AstDyS

AstDyS-2

Asteroids - Dynamic Site

AstDyS ∴ Objects ∴ 1981ER4 ∴ Orbital info ∴ Epoch epochXXX

(20975) 1981ER4 ▹

ORBITAL INFORMATION

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(ASCII data file 20975.eq1)

Keplerian elements at epoch
60400.0 MJD
	Value	1-σ variation	Units
a	2.94202	1.274e-08	au
e	0.119006	2.998e-08
i	10.058	3.75e-06	deg
Ω	211.433	1.936e-05	deg
ω	244.119	2.663e-05	deg
M	255.475	1.748e-05	deg

Other useful info
Absolute Magnitude (H)	13.8	mag
Slope parameter (G)	0.15	mag
Perihelion	2.5919	au
Aphelion	3.2921	au
Asc. node-Earth separation	2.05424	au
Desc. node-Earth separation	1.76336	au
Earth MOID	1.62772	au
Orbital period	1843.17	days
Date of orbit computation	apr 23 19:50

Correlation matrix
1.00000000	0.14354362	0.01360176	-0.00582466	0.01766764	-0.22043121
0.14354362	1.00000000	-0.01854211	-0.00691388	-0.02179722	-0.01797687
0.01360176	-0.01854211	1.00000000	-0.08961651	0.05161843	0.01548515
-0.00582466	-0.00691388	-0.08961651	1.00000000	-0.71668379	0.00228751
0.01766764	-0.02179722	0.05161843	-0.71668379	1.00000000	-0.67752417
-0.22043121	-0.01797687	0.01548515	0.00228751	-0.67752417	1.00000000

Covariance matrix
1.62286049E-16	5.48174806E-17	6.49746003E-16	-1.43629471E-15	5.99344987E-15	-4.90837705E-14
5.48174806E-17	8.98647117E-16	-2.08430719E-15	-4.01188290E-15	-1.74001761E-14	-9.41961213E-15
6.49746003E-16	-2.08430719E-15	1.40609896E-11	-6.50471229E-12	5.15431089E-12	1.01495700E-12
-1.43629471E-15	-4.01188290E-15	-6.50471229E-12	3.74683230E-10	-3.69417577E-10	7.73962998E-13
5.99344987E-15	-1.74001761E-14	5.15431089E-12	-3.69417577E-10	7.09113406E-10	-3.15360195E-10
-4.90837705E-14	-9.41961213E-15	1.01495700E-12	7.73962998E-13	-3.15360195E-10	3.05526205E-10