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
2004-03-18 06:25:00 C 10 47 15.51 +09 06 37.7 19.6 c 704
2004-03-19 05:19:49 C 10 34 45.59 +07 51 14.0 19.0 c 704
2004-03-19 05:35:26 C 10 34 36.36 +07 50 22.1 19.3 c 704
2004-03-19 05:50:56 C 10 34 27.29 +07 49 29.6 19.0 c 704
2004-03-19 06:06:33 C 10 34 18.04 +07 48 37.6 19.3 c 704
2004-03-19 06:22:03 C 10 34 08.96 +07 47 45.3 19.1 c 704
2004-03-19 06:41:17 C 10 33 55.93 +07 46 27.0 r 649
2004-03-19 06:43:01 C 10 33 54.94 +07 46 21.4 r 649
2004-03-19 06:44:47 C 10 33 53.88 +07 46 15.4 r 649
2004-03-20 23:22:19 C 10 11 59.82 +05 27 44.8 r J95
2004-03-20 23:31:11 C 10 11 54.85 +05 27 14.3 r J95
2004-03-20 23:40:15 C 10 11 49.73 +05 26 43.4 r J95
2004-03-21 06:22:17 C 10 08 14.74 +05 04 11.0 r H36
2004-03-22 05:15:19 C 09 56 22.09 +03 46 03.9 c 926
2004-03-22 05:16:09 C 09 56 21.60 +03 46 00.3 c 926
2004-03-22 05:17:05 C 09 56 21.08 +03 45 57.6 c 926
2004-03-22 21:54:55 C 09 47 52.51 +02 48 33.5 r J95
2004-03-22 22:17:38 C 09 47 40.31 +02 47 16.6 r J95
2004-03-22 22:30:54 C 09 47 33.21 +02 46 31.5 r J95
2004-03-25 22:39:22 C 09 13 24.60 -01 07 55.3 r J95
2004-03-25 22:52:58 C 09 13 18.09 -01 08 35.3 r J95