2021 ER4

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4596033707 ± 1.50e-04
Semi-major axis (a)0.8636623249 AU ± 7.14e-06
Inclination (i)1.95664036° ± 9.13e-04
Long. of Asc. Node (Ω)353.96659613° ± 4.57e-04
Arg. of Perihelion (ω)43.47319775° ± 1.79e-03
Mean Anomaly (M)31.54950570° ± 4.51e-02
Mean Motion (n)1.2279941945°/day ± 1.52e-05
Perihelion dist (q)0.46672021 AU ± 1.30e-04
Aphelion dist (Q)1.26060444 AU ± 1.30e-04
Orbital Period0.80263106 yr ± 9.96e-06
Physical Parameters
H (abs. magnitude)27.12
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.206″
Uncertainty2
Orbit TypeAten
MOID0.002007 AU
Observations Used19
Oppositions1
Arc Total2021-2021
First Observation Used2021-03-15
Last Observation Used2021-03-18
Observations (19)
Date Type RA Dec Mag Band Observatory
2021-03-15 05:45:01 C 09 32 37.661 +15 01 35.20 U F51
2021-03-15 06:01:47 C 09 32 39.695 +15 00 38.63 U F51
2021-03-15 06:18:30 C 09 32 41.657 +14 59 42.20 U F51
2021-03-15 10:09:23 C 09 32 57.82 +14 45 09.6 o 291
2021-03-15 10:12:42 C 09 32 58.32 +14 44 57.7 o 291
2021-03-15 10:16:02 C 09 32 58.83 +14 44 45.9 o 291
2021-03-15 20:31:04 C 09 35 01.199 +14 14 59.41 V J04
2021-03-15 20:31:15 C 09 34 54.43 +14 13 58.1 V 204
2021-03-15 20:40:06 C 09 35 02.004 +14 14 36.03 V J04
2021-03-15 20:49:09 C 09 35 02.793 +14 14 12.48 V J04
2021-03-15 21:06:25 C 09 34 57.58 +14 12 24.5 V 204
2021-03-15 21:43:53 C 09 34 59.85 +14 10 46.6 V L01
2021-03-15 21:48:23 C 09 35 00.25 +14 10 34.8 V L01
2021-03-15 21:52:53 C 09 35 00.63 +14 10 22.9 V L01
2021-03-15 21:57:22 C 09 35 01.06 +14 10 10.4 V L01
2021-03-15 22:05:51 C 09 35 01.78 +14 09 47.7 V L01
2021-03-18 03:45:32 C 09 40 23.65 +12 33 40.9 o 691
2021-03-18 04:09:52 C 09 40 24.32 +12 33 11.9 o 691
2021-03-18 04:34:13 C 09 40 24.97 +12 32 42.8 o 691