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48400 (1981 EZ21)
Classification: Main-belt Asteroid          SPK-ID: 2048400
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04100414520262943 3.5992e-08  
a 2.839002393653322 1.5526e-08 au
q 2.722591527273349 1.0278e-07 au
i 1.539395796853478 4.3645e-06 deg
node 204.1479378953076 0.00014934 deg
peri 58.62072655557797 0.00015851 deg
M 350.2904034370827 5.3357e-05 deg
tp 2459047.624390846334
(2020-Jul-17.12439085)
0.00025897 TDB
period 1747.217878183713
4.78
1.4332e-05
3.924e-08
d
yr
n .2060418477255001 1.6902e-09 deg/d
Q 2.955413260033296 1.6162e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1190  
   data-arc span      14373 days (39.35 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51238  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 21:48:28  

Additional Information
 Earth MOID = 1.70734 au 
 Jupiter MOID = 2.05748 au 
 T_jup = 3.308 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.6   n/a MPO474362  
diameter diameter 3.327 km 0.535 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.277   0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

48400 (1981 EZ21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EZ21 = 1997 TJ16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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