IAA RAS IAA Minor Planet Database

2004 ER21

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.1709350100 ± 8.94e-04
Semi-major axis (a)0.8990291688 AU ± 2.51e-04
Inclination (i)7.94595970° ± 3.73e-02
Long. of Asc. Node (Ω)357.24640757° ± 2.94e-02
Arg. of Perihelion (ω)343.52444502° ± 9.96e-02
Mean Anomaly (M)347.72983793° ± 8.82e-01
Mean Motion (n)1.1562496181°/day ± 4.85e-04
Perihelion dist (q)0.74535361 AU ± 8.30e-04
Aphelion dist (Q)1.05270473 AU ± 8.56e-04
Orbital Period0.85243382 yr ± 3.57e-04
Physical Parameters
H (abs. magnitude)24.40
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual0.601″
Uncertainty3
Orbit TypeAten
MOID0.040387 AU
Observations Used69
Oppositions1
Arc Total2004-2004
First Observation Used2004-03-15
Last Observation Used2004-03-25
Observations (71)
Date Type RA Dec Mag Band Observatory
2004-03-15 06:53:53 C 11 25 51.94 +12 40 56.8 19.4 c 704
2004-03-15 07:09:44 C 11 25 43.06 +12 40 13.0 19.7 c 704
2004-03-15 07:25:31 C 11 25 34.00 +12 39 30.0 19.3 c 704
2004-03-15 07:41:27 C 11 25 24.94 +12 38 46.6 19.8 c 704
2004-03-16 06:40:07 C 11 13 13.92 +11 33 56.8 19.2 c 704
2004-03-16 06:40:15 C 11 13 13.85 +11 33 56.4 19.3 c 704
2004-03-16 06:40:54 C 11 13 13.40 +11 33 55.2 19.1 c 704
2004-03-16 06:56:44 C 11 13 04.28 +11 33 08.7 19.1 c 704
2004-03-16 06:56:52 C 11 13 04.24 +11 33 08.4 19.3 c 704
2004-03-16 06:57:00 C 11 13 04.12 +11 33 07.7 19.2 c 704
2004-03-16 07:13:25 C 11 12 54.50 +11 32 19.9 19.4 c 704
2004-03-16 07:13:57 C 11 12 54.27 +11 32 17.9 19.2 c 704
2004-03-16 07:14:06 C 11 12 54.30 +11 32 18.0 19.3 c 704
2004-03-16 07:29:36 C 11 12 45.25 +11 31 31.9 19.2 c 704
2004-03-16 07:30:19 C 11 12 44.82 +11 31 30.0 19.8 c 704
2004-03-16 07:30:28 C 11 12 44.80 +11 31 30.0 19.4 c 704
2004-03-16 07:45:48 C 11 12 35.80 +11 30 44.1 19.4 c 704
2004-03-16 07:46:37 C 11 12 35.37 +11 30 41.9 19.3 c 704
2004-03-16 07:46:46 C 11 12 35.26 +11 30 41.4 19.1 c 704
2004-03-16 23:43:16 C 11 04 00.78 +10 42 22.0 – r J95
2004-03-16 23:54:25 C 11 03 54.38 +10 41 47.2 – r J95
2004-03-17 00:03:44 C 11 03 46.94 +10 41 25.1 – c 246
2004-03-17 00:04:12 C 11 03 46.71 +10 41 22.9 – c 246
2004-03-17 00:05:09 C 11 03 46.15 +10 41 20.7 – c 246
2004-03-17 00:05:40 C 11 03 46.06 +10 41 20.3 – c 246
2004-03-17 00:06:13 C 11 03 45.58 +10 41 16.7 – c 246
2004-03-17 05:24:44 C 11 00 58.17 +10 25 39.7 18.6 c 704
2004-03-17 05:41:49 C 11 00 48.26 +10 24 47.8 19.0 c 704
2004-03-17 06:00:12 C 11 00 37.46 +10 23 52.8 19.2 c 704
2004-03-17 06:08:07 C 11 00 32.83 +10 23 26.8 18.9 c 704
2004-03-17 06:17:47 C 11 00 27.11 +10 22 57.5 19.1 c 704
2004-03-17 06:24:29 C 11 00 23.25 +10 22 35.9 19.0 c 704
2004-03-17 06:34:23 C 11 00 17.37 +10 22 06.6 19.1 c 704
2004-03-17 06:40:50 C 11 00 13.58 +10 21 45.8 18.8 c 704
2004-03-17 06:47:09 C 11 00 09.59 +10 21 29.0 – o H06
2004-03-17 06:50:03 C 11 00 07.90 +10 21 21.5 – o H06
2004-03-17 06:52:58 C 11 00 06.25 +10 21 12.6 – o H06
2004-03-17 06:57:16 C 11 00 03.89 +10 20 54.9 18.8 c 704
2004-03-17 07:13:28 C 10 59 54.49 +10 20 04.7 19.1 c 704
2004-03-17 21:18:22 C 10 52 18.78 +09 35 03.6 – r J95
2004-03-17 21:34:10 C 10 52 09.70 +09 34 15.6 – r J95
2004-03-17 21:47:39 C 10 52 00.05 +09 33 39.7 – c 246
2004-03-17 21:48:55 C 10 51 59.27 +09 33 35.4 – c 246
2004-03-17 21:49:22 C 10 51 59.09 +09 33 34.4 – c 246
2004-03-17 21:51:24 C 10 51 57.94 +09 33 28.3 – c 246
2004-03-17 22:06:11 C 10 51 51.17 +09 32 32.2 – r J95
2004-03-18 05:21:04 C 10 47 53.27 +09 10 03.5 19.5 c 704
2004-03-18 05:36:55 C 10 47 43.88 +09 09 12.0 19.6 c 704
2004-03-18 05:52:55 C 10 47 34.48 +09 08 21.5 19.6 c 704
2004-03-18 06:09:02 C 10 47 24.97 +09 07 29.5 19.5 c 704