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
1999-03-20 09:00:38 C 13 49 40.646 +01 14 20.10 e 645
1999-03-20 09:05:37 C 13 49 40.531 +01 14 23.11 21.55 e 645
2004-04-17 05:45:44 C 13 06 37.56 +10 34 04.6 19.4 c 704
2004-04-17 06:01:09 C 13 06 36.44 +10 34 16.7 19.4 c 704
2004-04-17 06:16:33 C 13 06 35.31 +10 34 28.9 19.5 c 704
2004-04-17 06:32:04 C 13 06 34.14 +10 34 41.6 19.5 c 704
2004-04-18 20:00:54 C 13 03 59.29 +11 03 56.4 c A50
2004-04-18 20:05:57 C 13 03 58.81 +11 04 00.7 c A50
2004-04-18 20:11:00 C 13 03 58.46 +11 04 04.6 c A50
2004-04-18 20:16:03 C 13 03 58.19 +11 04 08.9 c A50
2004-04-18 20:22:05 C 13 03 57.77 +11 04 13.6 c A50
2004-04-18 20:27:09 C 13 03 57.39 +11 04 17.2 c A50
2004-04-18 20:32:11 C 13 03 57.08 +11 04 21.6 c A50
2004-04-18 21:31:47 C 13 03 52.85 +11 05 06.5 c 113
2004-04-18 21:36:36 C 13 03 52.50 +11 05 10.9 c 113
2004-04-18 21:41:11 C 13 03 52.23 +11 05 14.9 c 113
2004-04-18 21:51:59 C 13 03 51.49 +11 05 23.2 c 246
2004-04-18 21:54:12 C 13 03 51.31 +11 05 25.0 c 246
2004-04-18 22:06:10 C 13 03 50.45 +11 05 34.7 c 246
2004-04-18 22:07:26 C 13 03 50.33 +11 05 35.7 c 246
2004-04-19 00:55:53 C 13 03 38.40 +11 07 45.4 r J95
2004-04-19 01:04:20 C 13 03 37.75 +11 07 51.3 r J95
2004-04-19 05:53:26 C 13 03 18.06 +11 11 38.3 19.7 c 704
2004-04-19 06:09:31 C 13 03 16.99 +11 11 51.1 c 854
2004-04-19 06:09:38 C 13 03 16.86 +11 11 51.2 19.7 c 704
2004-04-19 06:18:31 C 13 03 16.30 +11 11 58.2 c 926
2004-04-19 06:19:02 C 13 03 16.29 +11 11 58.6 c 854
2004-04-19 06:23:30 C 13 03 15.93 +11 12 02.8 c 926
2004-04-19 06:25:50 C 13 03 15.71 +11 12 03.6 19.8 c 704
2004-04-19 06:26:18 C 13 03 15.66 +11 12 03.3 19.4 c 704
2004-04-19 06:28:27 C 13 03 15.52 +11 12 06.0 c 926
2004-04-19 06:28:32 C 13 03 15.49 +11 12 05.5 c 854
2004-04-19 06:41:52 C 13 03 14.50 +11 12 15.9 19.9 c 704
2004-04-19 06:42:01 C 13 03 14.50 +11 12 16.4 19.5 c 704
2004-04-19 06:57:55 C 13 03 13.32 +11 12 28.2 19.5 c 704
2004-04-19 06:58:01 C 13 03 13.32 +11 12 28.6 19.8 c 704
2004-04-20 06:26:53 C 13 01 35.24 +11 30 27.3 c 711
2004-04-20 06:36:58 C 13 01 34.50 +11 30 35.0 c 711
2004-04-20 06:47:07 C 13 01 33.74 +11 30 42.3 c 711
2004-04-21 22:59:39 C 12 58 45.10 +12 00 46.3 r 170
2004-04-21 23:01:16 C 12 58 44.96 +12 00 47.2 r 170
2004-04-21 23:02:54 C 12 58 44.84 +12 00 48.5 r 170
2004-04-22 05:52:44 C 12 58 16.31 +12 05 51.5 19.6 c 704
2004-04-22 06:08:23 C 12 58 15.15 +12 06 03.5 19.7 c 704
2004-04-22 06:23:53 C 12 58 13.97 +12 06 15.5 20.2 c 704
2004-04-22 06:39:32 C 12 58 12.89 +12 06 26.5 19.8 c 704
2004-04-22 06:55:03 C 12 58 11.75 +12 06 38.1 19.6 c 704
2004-04-24 06:30:43 C 12 54 51.99 +12 40 50.6 d 703
2004-04-24 06:44:03 C 12 54 51.05 +12 41 00.6 d 703
2004-04-24 06:57:28 C 12 54 49.98 +12 41 07.7 d 703