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4240 Grun (1981 EY20)
Classification: Main-belt Asteroid          SPK-ID: 2004240
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1059019392060633 4.3805e-08  
a 2.939433540981736 1.2627e-08 au
q 2.628141828824424 1.2827e-07 au
i 1.142367461344754 4.77e-06 deg
node 320.8553941854161 0.00017469 deg
peri 23.61405154158665 0.00017538 deg
M 157.0366354185392 1.6662e-05 deg
tp 2458397.542838214519
(2018-Oct-06.04283821)
8.4024e-05 TDB
period 1840.746125719955
5.04
1.1861e-05
3.247e-08
d
yr
n .1955728685068922 1.2602e-09 deg/d
Q 3.250725253139047 1.3965e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2112  
   data-arc span      24199 days (66.25 yr)  
   first obs. used      1954-12-22  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50324  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:29:54  

Additional Information
 Earth MOID = 1.61872 au 
 Jupiter MOID = 2.12435 au 
 T_jup = 3.265 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.56   n/a MPCxxxxx  

4240 Grun (1981 EY20)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 EY20 = 1948 TX1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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