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
2004-11-06 10:34:37 C 01 27 13.31 -18 19 14.4 r E17
2004-11-06 10:54:11 C 01 27 13.58 -18 18 50.7 r E17
2004-11-06 11:13:43 C 01 27 13.94 -18 18 27.1 r E17
2004-11-11 05:49:52 C 01 29 51.05 -16 03 03.7 18.9 c 704
2004-11-11 06:07:18 C 01 29 51.30 -16 02 43.5 18.8 c 704
2004-11-11 06:24:43 C 01 29 51.66 -16 02 23.2 18.7 c 704
2004-11-11 06:42:08 C 01 29 51.99 -16 02 04.5 19.1 c 704
2004-11-11 06:59:36 C 01 29 52.34 -16 01 44.0 19.3 c 704
2009-03-28 08:29:42 C 13 19 10.02 +05 07 05.0 r G96
2009-03-28 08:39:37 C 13 19 09.55 +05 07 12.5 r G96
2009-03-28 08:49:26 C 13 19 08.97 +05 07 19.7 r G96
2009-03-28 08:59:22 C 13 19 08.54 +05 07 27.0 r G96
2009-03-29 08:25:05 C 13 18 00.00 +05 24 42.1 c 711
2009-03-29 08:35:03 C 13 17 59.49 +05 24 49.2 c 711
2009-03-29 08:45:02 C 13 17 58.97 +05 24 56.5 c 711
2009-04-13 20:14:01 C 12 55 45.13 +10 08 51.7 A13
2009-04-13 20:46:14 C 12 55 42.93 +10 09 15.7 A13
2009-04-18 09:28:35 C 12 48 17.20 +11 28 35.6 r 703
2009-04-18 09:35:38 C 12 48 16.63 +11 28 41.1 r 703
2009-04-18 09:42:38 C 12 48 16.16 +11 28 47.4 r 703
2009-04-18 09:49:33 C 12 48 15.62 +11 28 52.3 r 703
2009-04-27 07:12:04 C 12 33 51.62 +13 45 25.2 r 703
2009-04-27 07:21:31 C 12 33 51.04 +13 45 32.4 r 703
2009-04-27 07:31:13 C 12 33 50.40 +13 45 36.9 r 703
2009-04-27 07:40:40 C 12 33 49.78 +13 45 44.3 r 703
2009-04-29 08:20:36 C 12 30 43.87 +14 12 10.7 o 568
2009-04-30 07:11:05 C 12 29 18.94 +14 23 53.6 o 568
2009-04-30 07:54:27 C 12 29 16.10 +14 24 15.6 o 568
2009-04-30 08:16:07 C 12 29 14.69 +14 24 26.5 o 568
2009-05-16 06:19:58 C 12 10 34.96 +16 31 14.5 r 703
2009-05-16 06:33:05 C 12 10 34.42 +16 31 16.9 r 703
2009-05-16 06:46:22 C 12 10 33.85 +16 31 17.5 r 703
2009-05-16 06:59:35 C 12 10 33.45 +16 31 19.6 r 703
2009-05-22 02:27:02 C 12 06 42.51 +16 45 34.1 o H55
2009-05-22 02:44:50 C 12 06 42.12 +16 45 34.9 o H55
2009-05-22 03:02:36 C 12 06 41.69 +16 45 36.0 o H55
2009-09-30 08:38:43 C 19 29 39.27 -54 40 25.7 r 432
2009-09-30 08:49:27 C 19 29 49.26 -54 40 34.2 r 432
2009-09-30 09:00:11 C 19 29 59.35 -54 40 42.3 r 432
2009-10-01 09:36:54 C 19 53 34.84 -54 51 29.6 r 432
2009-10-01 09:49:41 C 19 53 46.61 -54 51 31.5 r 432
2009-10-01 10:00:45 C 19 53 57.33 -54 51 32.0 r E12
2009-10-23 14:24:17 C 00 04 21.02 -32 32 39.8 r E12
2009-10-23 14:36:11 C 00 04 22.87 -32 32 11.4 r E12
2009-10-23 15:00:04 C 00 04 26.57 -32 31 14.3 r E12
2009-11-16 03:51:29 C 00 59 24.68 -16 39 10.1 r 703
2009-11-16 04:02:00 C 00 59 25.44 -16 38 58.9 r 703
2009-11-16 04:12:26 C 00 59 26.05 -16 38 45.0 r 703
2009-11-16 04:22:56 C 00 59 26.73 -16 38 31.7 r 703
2014-02-27 09:15:22 C 13 22 49.29 -00 21 29.7 q G96