 c 704
2004-05-18 05:57:46 C 12 21 40.35 +17 05 41.9 c 926
2004-05-18 06:02:17 C 12 21 40.12 +17 05 42.6 c 926
2004-05-18 06:06:45 C 12 21 39.93 +17 05 43.6 c 926
2004-05-19 05:17:56 C 12 20 48.81 +17 09 56.6 c 926
2004-05-19 05:22:42 C 12 20 48.61 +17 09 57.4 c 926
2004-05-19 05:27:29 C 12 20 48.40 +17 09 58.3 c 926
2004-07-01 03:45:41 C 12 28 46.30 +13 46 44.0 r 448
2004-07-01 04:03:10 C 12 28 47.17 +13 46 35.6 r 448
2004-07-01 04:21:02 C 12 28 47.84 +13 46 26.7 r 448
2004-09-05 10:25:31 C 14 10 58.30 -22 38 27.3 r 413
2004-09-05 10:30:31 C 14 10 58.79 -22 38 50.6 r 413
2004-09-25 15:23:38 C 22 35 04.11 -73 23 05.4 r E17
2004-09-25 15:27:52 C 22 35 10.98 -73 22 40.4 r E17
2004-09-25 15:32:04 C 22 35 18.46 -73 22 12.0 r E17
2004-09-30 02:23:37 C 00 17 56.43 -60 21 13.0 c 844
2004-09-30 02:26:38 C 00 17 57.75 -60 20 52.3 c 844
2004-09-30 02:31:06 C 00 17 59.55 -60 20 21.6 c 844
2004-09-30 02:35:47 C 00 18 01.49 -60 19 49.5 c 844
2004-10-10 12:16:36 C 01 05 41.06 -39 38 43.1 423
2004-10-10 12:27:40 C 01 05 41.73 -39 38 04.4 423
2004-10-10 12:37:41 C 01 05 42.40 -39 37 31.4 423
2004-10-10 12:47:40 C 01 05 43.03 -39 36 56.7 423
2004-10-10 12:57:41 C 01 05 43.58 -39 36 23.3 423
2004-10-10 13:07:40 C 01 05 44.28 -39 35 48.3 423
2004-10-10 13:17:41 C 01 05 44.87 -39 35 14.5 423
2004-10-23 07:07:26 C 01 19 19.40 -26 50 05.1 c 670
2004-10-23 07:10:30 C 01 19 19.40 -26 49 59.3 c 670
2004-11-05 04:35:57 C 01 26 33.19 -18 57 26.7 18.8 c 704
2004-11-05 04:53:17 C 01 26 33.45 -18 57 04.4 19.2 c 704
2004-11-05 05:10:37 C 01 26 33.68 -18 56 42.2 19.4 c 704
2004-11-05 05:27:56 C 01 26 34.03 -18 56 20.2 18.7 c 704
2004-11-05 05:45:15 C 01 26 34.26 -18 55 58.4 19.0 c 704